Question 1

Moving coil instruments are:

Accepted Answer

A)  permanent magnet type
B)  dynamometer type
C)  induction type
D)  permanent magnet and dynamometer typeE) All of the above
F) C) and D)

Question 2

A voltmeter should have

Accepted Answer

A)   low internal resistance
B)   high internal resistance
C)   electrostatic plates
D)   a sensitive amplifierE) B) and C)
F) A) and B)

Question 3

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

Accepted Answer

A)  deflecting
B)  controlling
C)  damping
D)  any of the aboveE) C) and D)
F) A) and C)

Question 4

An ammeter requires a change of 4A in its coil to produce a pointer deflection of 8mm then its sensitivity is

Accepted Answer

A)  2.5 mm/a
B)  2.0 mm/a
C)  0.5 mm/a
D)  none of the aboveE) A) and B)
F) None of the above

Question 5

The spring material used in a spring control device should have the following property.

Accepted Answer

A)  should be non-magnetic
B)  most be of low temperature co-efficient
C)  should have low specific resistance
D)  all of the aboveE) A) and C)
F) A) and B)

Question 6

Electrostatic type instruments are mainly used for measurement of

Accepted Answer

A)  heavy currents
B)  low currents
C)  low voltages
D)  high voltagesE) A) and C)
F) A) and D)

Question 7

Which of the following voltmeter have least power consumption:

Accepted Answer

A)  moving iron
B)  hot-wire
C)  electrostatic
D)  induction typeE) A) and D)
F) B) and C)

Question 8

The deflection torque can be produced by:

Accepted Answer

A)  gravity control
B)  spring control
C)  air friction
D)  magneitcallyE) A) and D)
F) B) and C)

Question 9

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

Accepted Answer

A)  absolute
B)  indicating
C)  recording
D)  integratingE) A) and B)
F) A) and C) D

Question 10

The ratio and phase angle errors in potential transformer may be reduced by

Accepted Answer

A)  increasing the exciting current
B)  increasing the resistance and leakage reactance in the transformer
C)  by not employing turns compensation
D)  none of the aboveE) All of the above
F) C) and D)

Question 11

Which of the following essential features is possessed by an indicating instrument ?

Accepted Answer

A)  deflecting device
B)  controlling device
C)  damping device
D)  all of the aboveE) None of the above
F) B) and D)

Question 12

For increasing the range of an ammeter, connect:

Accepted Answer

A)  a high value resistance in series with the ammeter coil
B)  a high value resistance in parallel with the ammeter coil
C)  a low value resistance in parallel with the ammeter coil
D)  a low value resistance in series with the ammeter coilE) A) and C)
F) None of the above

Question 13

Chemical effect is used for the operation of:

Accepted Answer

A)  voltmeter
B)  ammeter
C)  ampere hour meter
D)  kwh meterE) B) and C)
F) A) and D)

Question 14

Which of the following instruments have least torque/weight ratio:

Accepted Answer

A)  dynamometer type
B)  pmmc
C)  attraction type moving iron
D)  repulsion type moving ironE) A) and C)
F) B) and D)

Question 15

The change in the direction of a compass needle, when a current carrying wire is brought near, is called

Accepted Answer

A)   electromagnetic deflection
B)   electroscopic force
C)  magnetic force
D)   electrostatic forceE) A) and B)
F) A) and C)

Question 16

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

Accepted Answer

A)  absolute
B)  indicating
C)  recording
D)  integratingE) A) and D)
F) A) and C)

Question 17

Fluid friction damping can be used in

Accepted Answer

A)  horizontally mounted instruments
B)  vertically mounted instruments
C)  both horizontally mounted instruments and vertically mounted instruments
D)  none of the aboveE) A) and B)
F) A) and C)

Question 18

The major advantage of electromagnet type meter over a permanent magnet meter is

Accepted Answer

A)   the electromagnet meter costs much less
B)  the permanent magnet meter has a more sluggish coil
C)   the electromagnet meter need not be aligned with the earth's magnetic field
D)   the electromagnet meter is more ruggedE) None of the above
F) B) and D) D

Question 19

Measurement range of a voltmeter can be extended by using:

Accepted Answer

A)  high current resistance
B)  high series resistance
C)  low shunt resistance
D)  low series resistanceE) None of the above
F) A) and B) B

Question 20

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

Accepted Answer

A)  absolute instruments
B)  indicating instruments
C)  recording instruments
D)  integrating instrumentsE) A) and C)
F) None of the above

Exam 1: Electrical Instrumentation

Moving coil instruments are:

Correct AnswerverifiedShow Answer

A voltmeter should have

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An ammeter requires a change of 4A in its coil to produce a pointer deflection of 8mm then its sensitivity is

Correct AnswerverifiedShow Answer

The spring material used in a spring control device should have the following property.

Correct AnswerverifiedShow Answer

Electrostatic type instruments are mainly used for measurement of

Correct AnswerverifiedShow Answer

Which of the following voltmeter have least power consumption:

Correct AnswerverifiedShow Answer

The deflection torque can be produced by:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

The ratio and phase angle errors in potential transformer may be reduced by

Correct AnswerverifiedShow Answer

Which of the following essential features is possessed by an indicating instrument ?

Correct AnswerverifiedShow Answer

For increasing the range of an ammeter, connect:

Correct AnswerverifiedShow Answer

Chemical effect is used for the operation of:

Correct AnswerverifiedShow Answer

Which of the following instruments have least torque/weight ratio:

Correct AnswerverifiedShow Answer

The change in the direction of a compass needle, when a current carrying wire is brought near, is called

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Fluid friction damping can be used in

Correct AnswerverifiedShow Answer

The major advantage of electromagnet type meter over a permanent magnet meter is

Correct AnswerverifiedD

Measurement range of a voltmeter can be extended by using:

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

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D

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D

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B

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