# In order to reduce errors on account of temperature, instruments are provided with shunts use series connected swamping resistance. In order that errors on account temperature changes be low, the swamping resistance

1.  Should be made of a material giving a high resistance temperature co-efficient

2.  Should be made of a material having a low resistance temperature co-efficient with the value of swamping resistance equal to meter resistance

3.  Should be made of a material having low resistance temperature co-efficient and should have a value of about 20-30 times that of meter resistance

4.  Should have a infinite value

4

Should be made of a material having low resistance temperature co-efficient and should have a value of about 20-30 times that of meter resistance

Explanation :
No Explanation available for this question

# A 4-range milliammeter having ranges of 0-10  mA, 0-50 mA, 0-100 mA and 0-500 mA. It is used for measurement of current whose magnitude is not known. In order to prevent damage to the instrument the selector switch of the ammeter should be first placed at

1.  0-10  mA

2.    0-50 mA

3.    0-100 mA

4.    0-500 mA

4

0-500 mA

Explanation :
No Explanation available for this question

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

1.  999

2.    9999 ?

3.    9900 ?

4.     990 ?

4

9900 ?

Explanation :
No Explanation available for this question

# A d’Arsonval movement is rated at 50 µA. its sensitivity is

1.  20000/V

2.    200000 ?/V

3.    200 ?/V

4.    cannot be determined

4

20000/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 making is on the left hand side of side while  marking is on the right hand side

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

3.  Any of the above two marking can be 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 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 producers 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 electrodynamometer 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