Measurement and Instrumentation MCQ Questions and Answers for Practice

1. Basically a potentiometer is a device for

1. comparing two voltages
2. measuring a current
3. comparing two currents
4. measuring a voltage

2. Commonly used instruments in power system measurement are

1. induction
2. moving coil or iron
3. rectifier
4. electrostatic

3. Commonly used standard capacitor is

1. spherical type
2. concentric cylindrical type
3. electrostatic type
4. multilayer parallel plate type

4. Damping of the Ballistic galvanometer is made small to

1. get first deflection large
2. make the system oscillatory
3. make the system critically damped
4. get minimum overshoot

5. E.m.f. of a Weston cell is accurately measured by

1. electrostatic voltmeter
2. hot wire voltmeter
3. isothermal voltmeter
4. electrodynamic voltmeter

6. For handling greater currents induction wattmeters are used in conjunction with

1. potential transformers
2. current transformers
3. power transformers
4. either of the above

7. For measurement of inductance having high value, we should use

1. Maxwells bridge
2. Maxwell Wein bridge
3. Hays bridge
4. Any of the above

8. For measurement of mutual inductance we can use

1. Anderson bridge
2. Maxwells bridge
3. Heaviside bridge
4. Any of the above

9. For measurements on high voltage capacitors, the suitable bridge is

1. Wein bridge
2. Modified De Santys bridge
3. Schering bridge
4. Any of the above

10. For measuring a very high resistance we should use

1. Kelvins double bridge
2. Wheat stone bridge
3. Meggar
4. None of the above

11. For measuring current at high frequency we should use

1. moving iron instrument
2. electrostatic instrument
3. thermocouple instrument
4. none of the above

12. If an inductance is connected in one arm of bridge and resistances in the remaining three arms

1. the bridge can always be balanced
2. the bridge cannot be balanced
3. the bridge can be balanced if the resistances have some specific values

13. If an instrument has cramped scale for larger values, then it follows

1. square law
2. logarithmic law
3. uniform law
4. none of the above

14. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is

1. 10°
2. 80°
3. 120°
4. 170°

15. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be

1. unity
2. 0.5
3. 0.3
4. zero