Friction and Overload Compensation

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Friction and Overload Compensation”.

1. Energy meter reads correctly when the ___________
a) torque is small
b) torque is large
c) torque is medium
d) torque is zero

2. Small torque for energy meter is provided __________
a) by a supply
b) by a shading loop
c) by unshaded loop
d) by a transformer

3. Driving torque is small and is adjustable.
a) True
b) False

4. Friction torque is eliminated by _________
a) using lubricating oil
b) by suspending the components in air
c) by adjusting the position of limb
d) by using steel alloy components

5. Frictional errors are dominant in an energy meter.
a) True
b) False

6. At full load, disc __________
a) partially revolves and then stops
b) continuously revolves
c) does not revolve at all
d) revolves in an alternating fashion

7. Self braking torque is _________
a) proportional to cube of load current
b) proportional to load current
c) proportional to square of load current
d) proportional to reciprocal of load current

8. Self braking action is minimised by _________
a) maintaining high speed for disc
b) maintaining medium speed for disc
c) keeping the disc at rest
d) maintaining low speed for disc

9. Overload compensating devices is _________
a) in the form of a magnetic shunt
b) in the form of a series magnet
c) in the form of a transformer
d) in the form of a supply

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