# The effective reactance of an inductive coil

1.  Increases because of stray capacitance as the frequency increases

2.  Decreases because of stray capacitances as the frequency increases

3.  Remain the same irrespective of the increase in frequency even if stray series capacitance are present

4.  None of these

4

Decreases because of stray capacitances as the frequency increases

Explanation :
No Explanation available for this question

# A compensated wattmeter has its reading corrected for error due to the

1.  Frequency

2.  Friction

3.  Power consumed in current coil

4.  Power consumed in potential coil

4

Power consumed in potential coil

Explanation :
No Explanation available for this question

# While measuring power in three phase load by two wattmeter method, the reading of the two wattmeters will be equal and opposite when

1.  Power factor is unity

3.  Phase angle is between 600 and 900

4.  The load is purely inductive

4

Explanation :
No Explanation available for this question

# The sensitivity of a voltmeter using 0 to 5 mA meter movement is

1.  50 ohm / volt

2.  100 ohm / volt

3.  200 ohm / volt

4.  500 ohm / volt

4

200 ohm / volt

Explanation :
No Explanation available for this question

# If a dynamometer type wattmeter is connected in an a.c circuit the power indicated by the wattmeter will be

1.  Volt-ampere product

2.  Average power

3.  Peak power

4.  Instantaneous power

4

Average power

Explanation :
No Explanation available for this question

# DC voltage of the order of a few mV can be measured accurately using a/an

1.  Moving coil voltmeter

2.  Null-balancing potentiometer

3.  Moving iron voltmeter

4.  Electrostatic voltmeter

4

Null-balancing potentiometer

Explanation :
No Explanation available for this question

# The “accuracy” of a measuring instrument is determined  by

1.  Closeness of the value indicated by it to the correct value of the measurand

2.  Repeatability of the measured value

3.  Speed with which the instrument’s reading approaches the final value

4.  Least change in the value of the measurand that could be detected by the instrument

4

Closeness of the value indicated by it to the correct value of the measurand

Explanation :
No Explanation available for this question

# In the two-wattmeter method of measuring power in a balanced three-phase circuit, one wattmeter shows zero and the other positive maximum. The load power factor is

1.  Zero

2.     0.5

3.    0.866

4.  1.0

4

0.5

Explanation :
No Explanation available for this question

# A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance Rx. A voltmeter having a resistance of 1.2 K-ohm is connected across 600 ohm resistance and reads 5V. The value of resistance Rx will be

1.  120 ohm

2.    400 ohm

3.   1.8 ohm

4.     2.4 k- ohm

4

2.4 k- ohm

Explanation :
No Explanation available for this question

# ‘Creep’ is energy meters can be prevented by

1.  Using extra turns on the voltage coil

2.  Having two holes on opposite sides of the disc

3.  Using a stronger brake magnet

4.  Using steel laminations of high permeability

4

Having two holes on opposite sides of the disc

Explanation :
No Explanation available for this question

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