electronic instruments MCQs – Page 2

Practise focused electronic instruments questions with marked answers for exam preparation and subject revision.

electronic instruments Mcqs
21. A CRO is used to measure _________________?
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A. Phase

B. Voltage

C. Frequency

D. All of above
22. When an ammeter is inserted in the circuit, the circuit current will _____________?
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A. Increase

B. None of the above

C. Remain the same

D. Decrease
23. To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?
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A. 100 O

B. 9 O

C. 11 O

D. 9 O

24. The input resistance of a VTVM is about ______________?
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A. 10 MO

B. 10 kO

C. 1000 O

D. 20 kO

25. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ________________?
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A. G/50

B. G/49

C. 49 G

D. 50 G

26. An ammeter should have_____________ resistance?
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A. Very low

B. None of the above

C. Infinite

D. Very large

27. What is the total resistance of a voltmeter on the 10 V range when the meter movement is rated for 50 A of full-scale current ?
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A. 20 kO

B. 200 kO

C. None of the above

D. 10 kO

28. A voltmeter is connected in a _____________ with the circuit component across which potential difference is to be measured?
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A. Series or parallel

B. Parallel

C. None of the above

D. Series

29. If a multimeter has a sensitivity of 1000 O per volt and reads 50 V full scale, its internal resistance is _____________?
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A. 20 kO

B. None of the above

C. 10 kO

D. 50 kO
30. The sensitivity of a voltmeter which uses a 100 A meter movement is ____________?
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A. 10 kO/V

B. 5 kO/V

C. 1 kO/V

D. Data insufficient