BSNL TTA Measurement MCQ

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Attempt Free BSNL TTA Measurement MCQ Here. Read The Important BSNL MCQ From Below.

1) Volt box is a component to

a Extend voltage range
b Measure voltage
c Compare voltage in a box
d None of the above
Ans. a

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

a Electrostatic voltmeter
b Hot wire voltmeter
c Isothermal voltmeter
d Electrodynamic voltmeter
Ans. a

3) Wagner earthing device is used to eliminate errors due to

a Electrostatic coupling
b Electromagnetic coupling
c BOTH OF THESE
d NONE OF THESE
Ans. a

4) If an instrument has cramped scale for larger values, then it follows

a Square law
b Logarithmic law
c Uniform law
d None of these
Ans. b

BSNL TTA Measurement MCQ

5) 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 these
Ans. c

6) An instrument transformer is used to extend the range of

a Induction instrument
b Induction instrument
c Moving coil instrument
d Any of these
Ans. a

7) 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
Ans. c

8) In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at

a 60
b 90
c 120
d 0
Ans. c

BSNL TTA Measurement MCQ

9) In a meggar controlling torque is provided by

a Spring
b Gravity
c Coil
d Eddy current
Ans. c

10) The two pressure coils of a single phase power factor meter have

a The same dimensions and the same number of turns
b The same dimension but different number of turns
c The same number of turns but different dimensions
d None of these
Ans. a

11) The power of a n-phase circuit can be measured by using a minimum of

a (n – 1) wattmeter elements
b N wattmeter elements
c (n + 1) wattmeter elements
d 2n wattmeter elements
Ans. a

12) To avoid the effect of stray magnetic field in A.C. bridges we can use

a Magnetic screening
b Wagner earthing device
c Wave filters
d Any of these
Ans. a

BSNL TTA Measurement MCQ

13) In an energymeter braking torque is produced to

a Safe guard it against creep
b Brake the instrument
c Bring energy meter to stand still
d Maintain steady speed and equal to driving torque
Ans. d

14) 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 these
Ans. a

15) Alternating current is measured by

a Induction ammeter
b Permanent magnet type ammeter
c Electrostatic ammeter
d Moving iron repulsion type voltmeter
Ans. a

16) 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
Ans. b

BSNL TTA Measurement MCQ

17) Wattmeter cannot be designed on the principle of

a Electrostatic instrument
b Thermocouple instrument
c Moving iron instrument
d Electrodynamic instrument
Ans. c

18) The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

a Almost zero
b Low
c High
d Any of these
Ans. c

19) 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 these
Ans. c

BSNL TTA Measurement MCQ

20) In an Anderson bridge, the unknown inductance is measured in terms of

a Known inductance and resistance
b Known capacitance and resistance
c Known inductance
d Known resistance
Ans. b

21) 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
Ans. c

BSNL TTA Measurement MCQ

22) The electrical power to a meggar is provided by

a Battery
b Permanent magnet D.C. generator
c AC. generator
d Any of these
Ans. b

23) Basically a potentiometer is a device for

a Comparing two voltages
b Measuring a current
c Comparing two currents
d Measuring a voltage
Ans. a

24) In order to achieve high accuracy, the slide wire of a potentiometer should be

a As long as possible
b As short as possible
c Neither too small not too large
d Very thick
Ans. a

BSNL TTA Measurement MCQ

25) To measure radio frequency, the suitable frequency meter is

a Weston frequency meter
b Reed vibrator frequency meter
c Hetrodyne frequency meter
d Electrical resonance frequency meter
Ans. c

26) The gravity controlled instrument has crowded scale because current is proportional to

a Balancing weight
b Deflection angle
c Sine of deflection angle
d Cos of deflection angle
Ans. c

BSNL TTA Measurement MCQ