Electrical And Electronic Measurement MCQs

Question 1

Instrument accuracy is defined as

Accepted Answer

closeness with which an instrument reading approaches the true value of the quantity being measured

Answer

the measure of consistency or reproduci-bility of the measurements

Answer

the smallest measurable input change

Answer

the ratio of the change in output signal to the change in the input signal

Question 2

Instrument efficiency is defined as

Accepted Answer

the ratio of the measured quantity at full scale to the power taken by the instrument at full scale

Answer

the ability of the instrument to read the smallest input changes

Answer

the ratio of the change in output signal to the change in input signal

Answer

the ability of the system to reproduce the output in the same form as the input

Question 3

A current transformer

Accepted Answer

should never have its secondary open while the primary is carrying current

Answer

should have its secondary open while the primary is carrying current

Answer

is never used with the seconday circuit closed through ammeters, wattmeters, current coils or relay coils

Answer

may keep the secondary circuit closed without any serious trouble

Question 4

Anderson bridge

Accepted Answer

is applicable for precise measurement of inductances over a wide range of values

Answer

requires a standard inductor in terms of which the loss angle of the capacitor is expressed

Answer

is applicable for precise measurement of capacitances

Answer

requires a standard resistor in terms of which the self inductance is expressed

Question 5

Hay's bridge is particularly suited for measurement of capacitance over a wide range of values

Accepted Answer

is suited for measurement of capacitance having high Q-value

Answer

is particularly suited for measurement of inductance having high Q-value

Answer

is suited for measurement of inductance having low Q-value

Question 6

Wien bridge is used for the measurement of

Accepted Answer

frequency

Answer

resistance

Answer

capacitance

Answer

inductance

Question 7

AC bridges have

Accepted Answer

both (a) and (b) above

Answer

leakage error and eddy current errors only

Answer

residual errors, frequency errors and waveform errors only

Answer

no error

Question 8

Induction type single phase energymeter is

Accepted Answer

true watt-hour meter

Answer

an ampere-hour meter

Answer

wattmeter

Answer

none of these

Question 9

Two-wattmeter method can be used to measure the total power delivered to

Accepted Answer

star as well as delta connected loads

Answer

star connected load only

Answer

delta connected load only

Answer

star connected with neutral load