Pressure Measurement Multiple Choice Questions with Answers

61 In AC bridges, the Wagner earth devices are used to …………….

A Reduce error caused by stray electric field

B Remove harmonics

C Remove all the earth capacitances from the bridge circuit

D All of these

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Answer: All of these

62 The error between the mean of finite data set and mean of infinite data set is known as ………….

A Standard error of the mean

B True error of the mean

C Infinite error

D Finite error

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Answer: Standard error of the mean

63 Resolver works on the principal of mutual inductance variation. It is mainly used for the measurement of ……………

A Rotary motion

B Linear displacement

C Non – linear displacement

D All of these

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Answer: Rotary motion

64 LVDT which is an instrument for the measurement of displacement, works on the principal of ……..

A Mutual inductance

B Linear inductance

C Non – linear inductance

D Linear capacitance

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Answer: Mutual inductance

65 The instruments used for the measurement of pressure is / are …………….

A Bellows

B Diaphragms

C Fiber optic pressure sensors

D All of these

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Answer: All of these

66 The two wattmeters used for the measurement of power input read 50 kW each. What will be the readings of the two wattmeters if the power factor is changed to 0.8 leading keeping the total input power same?

A 31.25W, 73.71W

B 33.33W, 73.33W

C 28.35W, 71.65W

D none of the above

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Answer: 28.35W, 71.65W

67 The Wien’s bridges is suitable for the measurement of frequency of the range of ……….

A 100 Hz to 100 kHz

B Less than 100 Hz

C More than 100 MHz

D 1 kHz to 100 MHz

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Answer: 100 Hz to 100 kHz

68 The frequency errors in induction instruments can be compensated by the use of ………..

A Non inductive shunt in case of ammeters and are generally self compensated in case of voltmeters

B Non inductive shunt in both ammeters and voltmeters

C Self compensated in case of ammeters and non inductive shunt in case of voltmeters

D None of the above

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Answer: Non inductive shunt in case of ammeters and are generally self compensated in case of voltmeters

69 Calibration of instrument is an important consideration in measurement system. The errors due to instruments being out of calibration can be rectified by …………..

A Increasing the temperature coefficient

B Increasing the susceptibility of measuring instrument

C Increasing the frequency of recalibration

D None of these

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Answer: Increasing the frequency of recalibration

70 Instrument which is capable of discriminating temperature differences of even 0.1 degree Celsius is ………..

A Thermography

B Fibre – optic level sensors

C Laser method

D none of the above

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Answer: Thermography

71 Schering bridges are used for the measurement of ………..

A Power factor

B Unknown capacitance

C Dielectric loss

D All of these

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Answer: All of these

72 The AC Bridge which is used for the measurement of frequency is …………

A Wien bridge

B Schering bridge

C Anderson bridge

D Hay’s bridge

View Answer

Answer: Wien bridge

73 Primary current in a current transformer is determined by ………

A The load on its own secondary

B The load on its own primary

C The load on the system

D All of these

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Answer: The load on the system

74 The bridge suitable for the measurement of capacitance is / are ………

A Owen’s bridge

B Anderson’s bridge

C Hay’s bridge

D None of these

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Answer: None of these

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

A voltmeter

B flux-meter

C ammeter

D ballistic galvanometer

View Answer

Answer: ammeter

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

A damping

B controlling

C deflecting

D all of the above

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Answer: all of the above

77 A potentiometer may be used for …………

A measurement of current

B calibration of ammeter

C measurement of resistance

D all of the above

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Answer: all of the above

78 ……………. are not used on D.C. circuits.

A induction meters

B Mercury motor meters

C commutator motor meters

D none of the above

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Answer: induction meters

79 In majority of instruments, damping is provided by ………

A eddy currents

B spring

C fluid friction

D all of the above

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Answer: eddy currents

80 Electrical equipments are generally earthed through an electrode to avoid shocks when someone touches the body of the equipment. The earth resistance is effected by …………..

A Specific resistance of the soil surrounding the electrode

B Shape and material of earth electrodes

C Depth of electrodes buried in the soil

D All of these

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