**1.** The braking torque of induction type single-phase energy meter is:

**2.** If an energy meter disc makes 10 revolutions in 100 sec when a load of 450 W is connected to it, the meter constant (in rev / kW-h) will be:

- 100
- 800
- 160
- 500

**3.** One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. The Meter constant in revolution is 400. The power factor of the load will be:

**4.** Watt-hour meter can be produced using:

**5.** The meter constant of an energy meter will be given in:

**6.** The full-scale deflection in an induction instrument is about:

**7.** In a watt-hour meter, the creeping error is reduced by:

**8.** An energy meter is designed to have 100 revolutions of the disc per unit of energy consumed. The energy consumed by the load-carrying 50 A at 230 V and 0.8 power factor. Find the percentage error if the meter actually makes 950 revolutions.

- 3.26% , Slow
- 3.15%, Slow
- 3.26%, Fast
- 3.15%, Fast

**9. **The meter constant of a single-phase energy meter is 500 rev/kWh. The meter takes 86 seconds to make 50 revolutions while measuring a full load of 4.4 kW. The percentage error in the meter is

- – 2.43%
- 2.43%
- – 4.86%
- 4.86%

**10.** What does the reading of the first dial on the right of a 4-dial watt-hour meter indicate?

- Number of single units
- Total watts each hour
- Maximum value the meter can register
- Multiplier value of the preceding dial

**11.** Creep error may occur induction type energy meter due to

- Incorrect position of brake magnet
- Incorrect adjustment of position of shading band
- Overvoltage across voltage coil
- Increase in temperature

**12.** An energy meter with a constant of 600 revolutions per unit used for energy measurement. It makes 500 revolutions in 30 seconds. Find the energy consumed by the load for an hour.

**13.** Which energy meter system contains a rotating aluminum disc that is placed between the air gaps of series and shunt magnets and mounted on a shaft?

**14.** Which of the following is the cause of meter phase error in induction type energy meter?

- Incorrect position of brake magnets.
- Incorrect adjustment of the position of shading bands.
- Slow but continuous rotation of aluminium disc.
- Temperature variations.

**15.** The disadvantage of time measurement testing in energy meters is

- Accuracy variation due to test load
- Need continuous Monitoring
- Meter constant can’t be determined
- All of the above

**16. **A 230 V single-phase energy meter has a constant load current of 20 A at unity power factor. If the meter disc makes 2300 revolutions for 2 hours, the meter constant will be:

**17.** The kWh meter can be classified as a / an instrument:

- Indicating
- Deflecting
- Digital
- Integrating

**18.** A 230-V, 50-A energy meter on full load test makes 61 revolutions in 37 seconds. If the meter constant is 520 rev/kwh, what is the percentage error?

**19. **If an energy meter makes 5 revolutions in 100 seconds when a load of 225 W is connected, the meter constant is

- 800 rev/kWh
- 222 rev/kWh
- 147 rev/kWh
- 13 rev/kWh

**20.** If an energy meter disc makes 10 revolutions in 10 minutes when a load of 600 W is connected to it, the meter constant in rev / kWh is:

- 100
- 600
- 800
- 200

**21.**** **In short time test of energy meter the other meter used is

- Substandard type
- Standard type
- Either 1 and 2
- Voltmeter