Electronic Energy Meter, Adjustments in Single Phase Energy meters

Electrical Measurements

This set of Electrical Measurements Questions and Answers for Experienced people focuses on “Electronic Energy Meter, Adjustments in Single Phase Energy meters”.

1. An electronic energy meter makes use of ___________
a) IC
b) Transformer
c) CRO
d) Multimeter

2. Measurement of energy involves _________
a) inductance and capacitance measurement
b) power consumption and time duration
c) resistance measurement and voltage drop
d) current consumption and voltage drop

3. Average power is _________
a) product of voltage and current
b) product of average current and voltage
c) product of instantaneous voltage and current
d) product of absolute voltage and current

4. What is the role of a multiplier?
a) it multiplies the voltage and current
b) divides the alternating voltage and current
c) supplies instantaneous voltage and current
d) multiplies alternating voltage and current

5. Frequency of oscillation in an electronic energy meter depends on __________
a) output current of multiplier
b) output voltage of multiplier
c) output power of multiplier
d) input resistance of multiplier

6. Analog signal is converted _________
a) into oscillations
b) into digital
c) into pulses
d) into current

7. An electronic energy meter is advantageous compared to conventional ones.
a) True
b) False

8. Energy meter can be directly used in measurement.
a) True
b) False

9. Creeping in an energy meter can be found using _________
a) creep adjustment
b) preliminary light load adjustment
c) full load u.p.f adjustment
d) light load adjustment

10. Preliminary light load adjustment involves _________
a) applying rated voltage across current coil
b) making use of a light load
c) applying rated voltage across pressure coil
d) adjusting the light load

11. Creep adjustment involves _________
a) adjusting the creep
b) exciting the current coil
c) adjusting the turns ratio
d) exciting the pressure coil

12. Light load adjustment involves _________
a) applying rated voltage across the pressure coil
b) adjusting a light load
c) applying rated current across the transformer
d) applying rated voltage across the current coil

13. Low power factor adjustment involves _________
a) adjusting the power factor at lower loads
b) applying rated voltage to pressure coil and a p.f. of 0.5 for current coil
c) only applying rated voltage to pressure coil
d) only a p.f. of 0.5 for the current coil

14. Full load u.p.f adjustment involves _________
a) adjusting the loads at unity power factor
b) applying rated voltage to pressure coil and a p.f. of unity for current coil
c) only applying rated voltage to pressure coil
d) only a p.f. of unity for the current coil

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