Electrical And Electronic Measurement MCQs

Question 1

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 secondary circuit closed through ammeters, wattmeters, current coils or relay coils

Answer

may keep the secondary circuit closed without any serious trouble

Question 2

If the secondary winding of current transformer is left open

Accepted Answer

current transformer will blast

Answer

there will be no current in the primary

Answer

no damage will result

Answer

there will be only magnetizing component of current in the primary

Question 3

Instrument transformers are used in ac system for help in the measurement of

Accepted Answer

all of these

Answer

current and voltage

Answer

power and energy

Answer

power factor

Question 4

For an instrument transformer, the ratio error is defined as

Accepted Answer

nominal ratio-actual ratio/actual ratio

Answer

rated primary current/rated secondary current

Answer

actual ratio/nominal ratio

Answer

actual ratio-nominal ratio/nominal ratio

Question 5

Schering bridge is used to measure

Accepted Answer

capacitance and its power factor

Answer

resistance

Answer

frequency

Answer

input voltage

Question 6

The dielectric loss of a capacitor can be measured by

Accepted Answer

Schering bridge

Answer

Wien bridge

Answer

Owen bridge

Answer

Maxwell bridge

Question 7

Anderson bridge

Accepted Answer

is applicable for precise measurement of inductances of 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 8

Hay's bridge

Accepted Answer

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

Answer

is particularly suited for measurement of capacitance over a wide range of values

Answer

is suited for measurement of capacitance having high Q-value

Answer

is suited for measurement of inductance having low Q-value

Question 9

AC bridges have

Accepted Answer

both (a) and (b) above

Answer

leakage error and eddy current errors only

Answer

residual erros, frequency errors and waveform errors only

Answer

no error