Measurements - Instruments Objective Questions Answers

1. ____ factor is the ratio of total flux to the useful flux in a magnetic circuit:
a) Form factor
b) Leakage
c) Utility
d) Dispersion

B

2. For eliminating the effect of earth capacitance from the bridge network we use:
a) Wagner's earthing device
b) High voltage at low frequency
c) Low voltage at high frequency
d) Campbell-maxwell device

A

3. The most commonly used null deflector in a power frequency ac bridge is a:
a) Vibration galvanometer
b) D'Arsanval galvanometer
c) Ballistic galvanometer
d) Tachometer

A

4. For measuring emf of a standard cell we use:
a) Galvanometer
b) Potentiometer
c) Zener reference
d) Electro-dynamic voltmeter

B

5.Loss of charge method is used to measure:
a) Low R
b) High R
c) Low L
d) High L

B

6. Megger is an instrument used for the measurement of:
a) High resistance and insulation resistance
b) Medium resistance
c) Low resistance
d) Leakage current

A

7. Vibration reeds are employed in:
a) Frequency meter
b) Power factor meter
c) Synchroscope
d) Megger

A

8. Kelvin double bridge is best suited for the measurement of:
a) Inductance
b) Capacitance
c) Low resistance
d) High resistance

C

9. Introduction of dielectric:
a) Increases the capacitance
b) Reduces the breakdown voltage
c) Reduces the mechanical voltage
d) Increases the size of the capacitor

A

10. The material used to make standard resistance is:
a) Manganin
b) Aluminium
c) Nichrome
d) Platinum

A