200 Important Measurement and instrumentation MCQ Question and Answer | PDF Free Download
1.Torque/weight ratio of an instrument indicates
- Aaccuracy
- Bsensitivity
- Cfidelity
- Dselectivity
2.Meggar is operated by
- AInternal battery
- BAn external voltage source
- CAn internal hand driven generator
- DNone of the above
3.Meggar will give resistance values which
- AIncrease with the speed of the hand driven dynamo
- BDecrease with the speed of the hand driven dynamo
- CRemain constant irrespective of the speed
- DAny of the above
4.Primary of an instrument transformer (C.T.) is connected in
- ASeries with the line
- BParallel with the line
- CAcross two lines
- DAny of the above
5.Vibrating reeds are used in which of the following instruments?
- APower factor meter
- BFrequency meter
- CWattmeter
- DSynchronoscope
6.If voltage supply to the energy meter is more than the rated value, energy meter will run
- ASlow
- BFast
- CEither of the above
- DNone of the above
7.Aluminium is selected as the material for rotating disc of energy meter because
- AIt is good conductor
- BIt is light
- CIt is indigenously available
- DAll of the above reasons
8.For making shunts the material suitable is that which has
- ANegligible thermoelectric e.m.f. with copper
- BSame resistance temperature co-efficient as the coil of the instrument
- CBeen annealed properly so that its resistance does not change with time
- DAll of the above properties
9.Meter ranges are so selected that the indications are obtained near the
- ATop of the scale
- BBottom of the scale
- CMiddle of the scale
- DNone of the above
10.For measuring an unknown electrical quantity, select the meter with
- AHighest range and work down
- BLowest range and work up
- CWith middle range and work up and down on trial and error basis
- DAny of the above
11.Moving iron instruments are rarely used in low power high resistance circuits because of
- AHigh resistance of the coil
- BLow reluctance of magnetic path
- CHigh reluctance of magnetic path
- DNone of the above
12.Scale of an instrument will be uniform if
- ADeflecting torque varies directly as the deflection angle
- BControl torque varies directly as the deflection angle
- CDeflecting torque and Control torque varies directly as the deflection angle.
- DDamping torque varies directly as the deflection angle
13.Swamping resistance is used in a PMMC instrument to
- ACompensate the error due to temperature variations
- BCompensate the error due to strong magnetic field
- CBoth (a) and (b)
- DNone of the above
14.Which of the following instruments may be used to measure DC voltage accurately?
- AMoving iron type instrument
- BMoving coil type instrument
- CElectrodynamic type instrument
- DNone of the above
15.A high resistance is usually connected in series with an electrostatic voltmeter
- ATo render the measurement accurate
- BTo increase the range
- CFor safety reasons
- DNone of the above
16.A milli-ammeter can be used as
- AAn ammeter only
- BA voltmeter
- CBoth voltmeter and ammeter
- DNone of the above
17.The deflection of a hot wire instrument depends on
- AMaximum value of alternating current
- BInstantaneous value of alternating current
- CRMS value of alternating current
- DAverage value of alternating current
18.Which type of instrument is used to measure very small currents of high frequency?
- AInduction type
- BDynamometer type
- CPermanent magnet moving coil type ammeter
- DThermocouple type
19.In which part of the scale does the pointer indicate most accurately?
- AIn the first third of the scale
- BIn the first half of the scale
- CIn about the middle of the scale
- DIn the last third of the scale
20.The accuracy of a meter is determined by ____________ deflection.
- AOne-tenth of full scale
- BOne-fourth of full scale
- CHalf-scale
- DFull-scale