# A 1 mA d'Arsonval movement has resistance of 100Ω It is to be converted to a 10 V voltmeter. The value of multiplier resistance is

1.  999Ω

2.  9999Ω

3.  9900Ω

4.  990Ω

4

9900Ω

Explanation :
No Explanation available for this question

# A d'Arsonval movement is rated at 50μA. Its sensitivity is

1.  20000Ω/ V

2.  200000Ω /V

3.  200Ω/V

4.  cannot be determined

4

20000Ω/ V

Explanation :
No Explanation available for this question

# The power consumption PMMC instruments is typically about

1.  0.25 W to 2 W

2.  0.25 mW to 2 mW

3.  25 μW to 200 μW

4.  none of these

4

25 μW to 200 μW

Explanation :
No Explanation available for this question

# Series type ohmmeter

1.  0 marking is on the left hand side of side while cc marking is on the right hand side

2.  marking is on the right hand side of scale and co infinity marking on the left hand side

3.  any of the above two marking can he on left or right side of the scale

4.  0 marking is in the middle of scale

4

marking is on the right hand side of scale and co infinity marking on the left hand side

Explanation :
No Explanation available for this question

# Which of the following are disadvantages of shunts for use at high currents

1.  It is difficult to achieve good accuracy with shunts

2.  Power consumption of the shunts is large

3.  The metering circuit is not electrically isolated from the power circuit

4.  All of these

4

All of these

Explanation :
No Explanation available for this question

# In electrodynamometer type of wattmeters, the inductance of pressure coil circuit produces error, which is

1.  constant irrespective of the power factor of the load

2.  higher at low power factors

3.  lower at low power factors

4.  none of these

4

higher at low power factors

Explanation :
No Explanation available for this question

# When measuring power with an electrodynathometer wattmeter in a circuit Where the load current is small

1.  the current coil should be connected on the load side

2.  the pressure coil should be connected on the load side

3.  it is immaterial whether current coil or pressure coil is connect on the load side

4.  none of these

4

the current coil should be connected on the load side

Explanation :
No Explanation available for this question

# Which of the following meter is most suitable for measuring radio frequency currents

1.  Moving-coil meter

2.  Moving-iron meter

3.  Thermocouple meter

4.  VTVM

4

Thermocouple meter

Explanation :
No Explanation available for this question

# When measuring power with an electrodynamometer wattmeter in a circuit having a low power factor

1.  the current coil should be connected on the load side

2.  the current coil should be connected on the supply side

3.  the pressure coil should be connected on the load side

4.  a compensated wattmeter with pressure coil connected on the load side should be used

4

a compensated wattmeter with pressure coil connected on the load side should be used

Explanation :
No Explanation available for this question

# The power in a 3 phase circuit is measured with the help of 2 wattmeters. The readings of one of wattmeters is positive and that of the others h negative. The magnitude of readings is different It can be concluded that the power factor of the circuit is

1.  unity

2.  zero (lagging)

3.  0.5 (lagging)

4.  less than 0.5 (lagging)

4