Electronic Instruments MCQ Questions and Answers for Practice

1. A galvanometer in series with a high resistance is called ..................

1. a voltmeter
2. a wattmeter
3. none of the above
4. an ammeter

2. A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ...............

1. G + S
2. G - S
3. none of the above
4. GS/(G + S)

3. A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement ?

1. 1.5 kohm
2. 4.5 kohm
3. 6 kohm
4. 3 kohm

4. A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is .....................

1. G/n
2. G/(n - 1)
3. (n - 1)G
4. nG

5. A voltmeter is connected in ............... with the circuit component across which potential difference is to be measured

1. series
2. series or parallel
3. none of the above
4. parallel

6. A voltmeter should have .............. resistance

1. very high
2. very low
3. none of the above
4. zero

7. A VTVM has ............... input resistance than that of a multimeter

1. less
2. same
3. none of the above
4. more

8. A VTVM is never used to measure ...............

1. current
2. resistance
3. none of the above
4. voltage

9. An ammeter has a resistance of G ohms and range of I amperes. The value of resistance required in parallel to convert it into an ammeter of range nI is ....................

1. (n - 1)G
2. G/(n - 1)
3. G/n
4. nG

10. An ammeter is connected in ............... with the circuit element whose current we wish to measure

1. parallel
2. series or parallel
3. none of the above
4. series

11. An ammeter should have ............... resistance

1. very large
2. very low
3. none of the above
4. infinite

12. An ideal ammeter has ............... resistance

1. infinite
2. zero
3. high
4. low

13. The input resistance of a VTVM is about ............

1. 10 kohm
2. 20 kohm
3. 10 Mohm
4. 1000 ohm

14. The resistance of an ideal voltmeter is .........

1. infinite
2. zero
3. high
4. low

15. The sensitivity of a multimeter is given in ...........

1. amperes
2. kohm/V
3. none of the above
4. ohm