Electrical Engineering Mcqs Practice Test

Question 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______________?

Accepted Answer

C.	G/(n-1)

Question 2

A CRO is used to measure _________________?

Accepted Answer

D.	All of above

Question 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________________?

Accepted Answer

D.	(n-1)G

Question 4

Which of the following is likely to have the largest resistance ?

Accepted Answer

A.	Voltmeter of range 10 V

Question 5

The resistance of an ideal voltmeter is ______________?

Accepted Answer

B.	Infinite

Question 6

If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ________________?

Accepted Answer

B.	G/49

Question 7

The horizontal plates of a CRO are supplied with _____________ to observe the waveform of signal?

Accepted Answer

C.	Sawtooth wave

Question 8

An ideal ammeter has ______________ resistance?

Accepted Answer

C.	Zero

Question 9

To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?

Accepted Answer

A.	11 O

Question 10

If the negative potential on the control grid of CRT is increased, the intensity of spot _____________?

Accepted Answer

B.	Is decreased

Question 11

Two multimeters A and B have sensitivities of 10 kO/V and 30 kO/V respectively. Then ______________?

Accepted Answer

B.	Multimeter B is more sensitive

Question 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 ?

Accepted Answer

C.	200 kO

Question 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 ?

Accepted Answer

A.	3 kO

Question 14

When an ammeter is inserted in the circuit, the circuit current will _____________?

Accepted Answer

B.	Decrease

Question 15

A VTVM is never used to measure ______________?

Accepted Answer

B.	Current

Question 16

For display of signal pattern _____________voltage is applied to the horizontal plates of a CRO?

Accepted Answer

C.	Sawtooth

Question 17

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

Accepted Answer

A.	GS/(G+S)

Question 18

The sensitivity of a voltmeter which uses a 100 µA meter movement is ____________?

Accepted Answer

B.	10 kO/V

Question 19

The materil used to coat inside the face of CRT is ______________?

Accepted Answer

D.	Phosphorous

Question 20

The most accurate device for measuring voltage is ____________?

Accepted Answer

C.	CRO