144 + Mcqs in Measurement And Instrumentation Page 1 McqOptions

1.	_____ instruments are those which measure the total quantity of electricity delivered in a particular time.
A.	Absolute
B.	Indicating
C.	Recording
D.	Integrating
Answer» E.

Discussion

2.	The use of _____ instruments is merely confined within laboratories as stand ardizing instruments.
A.	absolute
B.	indicating
C.	recording
D.	integrating
Answer» B. indicating

Discussion

3.	Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
A.	Absolute instruments
B.	Indicating instruments
C.	Recording instruments
D.	Integrating instruments
Answer» C. Recording instruments

Discussion

4.	A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
A.	deflecting
B.	controlling
C.	damping
D.	any of the above
Answer» D. any of the above

Discussion

5.	A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
A.	ammeter
B.	voltmeter
C.	flux-meter
D.	ballistic galvanometer
Answer» B. voltmeter

Discussion

6.	Most common form of A.C. meters met with in every day domestic and industrial installations are
A.	mercury motor meters
B.	commutator motor meters
C.	induction type single phase energy meters
D.	all of the above
Answer» D. all of the above

Discussion

7.	is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
A.	Tangent galvanometer
B.	Meggar
C.	Current transformer
D.	None of the above
Answer» C. Current transformer

Discussion

8.	The ratio of maximum displacement deviation to full scale deviation of the instrument is called
A.	static sensitivity
B.	dynamic deviation
C.	linearity
D.	precision or accuracy
Answer» D. precision or accuracy

Discussion

9.	In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
A.	0.1 Hz
B.	0.25 Hz
C.	0.5 Hz
D.	1.5 Hz
Answer» D. 1.5 Hz

Discussion

10.	In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
A.	out of phase by 90
B.	out of phase by 60
C.	out of phase by 30
D.	out of phase by 0
Answer» B. out of phase by 60

Discussion

11.	The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
A.	single-phase winding
B.	two-phase winding
C.	three-phase winding
D.	any of the above
Answer» C. three-phase winding

Discussion

12.	In a single phase power factor meter the phase difference between the currents in the two pressure coils is
A.	exactly 0
B.	approximately 0
C.	exactly 90
D.	approximately 90
Answer» D. approximately 90

Discussion

13.	In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was
A.	unity
B.	0.8 lagging
C.	0.8 leading
D.	zero
Answer» B. 0.8 lagging

Discussion

14.	To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken
A.	from a source which is not the same as the unknown voltage
B.	from a battery
C.	from the same source as the unknown voltage
D.	any of the above
Answer» D. any of the above

Discussion

15.	When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is
A.	short-circuited
B.	all right
C.	faulty
D.	none
Answer» C. faulty

Discussion

16.	Which of the following devices should be used for accurate measurement of low D.C. voltage ?
A.	Small range moving coil voltmeter
B.	D.C. potentiometer
C.	Small range thermocouple voltmeter
D.	None of the above
Answer» C. Small range thermocouple voltmeter

Discussion

17.	The pressure coil of a wattmeter should be connected on the supply side of the current coil when
A.	load impedance is high
B.	load impedance is low
C.	supply voltage is low
D.	none of the above
Answer» B. load impedance is low

Discussion

18.	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
A.	unity
B.	0.5
C.	0.3
D.	zero
Answer» C. 0.3

Discussion

19.	Which of the following instruments indicate the instantaneous value of the electrical quantitybeing measured at the time at which it is being measured ?
A.	Absolute instruments
B.	Indicating instruments
C.	Recording instruments
D.	Integrating instruments
Answer» C. Recording instruments

Discussion

20.	In a single phase power factor meter the phase difference between the currents in the twopressure coils is
A.	exactly 0°
B.	approximately 0°
C.	exactly 90°
D.	approximately 90°
Answer» D. approximately 90°

Discussion

21.	For measurements on high voltage capacitors, the suitable bridge is
A.	Wein bridge
B.	Modified De Santy's bridge
C.	Schering bridge
D.	Any of the above
Answer» D. Any of the above

Discussion

22.	In an AC. co-ordinate potentiometer, the currents in the phase and quadraturepotentiometer are adjusted to be
A.	out of phase by 90°
B.	out of phase by 60°
C.	out of phase by 30°
D.	out of phase by 0°
Answer» B. out of phase by 60°

Discussion

23.	The ratio of maximum displacement deviation to full scale deviation of the instrument iscalled
A.	static sensitivity
B.	dynamic deviation
C.	linearity
D.	precision or accuracy
Answer» D. precision or accuracy

Discussion

24.	To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supplyfor the potentiometer in taken
A.	from a source which is not the same as the unknown voltage
B.	from a battery
C.	from the same source as the unknown voltage
D.	any of the above
Answer» D. any of the above

Discussion

25.	In a 3-phase power measurement by two wattmeter method, both the watt meters hadidentical readings. The power factor of the load was
A.	unity
B.	0.8 lagging
C.	0.8 leading
D.	zero
Answer» B. 0.8 lagging

Discussion

26.	Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to
A.	improve its ventilation
B.	eliminate creeping at no load
C.	increase its deflecting torque
D.	increase its braking tcrque
Answer» C. increase its deflecting torque

Discussion

27.	Which of the following devices should be used for accurate measurement of low D.C.voltage ?
A.	Small range moving coil voltmeter
B.	D.C. potentiometer
C.	Small range thermocouple voltmeter
D.	None of the above
Answer» C. Small range thermocouple voltmeter

Discussion

28.	A moving-coil permanent-magnet instrument can be used as _____ by using a lowresistance shunt.
A.	ammeter
B.	voltmeter
C.	flux-meter
D.	ballistic galvanometer
Answer» B. voltmeter

Discussion

29.	In a 3-phase power measurement by two wattmeter method the reading of one of thewattmeter was zero. The power factor of the load must be
A.	unity
B.	0.5
C.	0.3
D.	zero
Answer» C. 0.3

Discussion

30.	is an instrument which measures the insulation resistance of an electric circuit relative toearth and one another,
A.	Tangent galvanometer
B.	Meggar
C.	Current transformer
D.	None of the above
Answer» C. Current transformer

Discussion

31.	In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have adifference of
A.	0.1 Hz
B.	0.25 Hz
C.	0.5 Hz
D.	1.5 Hz
Answer» D. 1.5 Hz

Discussion

32.	The use of _____ instruments is merely confined within laboratories as stand¬ardizinginstruments.
A.	absolute
B.	indicating
C.	recording
D.	integrating
Answer» B. indicating

Discussion

33.	The stator of phase shifting transformer for use in conjunction with an A.C. potentiometerusually has a
A.	single-phase winding
B.	two-phase winding
C.	three-phase winding
D.	any of the above
Answer» C. three-phase winding

Discussion

34.	The pressure coil of a wattmeter should be connected on the supply side of the current coilwhen
A.	load impedance is high
B.	load impedance is low
C.	supply voltage is low
D.	none of the above
Answer» B. load impedance is low

Discussion

35.	A _____ device prevents the oscillation of the moving system and enables the latter toreach its final position quickly
A.	deflecting
B.	controlling
C.	damping
D.	any of the above
Answer» D. any of the above

Discussion

36.	Most common form of A.C. meters met with in every day domestic and industrialinstallations are
A.	mercury motor meters
B.	commutator motor meters
C.	induction type single phase energy meters
D.	all of the above
Answer» D. all of the above

Discussion

37.	When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a lowresistance initially and then slowly came to infinity position. This shows that capacitor is
A.	short-circuited
B.	all right
C.	faulty
D.	none
Answer» C. faulty

Discussion

38.	_____ instruments are those which measure the total quantity of electricity delivered in aparticular time.
A.	Absolute
B.	Indicating
C.	Recording
D.	Integrating
Answer» E.

Discussion

39.	For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
A.	One of the wattmeters will read zero
B.	Both give the same readings
C.	One of the wattmeter connections will have to be reversed
D.	Pressure coil of the wattmeter will become ineffective.
Answer» D. Pressure coil of the wattmeter will become ineffective.

Discussion

40.	The absolute measurement of resistance is done by
A.	Ohm’s law method
B.	Bridge Method
C.	Rayleigh method
D.	Lorenz method
Answer» E.

Discussion

41.	No eddy current and hysteresis losses occur in
A.	Electrostatic instruments
B.	PMMC instruments
C.	Moving iron instruments
D.	Electrodynamo meter instruments
Answer» B. PMMC instruments

Discussion

42.	In a gravity controlled instrument, the deflection angle is proportional
A.	Measurand
B.	Square of the measurand
C.	Sine inverse of measurand
D.	Sine of the measurand
Answer» D. Sine of the measurand

Discussion

43.	The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is
A.	Standard ohm
B.	One international ohm
C.	One ohm according to SI units
D.	One ohm according to working standards
Answer» C. One ohm according to SI units

Discussion

44.	The repeat accuracy of an instrument can be judged from its
A.	Static error
B.	Linearity error
C.	Dynamic error
D.	Standard deviation of error
Answer» E.

Discussion

45.	The multiplier and the meter coil in a voltmeter are in
A.	Series
B.	Parallel
C.	Series-parallel
D.	None of the above
Answer» B. Parallel

Discussion

46.	Wagner earthing device is used to eliminate errors due to
A.	Electrostatic coupling
B.	Electromagnetic coupling
C.	Both A and B
D.	None of the above
Answer» B. Electromagnetic coupling

Discussion

47.	A mulliammeter can be used as
A.	Voltmeter and ammeter
B.	Wattmeter
C.	Ohmmeter
D.	Frequency meter
Answer» B. Wattmeter

Discussion

48.	It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?
A.	100W
B.	150W
C.	50W
D.	200W
Answer» C. 50W

Discussion

49.	A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?
A.	5%
B.	6.67%
C.	10%
D.	8.33%
Answer» E.

Discussion

50.	The pressure coil of a wattmeter should be connected on the supply side of the current coil when
A.	Load impedance is high
B.	Load impedance is low
C.	Supply voltage is low
D.	None of the above
Answer» B. Load impedance is low

Discussion

Explore topic-wise MCQs in Electrical Engineering.

_____ instruments are those which measure the total quantity of electricity delivered in a particular time.

The use of _____ instruments is merely confined within laboratories as stand ardizing instruments.

Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly

A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.

Most common form of A.C. meters met with in every day domestic and industrial installations are

is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,

The ratio of maximum displacement deviation to full scale deviation of the instrument is called

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of

In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

In a single phase power factor meter the phase difference between the currents in the two pressure coils is

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken

When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is

Which of the following devices should be used for accurate measurement of low D.C. voltage ?

The pressure coil of a wattmeter should be connected on the supply side of the current coil when

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

Which of the following instruments indicate the instantaneous value of the electrical quantitybeing measured at the time at which it is being measured ?

In a single phase power factor meter the phase difference between the currents in the twopressure coils is

For measurements on high voltage capacitors, the suitable bridge is

In an AC. co-ordinate potentiometer, the currents in the phase and quadraturepotentiometer are adjusted to be

The ratio of maximum displacement deviation to full scale deviation of the instrument iscalled

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supplyfor the potentiometer in taken

In a 3-phase power measurement by two wattmeter method, both the watt meters hadidentical readings. The power factor of the load was

Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to

Which of the following devices should be used for accurate measurement of low D.C.voltage ?

A moving-coil permanent-magnet instrument can be used as _____ by using a lowresistance shunt.

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

is an instrument which measures the insulation resistance of an electric circuit relative toearth and one another,

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have adifference of

The use of _____ instruments is merely confined within laboratories as stand¬ardizinginstruments.

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometerusually has a

The pressure coil of a wattmeter should be connected on the supply side of the current coilwhen

A _____ device prevents the oscillation of the moving system and enables the latter toreach its final position quickly

Most common form of A.C. meters met with in every day domestic and industrialinstallations are

When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a lowresistance initially and then slowly came to infinity position. This shows that capacitor is

_____ instruments are those which measure the total quantity of electricity delivered in aparticular time.

For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

The absolute measurement of resistance is done by

No eddy current and hysteresis losses occur in

In a gravity controlled instrument, the deflection angle is proportional

The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is

The repeat accuracy of an instrument can be judged from its

The multiplier and the meter coil in a voltmeter are in

Wagner earthing device is used to eliminate errors due to

A mulliammeter can be used as

It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?

A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?

The pressure coil of a wattmeter should be connected on the supply side of the current coil when