Electrical Engineering Diploma Based 73 Important MCQ
Electrical Engineering Diploma Based 73 Important MCQ
Electrical Engineering Diploma Based 73 Important MCQ
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ELECTRICAL ENGINEERING DIPLOMA BASED 73 IMPORTANT MCQ PDF
1.The temperature, under thermal and electrical system analogy, is considered analogous to
(a) voltage
(b) current
(c) capacitance
(d) charge
(e) none of the above
Ans: a
Ans: d
3.In liquid level and electrical system analogy, voltage is considered analogous to
(a) head
(b) liquid flow
(c) liquid flow rate
(d) none of the above
Ans: a
Ans: b
Ans: a
Ans: d
Ans: c
8.In a stable control system backlash can cause which of the following ?
(a) Underdamping
(b) Overdamping
(c) Poor stability at reduced values of open loop gain
(d) Low-level oscillations
Ans: d
9.In an automatic control system which of the following elements is not used ?
(a) Error detector
(b) Final control element
(c) Sensor
(d) Oscillator
Ans: d
Ans: a
Ans: d
13.Which of the following devices are commonly used as error detectors in instruments ?
(a) Vernistats
(b) Microsyns
(c) Resolvers
(d) Any of the above
Ans: d
Ans: b
Ans: a
Ans: a
17.As a result of introduction of negative feedback which of the following will not decrease ?
(a) Band width
(b) Overall gain
(c) Distortion
(d) Instability
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Ans: a
Ans: d
Ans: a
Ans: b
Ans: a
Ans: d
Ans: c
Ans: c
25.On which of the following factors does the sensitivity of a closed loop system to gain
changes and
load disturbances depend ?
(a) Frequency
(b) Loop gain
(c) Forward gain
(d) All of the above
Ans: d
Ans: d
Ans: d
28.Which of the following statements is correct for any closed loop system ?
(a) All the co-efficients can have zero value
(6) All the co-efficients are always non-zero
(c) Only one of the static error co-efficients has a finite non-zero value
(d) None of the above
Ans: c
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29.Which of the following statements is correct for a system with gain margin close to unity or
a phase margin close to zero ?
(a) The system is relatively stable
(b) The system is highly stable
(c) The system is highly oscillatory
(d) None of the above
Ans: c
30.Due to which of the following reasons excessive bond width in control systems should be
avoided ?
(a) It leads to slow speed of response
(b) It leads to low relative stability
(c) Noise is proportional to band width
(d) None of the above
Ans: c
33.The ratio of resistance of a 100W, 220V lamp to that of 100W lamp will be nearly-
(a) 4
(b) 8
(c) 1/4
(d) 1/2
Answer: 4
34.If the length and cross section of piece of conductor are both doubted what be its
resistance(initial resistance R)?
(a) 4R
(b) 2R
(c) R
(d) 0.25R
Answer: 4R
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35. The number of electron in the outermost orbit of carbon atom is ?
(a) 8
(b) 2
(c) 4
(d) 6
Answer: 4
40.A radio station broadcast at 30m wavelength.The frequency of broadcast wiil be-
(a) 30Hz
(b) 300Hz
(c) 10MHz
(d) 10KHz
Answer: 10MHz
49. Three equal resistors of hundred ohm is connected in series across a source of E.m.f
30V.What would be the power consumed by is resistor?
(a) 10 W
(b) 30 W
(c) 90 W
(d) 60 W
Answer:10 W
55.If the power factor of a circuit is unity, its reactive power is-
(a) A maximum
(b) Equal to FR
(c) Zero
(d) A negative quantity
Answer: Zero
57.Dose the transformer draw any current when its secondary is open ?
(a) No
(b) Yes
(c) Take rated current
(d) None
Answer: Yes
58.A transformer has negative voltage regulation when its load power factor is-
(a) Zero
(b) Unity
(c) Leading
(d) Lagging
Answer: Leading
61. Which of the following materials does not have covalent bonds ?
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(a) Organic polymers
(b) Silicon
(c) Metals
Ans: c
68. Due to which of the following reasons aluminium does not corrode in atmosphere ?
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(a) Aluminium is a noble metal
(b) Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on
the surface of aluminium
(c) No reaction with oxygen occurs ft Any of the above
Ans: b
72. Carbon rods are used in wet and dry cells because
(a) carbon rod serves as conductor
(b) carbon can resist the attack of battery acid
(c) both (a) and (b)
(d) either (a) or (b)
Ans: c
73. Due to which of the following factors the brush wear rate is altered ?
(a) Speed of the machine
(b) Contact pressure
(c) Surface conditions of brush and commutator
(d) Excessive sparking
(e) All of the above
Ans: e