Online /Mock Test-23

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TOPIC NAME :- ELECTRIC MEASURING INSTRUMENT (BY-N.K.RATHOD) MCQ-3

1) Megger is used to measure

3 points

A) Breakdown voltage of insulation

B) Earth resistance

C) Insulation resistance

D) None of the above

Clear selection

2) Megger is operated by

3 points

A) Internal battery

B) An external voltage source

C) An internal hand driven generator

D) None of the above

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3) Megger will give resistance values which

3 points

A) Increase with the speed of the hand driven dynamo

B) Decrease with the speed of the hand driven dynamo

C) Remain constant irrespective of the speed

D) Any of the above

Clear selection

4) Control springs are made up of

3 points

A) Phosphor bronze

B) Copper

C) Silver

D) Steel

Clear selection

5) Changes in atmospheric temperature-humidity etc. cause ...... errors

3 points

A) Cumulative

B.) systematic

C) Environmental

D) Instrumental

Clear selection

6) An induction meter can handle current up to

3 points

A) 10 A

B) 30 A

C) 60 A

D) 100 A

Clear selection

7) For handling greater currents induction wattmeters are used in conjunction with

3 points

A) Potential transformers

B) Current transformers

C) Power transformers

D) Either of the above

E) None of the above

Clear selection

8) Induction type single-phase energy meters measure electric energy in

3 points

A) kW

B) WhK

C) kWh

D) .VAR

Clear selection

9) The chemical effect of current is used in

3 points

A) D.C. ammeter hour meter

B) D.C. ammeter

C) D.C. energy meter

D) .None of the above

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10) Which of the following properties a damping oil must possess

3 points

A) Must be a good insulator

B) Should be non-evaporating

C) Should not have corrosive action upon the metal of the vane

D) he viscosity of the oil should not change with the temperature

E) All of the above

Clear selection

11) Input impedance of a voltmeter is _________

3 points

a) high

b) low

c) medium

d) zero

Clear selection

12) Input impedance depends on ________

3 points

a) resistance

b) capacitance

c) inductance

d) voltage

Clear selection

13) At high frequencies the capacitive reactance.

3 points

a) is constant

b) increases

c) decreases

d) becomes zero

Clear selection

14) Voltage ranges in a meter are _________

3 points

a) 5-10-15

b) 20-50-100

c) 0.5-1-1.5

d) 1-3-10

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15) Linear meter with 1% accuracy must have ______

3 points

a) 100 divisions

b) 50 divisions

c) 200 divisions

d) 500 divisions

Clear selection

16) Current can be measured effectively by making use of _________

3 points

a) d.c. voltmeter

b) a.c. ammeter

c) d.c. ammeter

d) a.c. voltmeter

Clear selection

17) R.M.S value means ___

3 points

a) root mean square

b) rate mean second

c) root median second

d) rate mode second

Clear selection

18) Measurement of heat power ________

3 points

a) uses a heat sink

b) uses a thermometer

c) uses a thermocouple

d) uses a black body

Clear selection

19) Main disadvantage of a true r.m.s responding voltmeter is ______

3 points

a) presence of transducer

b) presence of thermocouple

c) presence of transformer

d) presence of oscillator

Clear selection

20) Power in a thermocouple is given by _____

3 points

a) Power = E2 rms / Rheater

b) Power = E2 rms

c) Power = Rheater

d) Power =E2 rms × Rheater

Clear selection

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