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MODULE – 03(FEB 2018) ELECTRICAL FUNDAMENTAL PAPER

Module 3 Electrical February 2018 Session

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 When an atom gains an electron it becomes – Negative, Positive or Neutral

 A 24V battery is supplying 5C to a heater for 2 seconds, what is the current? –
4.6 amps 9.6 amps
 Which of the following has most free electrons? Non-metals, Conductor, Semi-
conductor
 What is the unit of current? Ampere/sec, Ampere*sec, Ampere
 What is the unit of capacitance? Coulomb/Volt, Coulomb*Volt, Volt/Coulomb
 Characteristics of a standard circuit? Has voltage source, Has current flowing
through the circuit with some resistance, All
 Magnetic shielding is – Twisted pair of wires, Non twisted wires, braided coper
wires.
 What is reluctance–opposition to current, opposition to magnetic field
 Magnetism is – Absolute permeability, Relative Permittivity, Absolute
permittivity, both Absolute and Relative Permittivity
 Materials magnetized lightly in opposite direction to the applied magnetic field –
Para magnetic, Diamagnetic, Ferromagnetic
 Batteries who’s reaction can be reversed are – Secondary, Primary
 Trickle charge is done to
 Resistance is parallel – R1 + R, R1 + R2/R1*R2, R1 * R2/R1+R2
 If 100 bulbs are connected in series and one bulb is fused the circuit will –
Operate normally, All bulb will fuse, No Bulb will work
 Thermocouples have – Negative or Positive temp coefficient
 Lap winding is used for – Large current, Large voltage, large emf
 When a secondary of transformer is not loaded the primary uses – Some
current, Magnetizing current, No effect
 EMF of a coil depends upon
 Relation of EMF with inductance of a coil
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MODULE – 03(FEB 2018) ELECTRICAL FUNDAMENTAL PAPER

 In AC which is true – Current increases in one direction and then reverses,

Current increases in one direction and then changes magnitude also
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 Resistance used for high current – Wire wound, Carbon

 What is additive in parallel combination – Resistance, Impedance or Capacitance
 1 kW of work is done in 10 ohm resistance. What is the Current?
 1 joule of work is done in 1 second. The power is – 1 W,0.1W,1kW
 Resistance numerical Length 10 meter, P=5*10-8 area 100 m2
 Magnetic poles are – Paired, North can exist freely, singular
 A capacitor charges to 0.632 times its full capacity , This is – Time constant, Rate
constant
 What converts ac to dc – commutator, armature, field coil
 RMS value in terms of peak value
 In single phase shaded pole motor – Direction can’t be changed, Direction can
be changed by interchanging connections
 In capacitive circuit - V leads I by 90°, I leads V by 90°, I leads V by angle less than
90 but more than 0°
 What blocks certain frequency but allows all frequency above and below
 Attenuation is measure in – dB, Voltage, ampere
 What’s used to eliminate certain frequencies – Oscillator, Filter
 Generators can have – Revolving field, revolving armature, both
 Static discharge occurs when two objects are charged – similarly, dissimilarly
 Which are electrical terms – Torque and speed, Torque and current
 Topics - Coulombs law formula, Flux linkage, Electrostatic discharge, True power,
Permeability value, Characteristics of 3 phase ac, Losses in transformer, reactive
power, dielectric, inductor principle, thermocouple use.
 Rating of transformer – kVA
 Unit of conductance – Siemen
 Unit of magnetic potential – Vector quantity
 Electrical unit – Coulomb
 Power loss in circuit – I2 R
 Thermistor is positive then increase in temp will - Increase resistance
 Vent cap in battery used for – Escape of gases
 TV and radio frequencies - Band pass filter
 Numerical Potential energy - mgh
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MODULE – 03(FEB 2018) ELECTRICAL FUNDAMENTAL PAPER

 Frequency at which Xl=XC – resonance frequency

 Hunting in motor occurs – due to varying load and change in frequency
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 Form factor – RMS value/Average value

 Rate of flow of charge – Ampere
 MTCS – Insulators can hold more charge than conductor, Good conductor store
charge, Dielectric must not be used in charge, All
 Transformer whose value is K – ideal transformer
 Shape of brush – Rectangular block
 Power dissipated in – inductive circuit
 Property of coil which opposes the current – Self-induced emf
 Highly magnetic material – Ferromagnetic
 Weekly magnetic – Paramagnetic
 Resistance depends upon – length, area and temperature
 Which has same mass as a proton - Neutron
 ‘n’ Capacitor in parallel then plates – n, n+1, n-1, 2n
 If frequency ‘f’ and no. of poles is ‘p’ speed = 120f/p
 Loss due to bearing and friction in motor – mechanical loss
 Voltage developed due to chemical reaction
 Characteristics of current – DC in same direction and AC varies in magnitude
 Resistance connected in parallel – voltage same and variable current
 Topics - Lenz’s law, Balance system, Auto transformer use, Ohm’s law – V=IR,
Coulombs law formula, Faraday’s law Characteristics of lead acid battery
Electrical characteristics of motor, synchronous motor, capacitor in parallel
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