# Creeping in a single phase induction type energy meter may be due to

1.  Overcompensation for friction

2.  Over voltage

3.  Vibrations

4.  All of these

4

All of these

Explanation :
No Explanation available for this question

# Light load adjustments for induction type energy meters are usually done at

1.  10% of full load current

2.  5% of full load current

3.  50% of full load current

4.  1% of full load current

4

Explanation :
No Explanation available for this question

# The controlling torque I single-power factor meters is provided by

1.  Spring control

2.  Gravity control

3.  Stiffness of suspension

4.  None of these

4

None of these

Explanation :
No Explanation available for this question

# There will be serious errors, if power factor of non-sinusoidal waveforms is measured by electrodynamometer power factor meters. This is true of

1.  Only single phase meters

2.  Only 3 phase meters

3.  Both single and three phase meters

4.  None of these

4

Only single phase meters

Explanation :
No Explanation available for this question

# A resistance of value 10 approximately is to be measured-voltmeter method with resistance of ammeter is 0.02 ? and that of voltmeter is 5000?. The resistance should be measured by

1.  Connected the ammeter on the side of unknown resistance as this connection

2.  Connected the voltmeter on the side of unknown resistance as this connection gives batter accuracy

3.  any of the two connection as both of them give equal frequency

4.  None of these

4

Connected the ammeter on the side of unknown resistance as this connection

Explanation :
No Explanation available for this question

# The power consumption of a d.c. voltmeter using a direct coupled amplifier when measuring a voltage 0.5 V is of the order of a few

1.  Watt

2.    Milliwatt

3.       Microwatt

4.         Nanowatt

4

Nanowatt

Explanation :
No Explanation available for this question

# A true reading voltmeter uses two thermocouples in order

1.  To increase sensitivity

2.  That the second thermocouple cancels out the no-linear effects of the first thermocouple

3.  To prevent drift in the d.c. amplifier

4.  All of these

4

That the second thermocouple cancels out the no-linear effects of the first thermocouple

Explanation :
No Explanation available for this question

# A current transformer has a rating of 100/5 A. its magnetizing and loss component of exciting current are 10 A and 0.6 A respectively and secondary winding burden is purely resistive, its transformation ratio at rated current is

1.  20.12

2.          20.2

3.    200.2

4.             none of these

4

20.12

Explanation :
No Explanation available for this question

# A current transformer has a rating of 1000/5 A. Its magnetizing current and loss component of exciting current are 10 A and 6 A respectively. The phase angle between secondary winding induced voltage and current is 300. The phase angle error of the transformer at rated current is

1.  0.650

2.      0.3050

3.      0.4960

4.     none of these

4

none of these

Explanation :
No Explanation available for this question

# The errors in current transformers can be reduced by designing them with

1.  High permeability and low loss core materials, avoiding any joints in the core and also keeping the flux density to a low value

2.  Using primary and secondary windings as close to each other as possible

3.  Using large cross-sections for both primary and secondary winding conductors

4.  All of these

4