27 + Mcqs in Measuring Instruments Page 1 McqOptions

1.	A series of capacitance voltmeter can measure:
A.	DC current
B.	AC voltage
C.	DC voltage
D.	AC current
Answer» C. DC voltage

Discussion

2.	Among the following, which meter is regarded as insulation tester?
A.	Megger
B.	Frequency meter
C.	Insulator
D.	Wattmeter
Answer» B. Frequency meter

Discussion

3.	Current is measured using:
A.	Megger
B.	Voltmeter
C.	Thermometer
D.	Ammeter
Answer» E.

Discussion

4.	Differential transformer transducer is used for measurement of
A.	speech and music
B.	displacement
C.	liquid level
D.	temperature
Answer» C. liquid level

Discussion

5.	In a single phase induction type energy meter, maximum torque is produced when the shunt magnetic flux:
A.	Is in phase with the supply voltage
B.	Lags the supply voltage by 45 degrees
C.	Lags the supply voltage by 90 degrees
D.	Leads the supply voltage by 90 degrees
Answer» D. Leads the supply voltage by 90 degrees

Discussion

6.	Current transformer uses:
A.	Toroidal transformer
B.	Step-up transformer
C.	Centre-tap transformer
D.	Step-down transformer
Answer» C. Centre-tap transformer

Discussion

7.	Potential Transformer uses:
A.	Step-up transformer
B.	centre tap transformer
C.	step-down transformer
D.	toroidal transformer
Answer» D. toroidal transformer

Discussion

8.	KVAR meters are used to measure the _______ component of KVA in a three-phase circuit.
A.	Faraday
B.	Lorentz
C.	Biot-Savart's
D.	Wattless
Answer» E.

Discussion

9.	Insulation resistance is measured by which meter?
A.	Oscilloscope
B.	VTVM
C.	Wein bridege
D.	Megger
Answer» E.

Discussion

10.	Among the following which device cannot be used as a safety device?
A.	Fuse
B.	Earth tester
C.	Circuit breaker
D.	ELCB
Answer» C. Circuit breaker

Discussion

11.	Kelvin bridge is used to measure
A.	Current
B.	Capacitance
C.	Inductance
D.	Low resistance
Answer» E.

Discussion

12.	In moving iron instruments, eddy current damping cannot be used as
A.	They have a strong operating field
B.	They are not normally used in vertical position
C.	They need a large damping force, which can only provide by air friction
D.	The introduction of permanent magnet required for eddy current damping would distort the existing weak operating magnetic field
Answer» E.

Discussion

13.	In an electric vehicle, a speedometer displays the speed of the vehicle, whereas a/an ________ displays the speed of the motor:
A.	tachometer
B.	barometer
C.	magnetometer
D.	altimeter
Answer» B. barometer

Discussion

14.	Electrostatic voltmeters are particularly suitable for measuring high voltage because the construction is simplified due to
A.	Large electrostatic forces
B.	Small electrostatic forces
C.	Large value of current
D.	Small value of current
Answer» E.

Discussion

15.	In a measuring instrument, the torque produced by the measurand is called:
A.	Damping torque
B.	Controlling torque
C.	Deflecting torque
D.	Staring torque
Answer» D. Staring torque

Discussion

16.	Frequency can be measured using:
A.	Owen’s bridge
B.	Maxwell’s bridge
C.	Wien’s bridge
D.	Schering’s bridge
Answer» D. Schering’s bridge

Discussion

17.	In a 3-phase system balanced star connected system, how many minimum watt-meters are sufficient to measure the total power?
A.	4
B.	2
C.	1
D.	3
Answer» D. 3

Discussion

18.	How is a Lissajous pattern created?
A.	By drawing two square waves on different axis
B.	By drawing square wave and sine wave on the same axis
C.	By drawing two sine waves which are at right angles to each other
D.	By drawing two sine waves on the same axis
Answer» D. By drawing two sine waves on the same axis

Discussion

19.	In an energy meter the magnitude of flux varies:
A.	Due to the induced EMF in the windings
B.	Due to abnormal currents and voltages
C.	Due to change in the transformer turns
D.	Due to high resistance and inductance
Answer» C. Due to change in the transformer turns

Discussion

20.	Dummy strain gauges are used for
A.	compensation of temperature changes
B.	increasing the sensitivity of bridge in which they are included
C.	compensating for different expansion
D.	calibration of strain gauges
Answer» B. increasing the sensitivity of bridge in which they are included

Discussion

21.	_____ instruments may be used as standard instruments for calibrating deflection instruments.
A.	Analog
B.	Mechanical
C.	Digital
D.	Secondary
Answer» D. Secondary

Discussion

22.	Identify the type of error the instrument shows as in the given figure.
A.	Span Error
B.	Hysteresis Error
C.	Linearity Error
D.	Zero Error
Answer» C. Linearity Error

Discussion

23.	Permanent magnet moving coil instrument can be used in
A.	ac work only
B.	both dc and ac work
C.	dc work only
D.	neither dc nor ac work
Answer» D. neither dc nor ac work

Discussion

24.	In a PMMC instrument, the swamping resistor is used to
A.	Increase the damping of the instrument
B.	Reduce the current within safe limits
C.	Compensate for temperature variations
D.	Increase the full-scale sensitivity
Answer» D. Increase the full-scale sensitivity

Discussion

25.	If one of the control springs of a permanent magnet coil ammeter is broken, then on being connected it will read.
A.	Zero
B.	Half of the correct value
C.	Twice the correct value
D.	An infinite value
Answer» B. Half of the correct value

Discussion

26.	An average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave. If a square wave voltage of peak amplitude of 100 V is measured using this voltmeter, what will be the reading indicated by the meter?
A.	111 V
B.	100 V
C.	90.09 V
D.	70.7 V
Answer» B. 100 V

Discussion

27.	A 60 microampere meter has a resistance of 100 ohms. If the meter has to measure 100 mA, then the value of current through the shunt is
A.	100 mA
B.	99.2 mA
C.	99.9 mA
D.	150 mA
Answer» D. 150 mA

Discussion

Explore topic-wise MCQs in Electrician And Wireman.

A series of capacitance voltmeter can measure:

Among the following, which meter is regarded as insulation tester?

Current is measured using:

Differential transformer transducer is used for measurement of

In a single phase induction type energy meter, maximum torque is produced when the shunt magnetic flux:

Current transformer uses:

Potential Transformer uses:

KVAR meters are used to measure the _______ component of KVA in a three-phase circuit.

Insulation resistance is measured by which meter?

Among the following which device cannot be used as a safety device?

Kelvin bridge is used to measure

In moving iron instruments, eddy current damping cannot be used as

In an electric vehicle, a speedometer displays the speed of the vehicle, whereas a/an ________ displays the speed of the motor:

Electrostatic voltmeters are particularly suitable for measuring high voltage because the construction is simplified due to

In a measuring instrument, the torque produced by the measurand is called:

Frequency can be measured using:

In a 3-phase system balanced star connected system, how many minimum watt-meters are sufficient to measure the total power?

How is a Lissajous pattern created?

In an energy meter the magnitude of flux varies:

Dummy strain gauges are used for

_____ instruments may be used as standard instruments for calibrating deflection instruments.

Identify the type of error the instrument shows as in the given figure.

Permanent magnet moving coil instrument can be used in

In a PMMC instrument, the swamping resistor is used to

If one of the control springs of a permanent magnet coil ammeter is broken, then on being connected it will read.

An average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave. If a square wave voltage of peak amplitude of 100 V is measured using this voltmeter, what will be the reading indicated by the meter?

A 60 microampere meter has a resistance of 100 ohms. If the meter has to measure 100 mA, then the value of current through the shunt is