In a ballistic galvanometer, a charge of 100 ?C gives a first swing of 25�. The

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Question
In a ballistic galvanometer, a charge of 100 ?C gives a first swing of 25�. The charge required to cause first swing of 50� is
Options
A. 200 ?C
B. 400 ?C
C. 50 ?C
D. 25 ?C

Correct Answer

400 ?C

Explanation

swing is proportional to charge.

Measurements and Instrumentation problems

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1. The coil of a moving iron instrument has a resistance of 500 ? and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 ?, its reading when fed by 250 V, 50 Hz ac will be
Options
A. 260 V
B. 252 V
C. 250 V
D. 248 V

2. In a CRO which of the following is not a part of electron gun
Options
A. cathode
B. grid
C. accelerating anode
D. X - Y plates

3. Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?
Options
A. Power can be measured by this method only for star connected loads
B. When two wattmeters have equal readings power factor is 0.5.
C. When power factor is 1, one of the wattmeters readings is zero
D. When the two wattmeter read equal and opposite, p.f. is zero.

4. A voltmeter using thermocouples measures
Options
A. rms value
B. peak value
C. average value
D. peak to peak value

5. The angle ? for a mica capacitor is about
Options
A. 25�
B. 15�
C. 5�
D. 1�

6. In a strain measuring device using a strain gauge, the output quantity is
Options
A. voltage
B. resistance
C. impedance
D. either (a) or (b)

8. A dynamometer wattmeter is connected in ac circuit. The measured power is
Options
A. rms power
B. average power
C. peak power
D. instantaneous power

9. A meter with a resistance of 100 ? and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be
Options
A. 490 ?
B. 5000 ?
C. 4900 ?
D. 5100 ?

10. A dynamometer wattmeter is connected in ac circuit. The reading will be
Options
A. V-A product
B. average power
C. peak power
D. instantaneous power

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