Electrical Engineering Job

Interview Questions And Answers

Interview Questions Answers

https://interviewquestionsanswers.org/
 About Interview Questions Answers

Interview Questions Answers . ORG is an interview preparation guide of thousands of Job

Interview Questions And Answers, Job Interviews are always stressful even for job seekers who have
gone on countless interviews. The best way to reduce the stress is to be prepared for your job
interview. Take the time to review the standard interview questions you will most likely be asked.
These interview questions and answers on Electrical Engineering will help you strengthen your
technical skills, prepare for the interviews and quickly revise the concepts.

If you find any question or answer is incorrect or incomplete then you can submit your question or
answer directly with out any registration or login at our website. You just need to visit Electrical
Engineering Interview Questions And Answers to add your answer click on the Submit Your Answer
links on the website; with each question to post your answer, if you want to ask any question then you
will have a link Submit Your Question; that's will add your question in Electrical Engineering
category. To ensure quality, each submission is checked by our team, before it becomes live. This
Electrical Engineering Interview preparation PDF was generated at Saturday 6th February, 2021

You can follow us on FaceBook for latest Jobs, Updates and other interviews material.
www.facebook.com/InterviewQuestionsAnswers.Org

Follow us on Twitter for latest Jobs and interview preparation guides.

https://twitter.com/InterviewQA

If you need any further assistance or have queries regarding this document or its material or any of
other inquiry, please do not hesitate to contact us.

Best Of Luck.

Interview Questions Answers.ORG Team

https://InterviewQuestionsAnswers.ORG/
Support@InterviewQuestionsAnswers.ORG
 Electrical Engineering Interview Questions And Answers
In
te

Electrical Engineering Interview Questions And Answers

rv

Guide.
ie
w
Q
ue

Question - 1:
In a star connected three phase transformer the
Ans:
st

* a) Three phases are connected together at the start point

* b) Three phases are separate
* c) Neutral conductor is connected to a single phase
io

* d) Neutral conductor is electrically separated

Answer - a
View All Answers
ns

Question - 2:
A single-phase double-wound transformer consists of
Ans:
A

* a) A single core mounted winding

* b) A winding that carries the difference between IP and IS
ns

* c) A single solid core

* d) Two electrically separated coils
Answer - d
View All Answers
w

Question - 3:
er

One method of insulating windings is to use

Ans:
s.

* a) Shelac
* b) High reluctance silicon steel
* c) Low frequency dust cores
* d) PVC
O

Answer - a
View All Answers
R

Question - 4:
G

The usual method of insulating core laminations is

Ans:
* a) Low reluctance silicon steel
* b) Surface oxidization
* c) High frequency air cores
* d) Cellulose paper
Answer - b
View All Answers

Question - 5:
If a motor is required to start against a large starting current, it is usual to use
Ans:
* a) Direct on line starter
* b) Face plate starter
* c) Step down centre tapped starter
* d) Rotor resistance starter
Copyright © https://InterviewQuestionsAnswers.org Page 3/20
 Electrical Engineering Interview Questions And Answers

Answer - d
View All Answers

Question - 6:
In

In a shunt-wound motor the field coil is connected in

Ans:
te

* a) Series with the armature

* b) Series with the motor
* c) parallel with the armature
rv

* d) parallel with the motor

Answer - c
View All Answers
ie

Question - 7:
w

When the field windings of an electrical machine are not connected to its own armature, it is known as
Ans:
* a) Self- excited
Q

* b) Polyphase
* c) Separately-excited
* d) Synchronous
ue

Answer - c
View All Answers

Question - 8:
st

With a star-delta starter, the windings are brought out to a terminal box. The voltage applied to the windings at starting is
Ans:
io

* a) VL ÷ v3
* b) VL x v3
* c) VPhase ÷ v3
ns

* d) VPhase x v3
Answer - a
View All Answers
A

Question - 9:
Particular starting arrangements are used when a motor has a rating greater than
ns

Ans:
* a) 370 microwatts
* b) 0.37 watts
* c) 37 watts
w

* d) 370 watts
Answer - d
View All Answers
er

Question - 10:
s.

An isolator built into a panel is used for

Ans:
O

* a) Normal load switching

* b) Fault load switching
* c) Short circuit protection
R

* d) No load switching
Answer - d
G
View All Answers

Question - 11:
A device with a BS EN number has been
Ans:
* a) Agreed for use only within the UK
* b) Agreed for operational use within the EU
* c) Standardized for all operational uses only in the UK
* d) Standardized for use in the EU
Answer - d
View All Answers

Question - 12:
Q8 BS 7671 provides appropriate advice on
Ans:

Copyright © https://InterviewQuestionsAnswers.org Page 4/20

 Electrical Engineering Interview Questions And Answers

* a) Heights of panels
* b) Design of panels
* c) Environmental conditions
* d) Instrumentation
Answer - c
In

View All Answers

te

Question - 13:
What degree of protection is specified for protection against a BS finger?
rv

Ans:
* a) IP4XB
* b) IP5XB
* c) IP6XB
ie

* d) IPXXB
Answer - d
w

View All Answers

Question - 14:
Q

Which of the following is statutory?

Ans:
ue

* a) BS 7671
* b) On-Site Guide
* c) Electricity at Work Regulations
* d) GS 38
Answer - c
st

View All Answers

io

Question - 15:
Which of the following are appropriate tests for a completed panel?
ns

Ans:
* a) Flash testing of components
* b) Insulation resistance and polarity
* c) Inspection of conductors for current carrying capacity
* d) Identification of conductors
A

Answer - b
View All Answers
ns

Question - 16:
The purpose of a switch is to open or close a circuit
w

Ans:
* a) In the event of a fault current
* b) Under load conditions
er

* c) Under overload conditions

* d) Automatically after a fault has been repaired
Answer - b
s.

View All Answers

Question - 17:
O

A common type of cable termination used for ribbon cables in panel building is
Ans:
R

* a) Pin
* b) Lug
G

* c) Insulation displacement
* d) Screw
Answer - c
View All Answers

Question - 18:
A moving coil meter is not used on an ac circuit because
Ans:
* a) It cannot read very small variations
* b) The direction of the deflection depends upon the direction of the current
* c) It is non linear
* d) It does not use the damping effect
Answer - b
View All Answers

Question - 19:
Copyright © https://InterviewQuestionsAnswers.org Page 5/20
 Electrical Engineering Interview Questions And Answers

To ensure safe isolation, voltage indicating devices

Ans:
* a) Must comply with BS 7671
* b) Are used to prove the circuit dead only
In

* c) Are used to prove the circuit was alive only

* d) Must be "proved" prior to and "re-proved" after isolation
Answer - d
te

View All Answers

rv

Question - 20:
Which of the following is not a factor, which would affect the type of termination?
Ans:
ie

* a) Circuit design current

* b) Physical space around terminations
* c) Presence of solid foreign bodies
w

* d) Size of conductor
Answer - c
View All Answers
Q

Question - 21:
ue

Which of the following has an adverse effect on installed equipment?

Ans:
* a) Eddy current damping
* b) Air damping
st

* c) Ambient temperature
* d) Operating temperature
Answer - c
io

View All Answers

ns

Question - 22:
The purpose of a visual inspection is to ensure compliance with BS 7671, Section
Ans:
* a) 601
A

* b) 712
* c) 413
* d) 314
ns

Answer - b
View All Answers
w

Question - 23:
The purpose of a method statement is to
er

Ans:
* a) Ensure compliance with BS 7671
* b) Identify a safe working practice
s.

* c) Provide a training document for staff

* d) Provide instructions to be followed at all times
Answer - b
O

View All Answers

Question - 24:
R

Electrostatic sensitive equipment, in transit, need not be protected against damage from
G

Ans:
* a) High temperature
* b) Dust and fibers
* c) Moisture ingress
* d) Day light
Answer - d
View All Answers

Question - 25:
To facilitate ease of installation and assembly of equipment reference is made to
Ans:
* a) BS 7430
* b) Manufacturer's catalogues
* c) GS 38
* d) Data charts
Answer - d

Copyright © https://InterviewQuestionsAnswers.org Page 6/20

 Electrical Engineering Interview Questions And Answers

View All Answers

Question - 26:
In

When a voltmeter is connected in a circuit it is essential that it

Ans:
* a) Has a very low resistance
te

* b) Has a very high resistance

* c) Is connected in series with the supply
* d) Is connected in series with the load
rv

Answer - b
View All Answers
ie

Question - 27:
When an ammeter is connected in a circuit it is essential that it
w

Ans:
* a) Has a very low resistance
* b) Has a very high resistance
Q

* c) Is connected across the supply

* d) Is connected across the load
Answer - a
ue

View All Answers

Question - 28:
st

Which of the following has an impact upon earthing?

Ans:
* a) BS EN 60439-01
io

* b) BS 4491
* c) BS 4444
* d) BS EN 60898
ns

Answer - c
View All Answers

Question - 29:
A

Which of the following is a statutory piece of legislation?

Ans:
ns

* a) BS 7671
* b) IEE Guidance Notes
* c) Electricity at Work Regulations
* d) IEE On-Site Guide
w

Answer - c
View All Answers
er

Question - 30:
Which of the following lamps would not normally form part of a highway electrical system?
s.

Ans:
* a) Low pressure mercury (T8-T12)
O

* b) Low pressure mercury (MBF)

* c) Metal halide (MBI)
* d) Incandescent Lamp (100W)
R

Answer - d
View All Answers
G

Question - 31:
Which legislation states the need to avoid live working unless unreasonable in all circumstances?
Ans:
* a) BS 7671
* b) Guidance Notes 3
* c) On-Site Guide
* d) The Electricity at Work Regulations
Answer - d
View All Answers

Question - 32:
To facilitate safe isolation, voltage indicating devices
Ans:
* a) Must comply with BS 7671

Copyright © https://InterviewQuestionsAnswers.org Page 7/20

 Electrical Engineering Interview Questions And Answers

* b) Are used to prove the circuit was dead only

* c) Are used to prove the circuit was alive only
* d) Are "proved" prior to and "re-proved" after isolation
Answer - d
In

View All Answers

Question - 33:
te

Instruments should be regularly calibrated to

Ans:
rv

* a) Support local industry

* b) Ensure accuracy when testing
* c) Ensure operative is up to date
* d) Provide a training exercise for operatives
ie

Answer - b
View All Answers
w

Question - 34:
Relevant information for re commissioning street furniture can be found in
Q

Ans:
* a) IEE Guidance Notes 7
ue

* b) Works instructions
* c) The Electricity Supply Regulations
* d) The Petroleum (Consolidation) Act 1928
Answer - b
st

View All Answers

Question - 35:
io

Voltage indication devices need to be proved to ensure

Ans:
ns

* a) That the lamp has not gone

* b) That the highway furniture has been installed correctly
* c) Safe working conditions
* d) The correct operation of street furniture
Answer - c
A

View All Answers

ns

Question - 36:
It is necessary to avoid skin contact with quartz lamps, as it
Ans:
w

* a) Reduces the life of the lamp

* b) Could cause burns
* c) Generates excessive heat
er

* d) Lengthens lampworking life

Answer - a
View All Answers
s.

Question - 37:
O

Which of the following is a statutory document applicable to operatives carrying out installation and maintenance of highway electrical equipment?
Ans:
R

* a) The Laying of Cables in Public Highways

* b) H.S.E guidance H.S.G 47 (Avoiding danger from underground and overhead services)
* c) The Personal Protective Equipment at Work Regulations
G

* d) Electricity Association G39/1

Answer - c
View All Answers

Question - 38:
Which of the following is a non-statutory document?
Ans:
* a) The New Roads and Street Works Act
* b) The Electricity Safety, Quality, and Continuity Regulations 2002
* c) BS 7671
* d) The Electrical Equipment (Safety) Regulations
Answer - c
View All Answers

Question - 39:

Copyright © https://InterviewQuestionsAnswers.org Page 8/20

 Electrical Engineering Interview Questions And Answers

Which of the following normally form part of a highway electrical system?

Ans:
* a) Current transformers and photoelectrical control units
* b) Voltage transformers and RCD's
In

* c) Igniters and transformers

* d) Power factor meter and isolators
Answer - c
te

View All Answers

rv

Question - 40:
Low-pressure mercury- vapor lamps should be disposed of by
Ans:
ie

* a) Throwing in a skip
* b) Putting in a glass recycle point (clear glass only)
* c) Using a suitable lamp crusher
w

* d) Putting in the refuse bins, which are collected weekly?

Answer - c
View All Answers
Q

Question - 41:
ue

When carrying out maintenance work on a distribution board in a busy walkway, it is advisable to protect others by the use of a
Ans:
* a) Warning sign
* b) Safety barrier
st

* c) Temporary bollard
* d) Audible warning device
Answer - b
io

View All Answers

ns

Question - 42:
In order to understand the operating procedure for a particular item of equipment, the best source of information would be the
Ans:
* a) Company sales representative
A

* b) Manufacturers' manual
* c) Manufacturers' catalogue
* d) Circuit diagram
ns

Answer - b
View All Answers
w

Question - 43:
Guidance on regular inspection and testing of portable appliances can be found in
er

Ans:
* a) BS 7671 Requirements for Electrical Installation
* b) IEE Guidance Note 3 Inspection and testing
s.

* c) IEE Code of Practice for In-Service Inspection and Testing of Electrical Equipment
* d) IEE on Site Guide
Answer - c
O

View All Answers

Question - 44:
R

Certain discharge luminaries mounted above rotating machine can give the appearance that the machine is at a standstill. This effect is known as
G

Ans:
* a) Stroboscopic effect
* b) Robotic effect
* c) Rotor effect
* d) Telescopic effect
Answer - a
View All Answers

Question - 45:
Once a low-pressure mercury vapour lamp has lit, the purpose of the choke/ballast unit is to
Ans:
* a) Discharge voltage
* b) Correct power factor
* c) Suppress radio interference
* d) Limit lamp current
Answer - d

Copyright © https://InterviewQuestionsAnswers.org Page 9/20

 Electrical Engineering Interview Questions And Answers

View All Answers

Question - 46:
In

Balancing loads over three phases will reduce

Ans:
* a) Phase currents
te

* b) Earth faults
* c) Neutral currents
* d) Overloads
rv

Answer - c
View All Answers
ie

Question - 47:
In order to facilitate maintenance of a complex electrical system, the sequence of control for isolation can be best shown using a
w

Ans:
* a) Block diagram
* b) Layout drawing
Q

* c) Circuit diagram
* d) Bar chart
Answer - a
ue

View All Answers

Question - 48:
st

In order to prevent danger during maintenance operations, a voltage warning notice is required on all electrical accessories where
Ans:
* a) Voltage is present
io

* b) The voltage exceeds 230V and such voltage would not be expected
* c) The voltage exceeds 400V
* d) The voltage is below 230V
ns

Answer - b
View All Answers

Question - 49:
A

The Electricity at Work Regulations state that electrical equipment must be maintained to prevent danger. Electrical equipment is defined as all small items of
battery-powered equipment up to and including overhead power lines rated at
ns

Ans:
* a) 230V
* b) 400V
* c) 33kV
w

* d) 400kV
Answer - d
View All Answers
er

Question - 50:
s.

The four electrical tests that should be carried out on a new ring final circuit before it is energized are
Ans:
O

* a) Continuity of protective conductors, continuity of ring final circuits, insulation, - resistance and polarity
* b) Continuity of ring final circuits, insulation resistance, polarity, and earth fault loop - impedance
* c) Insulation resistance, polarity, earth fault loop impedance and continuity of protective - conductors
R

* d) Polarity, earth fault loop-impedance, continuity of protective conductors and Continuity of ring final circuits
Answer - a
G
View All Answers

Question - 51:
A 50 mm x 50 mm steel trunking has a tabulated space factor of 1037. If the tabulated factor for PVC cable having a cross sectional area of 6 mm2 is 21.2, the
maximum number of these cables that can be installed into the trunking is
Ans:
* a) 47
* b) 48
* c) 49
* d) 50
Answer - b
View All Answers

Question - 52:
The most suitable item of equipment to mark a straight line in order to install a horizontal conduit over a distance of 4 m is a
Ans:
Copyright © https://InterviewQuestionsAnswers.org Page 10/20
 Electrical Engineering Interview Questions And Answers

* a) Plumb line
* b) Spirit level
* c) Steel tape
* d) Chalk line
Answer - d
In

View All Answers

te

Question - 53:
A residual current device will disconnect under
rv

Ans:
* a) short circuit conditions only
* b) Both earth fault and short circuit conditions
* c) Earth fault conditions only
ie

* d) Overload conditions only

Answer - c
w

View All Answers

Question - 54:
Q

An earthing arrangement that has a PEN conductor is

Ans:
ue

* a) TN-C-S
* b) TN-S
* c) TT
* d) IT
Answer - a
st

View All Answers

io

Question - 55:
A non-maintained emergency light is classified as NM3. This means that the luminary will illuminate during
ns

Ans:
* a) Normal conditions then automatically switch off after three hours
* b) Any power failure for up to three hours
* c) Both normal and power failure conditions then automatically switch off after three hours
* d) Power failures that last longer than three hours but not shorter than three hours
A

Answer - b
View All Answers
ns

Question - 56:
A circuit wired in 1.5 mm2 thermoplastic (PVC) twin with CPC cable is protected by a 16 A device and is used to supply a 230 V 3 kW water heater. If the cable has
a rated voltage drop of 29 mV/A/m and the circuit is 24 m long, the actual voltage drop will be
w

Ans:
* a) 2.08V
er

* b) 9.07V
* c) 11.14V
* d) 69V
s.

Answer - b
View All Answers
O

Question - 57:
The maximum operating temperature for a thermoplastic (pace) insulated cable with copper conductors is
R

Ans:
* a) 60 OC
G

* b) 70 OC
* c) 105 OC
* d) 160 OC
Answer - b
View All Answers

Question - 58:
For a drawing having a scale of 1:50, a wall 10 m long would be drawn to a length of
Ans:
* a) 10 mm
* b) 20 cm
* c) 50 cm
* d) 10050 mm
Answer - b
View All Answers

Copyright © https://InterviewQuestionsAnswers.org Page 11/20

 Electrical Engineering Interview Questions And Answers

Question - 59:
Which of the following is a non-statutory regulation?
Ans:
In

* a) Electricity at Work Regulations

* b) Health and Safety at Work Act
* c) Electricity Safety, Quality, and Continuity Regulations
* d) BS 7671- Requirements for Electrical Installations
te

Answer - d
View All Answers
rv

Question - 60:
If a circuit protective device requires 200 A in order to disconnect in the required time, the overall impedance of the earth fault path for a 230 V circuit protected by
ie

the device must not exceed

Ans:
w

* a) 0.86 O
* b) 1.15 O
* c) 2.15 O
* d) 2.30 O
Q

Answer - b
View All Answers
ue

Question - 61:
Which of the following is a transmission voltage?
Ans:
st

* a) 400 kV
* b) 33 kV
* c) 400 V
io

* d) 230 V
Answer - a
ns
View All Answers

Question - 62:
The ratio of the true power to apparent power in an ac circuit is the
A

Ans:
* a) Power consumption
* b) Harmonic current
ns

* c) Power factor
* d) Reactive power
Answer - c
View All Answers
w

Question - 63:
er

In order to determine the amount of accessories required for a particular contract, the best method would be to use the layout drawings and a
Ans:
s.

* a) Site diary
* b) Take off sheet
* c) Day work sheet
O

* d) Time sheet
Answer - b
View All Answers
R

Question - 64:
G

In order to prove safe isolation of an electrical circuit, it is essential to use

Ans:
* a) A multi-meter
* b) An insulation resistance tester
* c) An approved voltage indicator
* d) A low reading ohmmeter
Answer - c
View All Answers

Question - 65:
A suitable means of recording the number of visitors on a large construction site is by the use of a
Ans:
* a) Day work sheet
* b) Timesheet
* c) Take off sheet

Copyright © https://InterviewQuestionsAnswers.org Page 12/20

 Electrical Engineering Interview Questions And Answers

* d) Visitors book
Answer - d
View All Answers
In

Question - 66:
On a large construction site, inductions are carried out for new members of staff in order to inform them of the
te

Ans:
* a) Location of the canteen
* b) Requirements within BS 7671
rv

* c) Fire safety procedure

* d) Location of the nearest wholesaler
Answer - d
ie

View All Answers

Question - 67:
w

Before any work is done within an electrical installation, the first procedure would be to
Ans:
Q

* a) Carry out a risk assessment

* b) Turn off the main switch
* c) Remove all components
ue

* d) Install temporary supplies

Answer - c
View All Answers
st

Question - 68:
The order in which they should be carried out is
io

Ans:
* a) 1, 3, 2, 4, 5
* b) 1, 2, 3, 4, 5
ns

* c) 2, 1, 4, 3, 5
* d) 2, 3, 1, 4, 5
Answer - a
View All Answers
A

Question - 69:
The five main stages of the risk assessment procedure are:
ns

Ans:
* a) Identify
* b) Evaluate
w

* c) Record
* d) Implement
* e) Review
er

Answer - b
View All Answers
s.

Question - 70:
A particular extension lead used on a construction site is colored yellow to
O

Ans:
* a) Indicate its mechanical stress properties
R

* b) Enable it to be seen in the dark

* c) Indicate the supply voltage to it
* d) Enable it to be to be identified as suitable for site use
G

Answer - c
View All Answers

Question - 71:
A 110 V, centre-tapped earth, reduced low voltage supply for power tools provides a voltage of
Ans:
* a) 25 V between live conductors
* b) 55 V to earth
* c) 110 V to earth
* d) 12 V SELV
Answer - b
View All Answers

Question - 72:
The purpose of a bonding conductor is to provide

Copyright © https://InterviewQuestionsAnswers.org Page 13/20

 Electrical Engineering Interview Questions And Answers

Ans:
* a) An earth fault path
* b) An equal potential zone
* c) Short circuit protection
In

* d) Overload protection
Answer - b
View All Answers
te

Question - 73:
The white or grey PVC outer layer of a twin and CPC flat thermoplastic (PVC) cable is the
rv

Ans:
* a) conductor
ie

* b) Insulation
* c) Conductor
* d) Sheath
w

Answer - d
View All Answers
Q

Question - 74:
A mass of 20 kg is to be raised by a hoist 2 m in 30 seconds. Assuming no losses, the power required to raise this load is
ue

Ans:
* a) 13.08 Watts
* b) 196.2 Watts
* c) 392.4 Watts
st

* d) 1200 Watts
Answer - a
View All Answers
io

Question - 75:
Where P = V I. The value V can be determined using
ns

Ans:
* a) V = _I_P
* b) V = P I
* c) V = P - I
A

* d) V = _P_I
Answer - d
ns

View All Answers

Question - 76:
Four resistors having values of 2 O, 2 O, 5 O, and 20 O are connected in a parallel circuit arrangement. The total resistance of this circuit is
w

Ans:
* a) 0.8 O
er

* b) 1.25 O
* c) 29 O
* d) 400 O
s.

Answer - a
View All Answers
O

Question - 77:
An increase in current through a conductor will lead to
R

Ans:
* a) A decrease in conductor temperature
G

* b) A decrease in conductor resistance

* c) An increase in insulation resistance
* d) An increase in conductor temperature
Answer - d
View All Answers

Question - 78:
A single rotation of an alternator, intended to provide a 50 Hz supply frequency, will take
Ans:
* a) 2 ms
* b) 20 ms
* c) 50 ms
* d) 5000 ms
Answer - b
View All Answers

Copyright © https://InterviewQuestionsAnswers.org Page 14/20

 Electrical Engineering Interview Questions And Answers

Question - 79:
The Tesla is the unit of
Ans:
In

* a) Magnetic flux
* b) Molecular flux
* c) Magnetic flux density
* d) Molecular flux density
te

Answer - c
View All Answers
rv

Question - 80:
Using a scale of 1:50, a 10 mm measurement taken from a plan would be equal to an actual measurement of
ie

Ans:
* a) 5 mm
w

* b) 5 cm
* c) 0.5 m
* d) 5 m
Answer - c
Q

View All Answers

ue

Question - 81:
To ensure that a particular item of electro technical equipment meets a particular British Standard or BSEN Harmonized Standard, the best source of information
would be the
Ans:
st

* a) manufacturer of the equipment

* b) British Standards Institute
* c) Institute of Electrical Engineers
io

* d) Supplier of the equipment

Answer - a
ns
View All Answers

Question - 82:
An independent regulatory body responsible for monitoring standards of electrical installation contractors is the
A

Ans:
* a) Electrical Institute Council
* b) Institute of Electrical Engineers
ns

* c) National Electrical Contractors Institute Inspection Council

* d) National Inspection Council for Electrical Installation Contractors
Answer - d
View All Answers
w

Question - 83:
er

CO2 fire extinguishers are indicated by the color code

Ans:
s.

* a) Black
* b) Red
* c) Beige
O

* d) Blue
Answer - a
View All Answers
R

Question - 84:
G

The type of fire extinguisher, which would not be suitable for flammable liquids, is
Ans:
* a) Dry powder
* b) Water
* c) Carbon dioxide
* d) Foam
Answer - b
View All Answers

Question - 85:
First aid points are indicated using signs bearing a white cross on a
Ans:
* a) Yellow background
* b) Blue background
* c) Red background

Copyright © https://InterviewQuestionsAnswers.org Page 15/20

 Electrical Engineering Interview Questions And Answers

* d) Green background
Answer - d
View All Answers
In

Question - 86:
When carrying out repairs to the base of a street lighting column it is essential to wear
te

Ans:
* a) A safety harness
* b) High visibility clothes
rv

* c) Gauntlets
* d) High voltage clothing
Answer - b
ie

View All Answers

Question - 87:
w

Prior to using an electric saw on a construction site, a user check finds that the insulation on the supply flex is damaged. The correct procedure would be to
Ans:
Q

* a) Replace the cord with a new one

* b) Report the damage to a supervisor after use
* c) Repair the cord with insulation tape
ue

* d) Report the damage to a supervisor before use

Answer - d
View All Answers
st

Question - 88:
Which of the following documents is non-statutory?
io

Ans:
* a) Health and Safety at Work Act
* b) Electricity at Work Regulations
ns

* c) COSHH
* d) BS 7671- Requirements for Electrical Installations
Answer - d
View All Answers
A

Question - 89:
Draw the state diagram for a circuit that outputs?
ns

Ans:
Draw the state diagram for a circuit that outputs a "1" if the aggregate serial binary input is divisible by 5. For instance, if the input stream is 1, 0, 1, we output a "1"
(since 101 is 5). If we then get a "0", the aggregate total is 10, so we output another "1" (and so on).
w

We don't need to keep track of the entire string of numbers - if something is divisible by 5, it doesn't matter if it's 250 or 0, so we can just reset to 0. So we really only
need to keep track of "0" through "4".
View All Answers
er

Question - 90:
s.

Design a four-input NAND gate using only two-input NAND gates

Ans:
O

Basically, you can tie the inputs of a NAND gate together to get an inverter, so...
View All Answers
R

Question - 91:
Explain the differences between "Direct Mapped", "Fully Associative", and "Set Associative" caches
G

Ans:
If each block has only one place it can appear in the cache, the cache is said to be direct mapped. The mapping is usually (block-frame address) modulo (number of
blocks in cache).
If a block can be placed anywhere in the cache, the cache is said to be fully associative.
If a block can be placed in a restricted set of places in the cache, the cache is said to be set associative. A set is a group of two or more blocks in the cache. A block is
first mapped onto a set, and then the block can be placed anywhere within the set. The set is usually chosen by bit selection; that is, (block-frame address) modulo
(number of sets in cache). If there are n blocks in a set, the cache placement is called n-way set associative.
View All Answers

Question - 92:
Given the following FIFO and rules, how deep does the FIFO need to be to prevent underflowing or overflowing?
Ans:
Given the following FIFO and rules, how deep does the FIFO need to be to prevent underflowing or overflowing?
RULES:
1) frequency(clk_A) = frequency(clk_B) / 4

Copyright © https://InterviewQuestionsAnswers.org Page 16/20

 Electrical Engineering Interview Questions And Answers

2) period(en_B) = period(clk_A) * 100

3) duty_cycle(en_B) = 25%
Assume clk_B = 100MHz (10ns)
From (1), clk_A = 25MHz (40ns)
From (2), period(en_B) = 40ns * 400 = 4000ns, but we only output for 1000ns, due to (3), so 3000ns of the enable we are doing no output work.
In

Therefore, FIFO size = 3000ns/40ns = 75 entries.

View All Answers
te

Question - 93:
Write a function to output a diamond shape according to the given (odd) input?
rv

Ans:
Examples: Input is 5 Input is 7
<pre>
ie

* *
*** ***
***** *****
w

*** *******
* *****
***
*
Q

</pre>
### BEGIN PERL SNIPET ###
for ($i = 1; $i <= (($input * 2) - 1); $i += 2) {
ue

if ($i <= $input) {

$stars = $i;
$spaces = ($input - $stars) / 2;
while ($spaces--) { print " "; }
st

while ($stars--) { print "*"; }

} else {
$spaces = ($i - $input) / 2;
io

$stars = $input - ($spaces * 2);

while ($spaces--) { print " "; }
while ($stars--) { print "*"; }
}
ns

print "n";
}
### END PERL SNIPET ###
View All Answers
A

Question - 94:
ns

Write a function to determine whether a string is a palindrome (same forward as reverse, such as "radar" or "mom")
Ans:
/* BEGIN C SNIPET */
#include
w

void is_palindrome ( char *in_str ) {

char *tmp_str;
int i, length;
er

length = strlen ( *in_str );

for ( i = 0; i < length; i++ ) {
*tmp_str[length-i-1] = *in_str[i];
s.

}
if ( 0 == strcmp ( *tmp_str, *in_str ) ) printf ("String is a palindrome");
else printf ("String is not a palindrome");
O

}
/* END C SNIPET */
View All Answers
R

Question - 95:
G

In C, explain the difference between the & operator and the * operator?
Ans:
& is the address operator, and it creates pointer values.
* is the indirection operator, and it preferences pointers to access the object pointed to.
Example:
In the following example, the pointer ip is assigned the address of variable i (&i). After that assignment, the expression *ip refers to the same object denoted by i:
int i, j, *ip;
ip = &i;
i = 22;
j = *ip; /* j now has the value 22 */
*ip = 17; /* i now has the value 17 */
View All Answers

Question - 96:
Write the code for finding the factorial of a passed integer. Use a recursive subroutine?
Ans:
Copyright © https://InterviewQuestionsAnswers.org Page 17/20
 Electrical Engineering Interview Questions And Answers

// BEGIN PERL SNIPET

sub factorial {
my $y = shift;
if ( $y > 1 ) {
return $y * &factorial( $y - 1 );
In

} else {
return 1;
}
te

}
// END PERL SNIPET
View All Answers
rv

Question - 97:
Write the code to sort an array of integers?
ie

Ans:
/* BEGIN C SNIPET */
w

void bubblesort (int x[], int lim) {

int i, j, temp;
for (i = 0; i < lim; i++) {
for (j = 0; j < lim-1-i; j++) {
Q

if (x[j] > x[j+1]) {

temp = x[j];
x[j] = x[j+1];
ue

x[j+1] = temp;
} /* end if */
} /* end for j */
} /* end for i */
st

} /* end bubblesort */
/* END C SNIPET */
Some optimizations that can be made are that a single-element array does not need to be sorted; therefore, the "for i" loop only needs to go from 0 to lim-1. Next, if at
io

some point during the iterations, we go through the entire array WITHOUT performing a swap, the complete array has been sorted, and we do not need to continue.
We can watch for this by adding a variable to keep track of whether we have performed a swap on this iteration.
View All Answers
ns

Question - 98:
What is the difference between running the following snipet of code on Verilog vs Vera?
Ans:
A

What is the difference between running the following snipet of code on Verilog vs Vera?
fork {
ns

task_one();
#10;
task_one();
}
task task_one() {
w

cnt = 0;
for (i = 0; i < 50; i++) {
cnt++;
er

}
}
View All Answers
s.

Question - 99:
O

Using the given, draw the waveforms for the following versions of a?
Ans:
R

Using the given, draw the waveforms for the following versions of a (each version is separate, i.e. not in the same run):
reg clk;
reg a;
G

always #10 clk = ~clk;

(1) always @(clk) a = #5 clk;
(2) always @(clk) a = #10 clk;
(3) always @(clk) a = #15 clk;
Now, change a to wire, and draw for:
(4) assign #5 a = clk;
(5) assign #10 a = clk;
(6) assign #15 a = clk;
View All Answers

Question - 100:
What is the difference between:
c = foo ? a : b;
and
if (foo) c = a;
else c = b;
Ans:
Copyright © https://InterviewQuestionsAnswers.org Page 18/20
 Electrical Engineering Interview Questions And Answers

The ? merges answers if the condition is "x", so for instance if foo = 1'bx, a = 'b10, and b = 'b11, you'd get c = 'b1x.
On the other hand, if treats Xs or Zs as FALSE, so you'd always get c = b.
View All Answers
In

Question - 101:
What is the difference between the following two lines of Verilog code?
te

Ans:
What is the difference between the following two lines of Verilog code?
#5 a = b;
rv

a = #5 b;
#5 a = b; Wait five time units before doing the action for "a = b;".
The value assigned to a will be the value of b 5 time units hence.
a = #5 b; The value of b is calculated and stored in an internal temp register.
ie

After five time units, assign this stored value to a.

View All Answers
w

Question - 102:
Given the following snipet of Verilog code draw out the waveforms for clk?
Q

Ans:
Given the following snipet of Verilog code, draw out the waveforms for clk and a
ue

always @(clk) begin

a = 0;
#5 a = 1;
end
<pre>
st

10 30 50 70 90 110 130
___ ___ ___ ___ ___ ___ ___
clk ___| |___| |___| |___| |___| |___| |___| |___
io

a ___________________________________________________________
</pre>This obviously is not what we wanted, so to get closer, you could use
"always @ (posedge clk)" instead, and you'd get<pre>
ns

10 30 50 70 90 110 130
___ ___ ___ ___ ___ ___ ___
clk ___| |___| |___| |___| |___| |___| |___| |___
___ ___
a _______________________| |___________________| |_______
</pre>
A

View All Answers

ns

Question - 103:
Given the following Verilog code, what value of "a" is displayed?
Ans:
w

Given the following Verilog code, what value of "a" is displayed?

always @(clk) begin
er

a = 0;
a <= 1;
$display(a);
end
s.

This is a tricky one! Verilog scheduling semantics basically imply a four-level deep queue for the current simulation time:
1: Active Events (blocking statements)
2: Inactive Events (#0 delays, etc)
O

3: Non-Blocking Assign Updates (non-blocking statements)

4: Monitor Events ($display, $monitor, etc).
Since the "a = 0" is an active event, it is scheduled into the 1st "queue". The "a <= 1" is a non-blocking event, so it's placed into the 3rd queue. Finally, the display
R

statement is placed into the 4th queue.

Only events in the active queue are completed this sim cycle, so the "a = 0" happens, and then the display shows a = 0. If we were to look at the value of a in the next
sim cycle, it would show 1.
G

View All Answers

Question - 104:
What is the difference between a Verilog task and a Verilog function?
Ans:
The following rules distinguish tasks from functions:
A function shall execute in one simulation time unit;
a task can contain time-controlling statements.
A function cannot enable a task;
a task can enable other tasks or functions.
A function shall have at least one input type argument and shall not have an output or inout type argument;
a task can have zero or more arguments of any type.
A function shall return a single value; a task shall not return a value.
View All Answers

Copyright © https://InterviewQuestionsAnswers.org Page 19/20

 Engineering Most Popular & Related Interview Guides

1 : Mechanical Engineering Interview Questions and Answers.

2 : Civil Engineering Interview Questions and Answers.

3 : Automobile Engineering Interview Questions and Answers.

4 : Chemical Engineering Interview Questions and Answers.

5 : Marine Engineering Interview Questions and Answers.

6 : Production Engineer Interview Questions and Answers.

7 : RF Engineer Interview Questions and Answers.

8 : Energy Oil Gas Interview Questions and Answers.

9 : Electronics Communications Interview Questions and Answers.

10 : Aeronautical Engineering Interview Questions and Answers.

Follow us on FaceBook
www.facebook.com/InterviewQuestionsAnswers.Org

Follow us on Twitter
https://twitter.com/InterviewQA

For any inquiry please do not hesitate to contact us.

Interview Questions Answers.ORG Team

https://InterviewQuestionsAnswers.ORG/
support@InterviewQuestionsAnswers.ORG