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79.

In a low power factor wattmeter, why is a compensating coil employed?
(a) To neutralize the capacitive effect of pressure coil
(b) To compensate for inductance of pressure coil
(c) To compensate for the error caused by power loss in the pressure coil
(d) To compensate for the error caused by eddy currents

asked in Electrical Paper-1, 2007

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80.

Which of the following statements are correct in case of a power factor meter?
1. The deflection is proportional to the phase angle between field coil and crossed coil.
2. The restoring torque is provided by a controlling torque.
3. It consists of two coils mounted at right angles to each other.
Select the correct answer using the codes given below
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3

asked in Electrical Paper-1, 2007

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81.

Match List I with List II and select the correct answer using the codes given below the lists.

List I (Name of Instrument)
A. Ohmmeter
B. Watt hour meter
C. Null balance recorders
D. Rayleigh current balance
List II (Classification)
1. Absolute
2. Indicating
3. Recording
4. Integrating

a. A→1, B→2, C→3, D→4
b. A→2, B→4, C→3, D→1
c. A→2, B→4, C→1, D→3
d. A→1, B→2, C→4, D→3

asked in Electrical Paper-1, 2007

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82.

Which one of the following is the main cause of creeping in the induction type energy meters?
(a) Friction compensation
(b) Lag/Lead compensation
(c) Overload compensation
(d) Braking torque producing system

asked in Electrical Paper-1, 2007

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83.

Which one of the following is the correct statement?
Due to inductance in the pressure coil the dynamometer wattmeter
(a) reads Iowan lagging PF and high on leading PF
(b) reads high on lagging PF and Iowan leading PF
(c) reading is not affected at all
(d) always reads low

asked in Electrical Paper-1, 2007

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84.

The temperature coefficient of resistance of a wire is 0.0008/°C. If the resistance of the wire is 8 Ω at 0°C, what is the resistance at 100°C?
(a) 8.64 Ω
(b) 8.08 Ω
(c) 7.92 Ω
(d) 7.20 Ω

asked in Electrical Paper-1, 2007

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