Electrical And Electronic Measurement MCQs

Question 1

Which one of the following terms is NOT associated with a sample-and-hold circuit?

Accepted Answer

Conversion time

Answer

Acquisition time

Answer

Aperture time

Answer

Sample mode

Question 2

In a linear, an input of 5 sin cot produces an output of 10 cos wt. The output corresponding to input 10 cos wt will be used to

Accepted Answer

?20 sin 03 t

Answer

+5 sin on

Answer

?5 sin on

Answer

+20 sin on

Question 3

When an ac voltage is applied to a PMMC voltmeter

Accepted Answer

meter reading is zero

Answer

the mater gets damaged

Answer

pointer will oscillate to and fro

Answer

the pointer will not move at all

Question 4

A simple moving coil meter can not be used to measure radio frequency currents because

Accepted Answer

the meter would introduce an inductive reactance in the circuit

Answer

large heat dissipation results

Answer

damping of the meter becomes difficult of radio frequencies

Answer

the meter is not very accurate at radio frequencies

Question 5

The error which does not result in moving iron instrument for both ac and dc measurements

Accepted Answer

eddy current error

Answer

stray magnetic field error

Answer

hysteresis error

Answer

temperature error

Question 6

The advantage of a moving iron instrument is that

Accepted Answer

it can be used under severe overload condition

Answer

it has linear scale

Answer

its current sensitivity is high

Answer

it can be used at high frequencies

Question 7

Moving iron meters can be used upto frequency of

Accepted Answer

1500 Hz

Answer

50 Hz

Answer

100 Hz

Answer

500 Hz

Question 8

The advantage of electrodynamometer type of instruments is

Accepted Answer

the coil being air cored, these instruments are free from hysteresis and eddy current errors

Answer

low torque/weight ratio

Answer

large operating current

Answer

non uniform scale

Question 9

The advantage of electrostatic instruments is that

Accepted Answer

their indicating scale is uniform

Answer

they are cheap, robust and small in size

Answer

their operating forces are large

Answer

their power drain from the mains is negligible