Electronic Instruments MCQ
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Attempt Free Electronic Instruments MCQ Here. Read The Important Electricity MCQ From Below.
Q1. An ammeter is connected in …………….. with the circuit element whose current we wish to measure
Series
Parallel
Series or parallel
None of the above
Answer : 1
Q2. A galvanometer in series with a high resistance is called ……………
An ammeter
A voltmeter
A wattmeter
None of the above
Answer : 2
Q3. An ammeter should have ………….. resistance
Infinite
Very large
Very low
None of the above
Answer : 3
Q4. A voltmeter is connected in a ………….. with the circuit component across which potential difference is to be measured
Parallel
Series
Series or parallel
None of the above
Answer : 1
Q5. A voltmeter should have ………. resistance
Zero
Very high
Very low
None of the above
Answer : 2
Electronic Instruments MCQ
Q6. The sensitivity of a multimeter is given in ……………..
Ω
Amperes
kΩ/V
none of the above
Answer : 3
Q7. If the full-scale deflection current of a multimeter is 50 μA, its sensitivity is ……..
10 kΩ/V
100 kΩ/V
50 kΩ/V
20 kΩ/V
Answer : 4
Q8. If a multimeter has a sensitivity of 1000 Ω per volt and reads 50 V full scale, its internal resistance is ………..
20 kΩ
50 kΩ
10 kΩ
None of the above
Answer : 2
Q9. A VTVM has ………. input resistance than that of a multimeter
More
Less
Same
None of the above
Answer : 1
Q10. The input resistance of a VTVM is about ………..
1000 Ω
10 kΩ
20 kΩ
10 MΩ
Answer : 4
Q11. If the negative potential on the control grid of CRT is increased, the intensity of spot ………….
Is increased
Is decreased
Remains the same
None of the above
Answer : 2
Electronic Instruments MCQ
Q12. For display of signal pattern ………… voltage is applied to the horizontal plates of a CRO
Sinusoidal
Rectangular
Sawtooth
None of the above
Answer : 3
Q13. Two multimeters A and B have sensitivities of 10 kΩ/V and 30 kΩ/V respectively. Then …………..
Multimeter A is more sensitive
Multimeter B is more sensitive
Both are equally sensitive
None of the above
Answer : 2
Q14. A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ………………
GS/(G+S)
G+S
G-S
None of the above
Answer : 1
Q15. A VTVM is never used to measure …………..
Voltage
Current
Resistance
None of the above
Answer : 2
Q16. The sensitivity of a voltmeter which uses a 100 μA meter movement is ……………..
1 kΩ/V
10 kΩ/V
5 kΩ/V
Data insufficient
Answer : 2
Electronic Instruments MCQ
Q17. 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?
10 kΩ
20 kΩ
200 kΩ
None of the above
Answer : 3
Q18. The materil used to coat inside the face of CRT is …………..
Carbon
Sulphur
Silicon
Phosphorous
Answer : 4
Q19. When an ammeter is inserted in the circuit, the circuit current will ………..
Increase
Decrease
Remain the same
None of the above
Answer : 2
Q20. A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement?
3 kΩ
6 kΩ
4 kΩ
2 kΩ
Answer : 1
Electronic Instruments MCQ
Q21. The most accurate device for measuring voltage is ………….
Voltmeter
Multimeter
CRO
VTVM
Answer : 3
Q22. The horizontal plates of a CRO are supplied with …………. to observe the waveform of signal.
Sinusoidal wave
Cosine wave
Sawtooth wave
None of the above
Answer : 3
Q23. A CRO is used to measure ………….
Voltage
Frequency
Phase
All of above
Answer : 4
Q24. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ……….
G/50
G/49
49 G
50 G
Answer : 2
Electronic Instruments MCQ
Q25. Which of the following is likely to have the largest resistance?
Voltmeter of range 10 V
Moving coil galvanometer
Ammeter of range 1 A
A copper wire of length 1 m and diameter 3 mm
Answer : 1
Q26. An ideal ammeter has ………… resistance
Low
Infinite
Zero
High
Answer : 3
Q27. The resistance of an ideal voltmeter is …………
Low
Infinite
Zero
High
Answer : 2
Q28. To send 10% of the main current through a moving coil galvanometer of resistance 99 Ω the shunt required is …………..
11 Ω
9 Ω
100 Ω
9 Ω
Answer : 1
Electronic Instruments MCQ
Q29. 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 ……………
nG
G/n
G/(n-1)
(n-1)G
Answer : 4
Q30. 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 ………….
nG
(n-1)G
G/(n-1)
G/n
Answer : 3
Electronic Instruments MCQ
