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Electronic Instruments MCQs
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Electronic Instruments MCQs
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25 Questions

1. A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement?
2. What is the total resistance of a voltmeter on the 10 V range when the meter movement is rated for 50 μA of full-scale current?
3. For display of signal pattern ............ voltage is applied to the horizontal plates of a CRO
4. The most accurate device for measuring voltage is .............
5. The sensitivity of a multimeter is given in .................
6. The input resistance of a VTVM is about ...........
7. An ammeter should have .............. resistance
8. Which of the following is likely to have the largest resistance?
9. The horizontal plates of a CRO are supplied with ............. to observe  the waveform of signal.
10. If a multimeter has a sensitivity of 1000 Ω per volt and reads 50 V full scale, its internal resistance is ...........
11. A voltmeter should have .......... resistance
12. A CRO is used to measure .............
13. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ..........
14. If the full-scale deflection current of a multimeter is 50 μA, its sensitivity is ........
15. To send 10% of the main current through a moving coil galvanometer of resistance 99 Ω the shunt required is ..............
16. A VTVM is never used to measure ..............
17. A galvanometer in series with a high resistance is called ...............
18.  A VTVM has .......... input resistance than that of a multimeter
19. A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ..................
20. A voltmeter is connected in a .............. with the circuit component across which potential difference is to be measured
21. Two multimeters A and B have sensitivities of 10 kΩ/V and 30 kΩ/V respectively. Then ..............
22. If the negative potential on the control grid of CRT is increased, the intensity of spot .............
23. The materil used to coat inside the face of CRT is ..............
24. 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 ...............
25. 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 .............

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