25 MCQ On Measurement And Instrumentation

1.     Which instrument is used for both ac and dc measurements?

1. The Moving iron
2. The Electrodynamometer
3. An Electrostatic Instruments
4. All of these types

Correct Answer is Option (4) :All of these types

2.     Maxwell bridge can be used for measurement of inductance with

1. Higher Q-factor
2. Very small Q-factor
3. Intermediate Q-factor
4. Variations in Q

Correct Answer is Option (3):Intermediate Q-factor

3.     Which type of bridge is utilized to measure freq. of a signal?

1. A Wien bridge
2. An Anderson’s bridge
3. A DesSauty’s bridge
4. Not an option

Correct Answer is Option (1):Wien bridge

4.     The phenomena creeping is observed in

1. A Watt-hour meter
2. A Volt meter
3. An Ammeter
4. The Q meter

Correct Answer is Option (1):A Watt-hour meter

5.     Low resistance in any system is measured

1. by the Wheatstone bridge
2. by the Kelvin double bridge
3. by the Maxwell bridge
4. by the Wien bridge

Correct Answer is Option (2): by the Kelvin double bridge

6.     Thermocouple is a

1. Passive transducer
2. Active transducer
3. Piezoelectric transducer
4. None of these

Correct Answer is Option (2) : Active transducer

7.     Energy meter is an

1. Integrating instrument
2. Recording instrument
3. Indicating instrument
4. None of these

Correct Answer is Option (1) : Integrating instrument

8.     A megger, which is a measurement instrument, is used to measure

1. Low value resistance
2. Medium value resistance
3. High value resistance
4. All of these

Correct Answer is Option (3) :High value resistance

9.     _____ is not an integrating instrument?

1. Ampere-hour meter
2. Watt-hour meter
3. Voltmeter
4. All of these

Correct Answer is Option (2) : Watt-hour meter

10. ______ is not suitable for both ac and dc signal measurements?

1. Dynamometer
2. Electrostatic type
3. Induction type
4. None of these

Correct Answer is Option (3) : Induction type

11. Which bridge is used for freq. measurement?

1. Maxwell bridge
2. Schering bridge
3. Wien bridge
4. Anderson bridge

Correct Answer is Option (3) : Wien bridge

12. The scale of PMMC instrument is

1. Uniform
2. Cramped at the ends
3. linear
4. None of these

Correct Answer is Option (3) : linear

13.  A megger’s function is to

1. Measure voltage
2. Measure current
3. Measure insulation resistance
4. None of these

Correct Answer is Option (3):Measure insulation resistance

14. One useful advantage of PMMC instrument is

1. Low power consumption
2. No hysteresis loss
3. Efficient eddy current damping
4. All of these

Correct Answer is Option (4) : All of these

15.  A repulsion type ammeter when used in an ac circuit, reads

1. Peak value current
2. RMS value current
3. Mean value
4. None of these

Correct Answer is Option (2) : RMS value current

16.  Which following parameter can be measure by using the Maxwell bridge?

1. Value of the unknown Resistor
2. Value of unknown Inductor
3. Value of unknown Capacitor
4. Value of Freq.

Correct Answer is Option (2) : Value of unknown Inductor

17. In a moving iron instrument, 12A current causes a deflection of the needle by 60 degree. A deflection of 15 degree will be obtained by a current of

1. 9A
2. 6A
3. 4A
4. 3A

Correct Answer is Option (2) : 6A

18. An ac voltmeter is used to measure

1. Average value
2. RMS value
3. Peak value
4. Peak to peak value

Correct Answer is Option (2) : RMS value

19.  Which of the characteristics is desirable during any electrical measurement?

1. Accuracy
2. Sensitivity
3. Reproducibility
4. All of these

Correct Answer is Option (4) : All of these

20.  Which measuring instruments is utilized high AC voltage measurements?

1. PMMC voltmeter
2. Moving iron voltmeter
3. Electrostatic voltmeter
4. Hot wire instrument

Correct Answer is Option (3) : Electrostatic voltmeter

21.  In electrodynamometer type wattmeter

1. Current coil is fixed
2. Pressure coil is fixed
3. Both of these are fixed
4. Both of these are movable

Correct Answer is Option (4) : Both of these are movable

22.  Which of the following bridge is preferred for the measurement of inductance having Q factor?

1. Maxwell’s bridge
2. Hay bridge
3. Owen bridge
4. Desauty’s bridge

Correct Answer is Option (2) :Hay bridge

23. Electrostatic type instruments are

1. Ammeters
2. Wattmeter
3. Voltmeters
4. Ohmmeter

Correct Answer –Option (3) : Voltmeters

24.  A moving iron attraction type instrument is made of

1. One moving coil and one iron piece
2. Two moving coils
3. Two iron pieces
4. All of these

Correct Answer is Option (1) : One moving coil and one iron piece

25.  In a chopper type dc voltmeter, the voltage conversion is

1. Ac to DC
2. DC to AC
3. Only AC or DC
4. None of these

Correct Answer is Option (2) : DC to AC

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