Electronic instruments Mcqs
This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Electronic instruments ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Electronic instruments comprehensively.
2. A CRO is used to measure _________________?
Voltage
Frequency
Phase
All of above
Answer & Solution
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3. 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
4. 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 & Solution
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5. The resistance of an ideal voltmeter is ______________?
Low
Infinite
Zero
High
Answer & Solution
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6. 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
7. 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 & Solution
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8. An ideal ammeter has ______________ resistance?
Low
Infinite
Zero
High
9. To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?
11 O
9 O
100 O
9 O
10. 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 & Solution
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11. Two multimeters A and B have sensitivities of 10 kO/V and 30 kO/V respectively. Then ______________?
Multimeter A is more sensitive
Multimeter B is more sensitive
Both are equally sensitive
None of the above
Answer & Solution
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12. 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 kO
20 kO
200 kO
None of the above
13. 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 kO
KO
KO
6 kO
14. When an ammeter is inserted in the circuit, the circuit current will _____________?
Increase
Decrease
Remain the same
None of the above
Answer & Solution
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15. A VTVM is never used to measure ______________?
Voltage
Current
Resistance
None of the above