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67.

Why is strain gauge bridge sometimes excited with AC?
(a) It has a stable performance with AC
(b) Its sensitivity is more with AC
(c) Power frequency pick-up can be
(d) AC output can be easily amplified avoided with AC

asked in Electrical Paper-1, 2007

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68.

Which of the following are the advantages of a balanced bridge vacuum tube voltmeter in comparison with a conventional VTVM?
1. Higher input impedance.
2. Effect of changes due to variation In value characteristics is minimized.
3. Power supply fluctuations have less effect on measurement.
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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69.

What is the approximate input impedance of a CRG?
(a) Zero
(b) 1MΩ
(c) 10 Ω
(d) 10 µΩ

asked in Electrical Paper-1, 2007

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70.

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

List I (Type of electronic voltmeter)
A. Amplifier Rectifier
B. Rectifier Amplifier
C. True RMS
D. Logarithmic
List II (Leading characteristics)
1. Wide input signal, dynamic range
2. High resistivity, limited bandwidth
3. Limited resistivity, large bandwidth
4. Capability to read non-sinusoidal AC

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

asked in Electrical Paper-1, 2007

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