IM/Measuring instruments /Level-1/Practice test -01

1.   1.T he sensitivity of a voltmeter using 0 to 5 mA meter movement is

A)     50 ohm/volt

B)     100 ohm/volt

C)     200 ohm/volt

D)     500 ohm/volt

Ans: D)200 ohm/volt  (1/I_fsd =sensitivity )

2.   

2.2.Which of the following meter is most suitable for measuring radio frequency currents?

A)     Moving-coil meter

B)     Moving-iron meter

C)     Thermocouple meter

D)     VTVM

Ans: C) Thermocouple meter.

Audio frequency measurements VTVM by using rectifier

3.   

3.3. At high frequency the accuracy of all the measuring meters

A)     Increases

B)     Decreases

C)     Remains the same

D)     Depends upon the type of meter

Ans:B) Decreases

4.   4.Megger in its operation in based upon

A)     Moving coil meter

B)     Moving coil meter

C)     Dynamic –meter

D)     Electrostatic meter

Ans: A) Moving coil meter ; It consist of  hand driven generator and a moving coil meter(two coil windings – pressure coil and current coil )

5.   

5.5. Damping provides

A) breaking action on a meter pointer

B) good accuracy

C) starting torque on the meter pointer

D) counter torque to deflection torque

Ans: A) breaking action on a meter pointer