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.

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1.
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

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

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

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

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

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

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