# The sensitivity of thermostats as compared with sensitivity of platinum resistance temperature detector over a temperature range of  -1000 to 4000 C to change in temperature is

1.  100  times

2.  106 times

3.  107 times

4.  103 times

4

106 times

Explanation :
No Explanation available for this question

# Which one of the following methods is used to measure power output of a radio transmitter while it is radiating

1.  Electrostatic meter

2.  Three-wattmeter method

3.  Three-ammeter method

4.  Two-wattmeter method

4

Three-ammeter method

Explanation :
No Explanation available for this question

# The resistance of a thermometer is 5 at 30oC and 6. 5? at 60oC. Using linear approximation, the value of resistance temperature coefficient at 45o is

1.  0.009/oC

2.  0.0087/oC

3.  0.0085/oC

4.  0.01/oC

4

0.0087/oC

Explanation :
No Explanation available for this question

# A zero to 300 V  voltmeter has an error of 12% of the full scale deflection. If the true voltage is 30 V, then the range of readings on this voltmeter would be

1.  20 V to 40V

2.  24V to 36V

3.  29.4V to 30.6 V

4.  29.94 to 30.06V

4

29.4V to 30.6 V

Explanation :
No Explanation available for this question

# What will happen if a voltmeter is connected like an ammeter in series to the load

1.  The meter will burn out

2.  The measurement will be too high

3.  An inadmissibly high current will flow

4.  There will be almost no current in the circuit

4

There will be almost no current in the circuit

Explanation :
No Explanation available for this question

# Which one of the following types of indicating instruments is an electrometer

1.  Electrodynamometer

2.  PMMC

3.  Electrostatic

4.  Moving Iron

4

Electrostatic

Explanation :
No Explanation available for this question

# In the case of power measurement by two wattmeter method in a balanced 3-phase system with a pure inductive load

1.  Both the wattmeters will indicate the same value but with opposite signs

2.  Both wattmeters will indicate the same value with same sign

3.  Both the wattmeters will indicate zero

4.  One wattmeter will indicate zero and the other will indicate some non-zero value

4

Both the wattmeters will indicate the same value but with opposite signs

Explanation :
No Explanation available for this question

# A 230V,10 A, single phase energymeter makes 90 revolutions in 3 minutes at half load rated voltage and unity p.f. If the meter constant is 1800 revolutions/kWh, then its error at half load will be

1.  13.04 % slow

2.  13.04% fast

3.  15 % slow

4.  15 % fast

4

15 \% slow

Explanation :
No Explanation available for this question

# A  certain meter has a sensitivity of 50,000/V. The current required to deflrct the meter movement to full-scale will be

1.  5 µA

2.  10 µA

3.  20 µA

4.  50 µA

4

20 µA

Explanation :
No Explanation available for this question

# One single phase wattmeter operating on 230V and 5 A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. The power factor of the load will be

1.  1

2.  0.8

3.  0.7

4.  0.6

4