FPSC Assistant Executive Engineer (Electrical) Test

Measurements & Instrumentation (copied from www.careerride.com)

1. The damping force in an instrument can be produced by air friction, eddy currents and fluid friction. Which among the three is most efficient?

A. Air friction
B. Eddy current ✓
C. Fluid friction
D. All are equally efficient

2. The instrument which can be used only with the d.c. supply is

A. Permanent magnet type instrument ✓
B. Electrodynamometer instrument
C. Hot-wire instrument
D. Split phase induction type instrument

3. The moving system in the indicating instruments is subjected to

A. Deflecting torque
B. Controlling torque
C. Damping torque
D. All the above ✓