In majority of instruments damping is provided by______________?

Related Mcqs:

1. The use of _________ instruments is merely confined within laboratories as standardizing instruments?

   A. absolute
   B. indicating
   C. recording
   D. integrating
   E. none of the above

2. Which of the following properties a damping oil must possess ?

   A. Must be a good insulator
   B. Should be non-evaporating
   C. Should not have corrosive action upon the metal of the vane
   D. The viscosity of the oil should not change with the temperature
   E. All of the above

3. The disc of an instrument using eddy current damping should be of________________?

   A. conducting and magnetic material
   B. non-conducting and magnetic material
   C. conducting and non-magnetic material
   D. none of the above

4. Damping of the Ballistic galvanometer is made small to_______________?

   A. get first deflection large
   B. make the system oscillatory
   C. make the system critically damped
   D. get minimum overshoot

5. In a meggar controlling torque is provided by______________?

   A. spring
   B. gravity
   C. coil
   D. eddy current

6. Which of the following devices may be used for extending the range of instruments ?

   A. Shunts
   B. Multipliers
   C. Current transformers
   D. Potential transformers
   E. All of the above

7. According to application, instruments are classified as_____________?

   A. switch board
   B. portable
   C. both A. and B.
   D. moving coil
   E. moving iron
   F. both D. and E.

8. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

   A. Absolute instruments
   B. Indicating instruments
   C. Recording instruments
   D. Integrating instruments

9. The power factor of a single phase load can be calculated if the instruments available are_____________?

   A. one voltmeter and one ammeter
   B. one voltmeter, one ammeter and one wattmeter
   C. one voltmeter, one ammeter and one energy meter
   D. any of the above

10. Commonly used instruments in power system measurement are_______________?

    A. induction
    B. moving coil or iron
    C. rectifier
    D. electrostatic