Q.1

An induction wattmeter can be used for ac only.

  • True
  • False
Q.2

Loading effect is primarily caused by instruments having

  • high resistance
  • high sensitivity
  • low sensitivity
  • high range
Q.3

Capacitive transducer is superior to inductive type for measurement of capacitance because of

  • absence of non-linearity
  • high frequency response
  • small size
  • high accuracy
Q.4

In Weston synchronoscope the fixed coils are connected across

  • bus bars
  • incoming alternator
  • lamp
  • either (a) or (b)
Q.5

Which of the following is not a transducer in true sense?

  • Thermocouple
  • Piezo electric
  • Photo electric cell
  • LCD
Q.6

Which of the following can be used for measuring capacitance?

  • De sauty bridge
  • Maxwell's bridge
  • Anderson bridge
  • Hay's bridge
Q.7

Consider the following statements about mutual inductances:

  1. The value should remain constant under all conditions.
  2. The mutual inductance should not vary with temperature.
  3. The inductance should be independent of excitation.
  4. They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range.
Out of the above, correct statement are
  • 2, 3, 4
  • 1, 2, 3
  • 1, 3, 4
  • 1, 2, 4
Q.8

The total insulation resistance consists of insulation volume resistance and surface leakage resistance.

  • True
  • False
Q.9

Assertion (A): Energy meters use induction principle.

Reason (R): Induction wattmeter is less accurate than a dynamometer wattmeter.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.10

The phenomenon of creep occurs in

  • energy meters
  • voltmeters
  • ammeters
  • wattmeters
Q.11

Magnetic deflection sensitivity is defined as

  • deflection/flux density
  • (deflection/flux density)0.5
  • (Deflection)0.5/flux density
  • none of the above
Q.12

Which of the following is active transducer?

  • Photoelectric
  • Photovoltaic
  • Photoconductive
  • Photoemissive
Q.13

The dimensions of permittivity are

  • L-3M-1T2Q2
  • L-1M-1T2Q2
  • L2MT-1Q-1
  • L-2M-1T2Q2
Q.14

The sensitivity of a potentiometer can be increased by

  • increasing the length of wire
  • decreasing the length of wire
  • increasing the current in the wire
  • decreasing the current in the wire
Q.15

The coding system generally used in digital telemetry is

  • PPM (Pulse position modulation)
  • PAM (Pulse amplitude modulation)
  • PCM (Pulse code modulation)
  • PDM (Pulse duration modulation)
Q.16

Assertion (A): A dc potentiometer measures the true open circuit emf of a source.

Reason (R): At balance point, a dc potentiometer does not draw any current from the source.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.17

Wagner earthing device is used to eliminate error due to

  • electromagnetic coupling
  • electrostatic coupling
  • both electrostatic and electromagnetic coupling
  • either (a) or (b)
Q.18

RTD is generally suitable for temperature up to

  • about 800°C
  • about 1500°C
  • about 200°C
  • about 50°C
Q.19

The adjustment of position of shading bands, in an energy meter, is done to provide

  • friction compensation
  • creep compensation
  • braking torque
  • none of the above
Q.20

Shaft encoder is used to measure

  • angular position
  • linear position
  • linear velocity
  • linear acceleration
Q.21

Assertion (A): Hay's bridge in particularly suitable for measuring inductance having a comparatively low resistance.

Reason (R): In Hay's bridge the value of frequency supply must be known.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.22

To measure a resistance of about 8 ohms we should use

  • Kelvin's double bridge
  • Wheatstone bridge
  • Meggar
  • Either (b) or (c)
Q.23

Which of the following effects is used in measurement of magnetic flux?

  • Hall effect
  • Seeback effect
  • Piezo electric effect
  • Photoelectric effect
Q.24

The range of RTD using platinum is about

  • -100° C to 700°C
  • -200°C to 1000°C
  • 100°C to 1000°C
  • about 500°C
Q.25

To avoid the effect of stray magnetic fields in ac bridge we can use

  • magnetic screening
  • Wagner earthing device
  • wave filter
  • transformer
Q.26

The resistance of voltmeter affects the accuracy of measurement in loss of charge method.

  • True
  • False
Q.27

Assertion (A): In a CRT, grid is kept at negative potential with respect to cathode.

Reason (R): The function of grid in an electronic tube is to control the number of electrons.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.28

A dynamometer wattmeter can be used for

  • dc only
  • ac only
  • dc and 50 Hz ac
  • dc and high frequency ac
Q.29

A D' Arsonval galvanometer is a

  • moving coil instrument
  • moving iron instrument
  • dynamometer instrument
  • induction instrument
Q.30

Assertion (A): When frequencies of signals fed to X and Y plates of CRO are multiples of each other, Lissajous pattern is displayed on screen.

Reason (R): In a CRO, the vertical deflection is proportional to voltage applied to Y plates.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.31

The device having highest photo sensitivity is

  • photoconductive cell
  • photovoltaic cell
  • photodiode
  • phototransistor
Q.32

Which of the following closely represents the resistance-temperature characteristics of thermistor?

  • RT = a R0 eb/t
  • RT = a R0 E-b/t
  • RT = - a R0 e-b/t
  • RT = - R0 eb/t
Q.33

Consider the following statements regarding electro-dynamometer type indicating instrument
It can be used for measuring

  1. Direct current
  2. Alternating current
  3. Direct voltage
  4. Alternating voltage
Of these statements
  • 1 and 2 are corect
  • 3 and 4 are correct
  • 1 and 3 are correct
  • 1, 2, 3, 4 are correct
Q.34

Which of these instruments has highest power consumption?

  • Dynamometer
  • Electrostatic
  • Moving coil
  • Hot wire
Q.35

For measuring temperatures below 800°C with high accuracy, the best instrument is

  • optical pyrometer
  • thermistor based thermometer
  • GaAs junction diode thermometer
  • platinum resistance thermometer
Q.36

Panel instruments are generally mounted vertically.

  • True
  • False
Q.37

A digital voltmeter has a 4 1/2 digit display. The 1 V range can measure voltage up to

  • 0.9999 V
  • 1.9999 V
  • 0.199 V
  • 9.999 V
Q.38

Consider the following statements as regards induction and dynamometer wattmeters

  1. Dynamometer wattmeters can be used for dc only.
  2. Induction wattmeter has higher torque and dynamometer wattmeter.
  3. Induction wattmeter is less accurate, has more power consumption and more weight than dynamometer wattmeter.
Which of the above statements are correct?
  • 1 only
  • 1 and 2 only
  • 2 and 3 only
  • 1 and 3 only
Q.39

A resistance strain gauge is usually

  • wire grid type
  • foil type
  • any of these
  • none of these
Q.40

In a hot wire instrument, the deflection is proportional to

  • either (a) or (b)
  • peak value of ac current
  • average value of ac current
  • rms value of ac current
Q.41

Schering bridge is used to measure

  • capacitance and dielectric loss
  • inductance
  • resistance
  • mutual inductance
Q.42

A power factor meter has

  • one current and one pressure circuit
  • one current circuit and two pressure circuits
  • two current circuits and two pressure circuits
  • two current circuits and one pressure circuit
Q.43

In portable instruments, damping is provided by

  • spring
  • gravity
  • eddy current
  • either (a) or (c)
Q.44

If A =± 8 and B =±A - B with range of doubt is

  • 498 ± 8
  • 498 ± 4
  • 498 ± 11
  • 498 ± 13
Q.45

Assertion (A): Many instruments use eddy current damping.

Reason (R): Eddy currents set up a magnetic flux which opposes the original movement which generates them.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.46

A Maxwell's bridge has the unknown inductance in one arm and resistance in the other three arms.

  • True
  • False
Q.47

Assertion (A): Secondary instruments require calibration at frequent intervals.

Reason (R): Secondary instruments have many errors.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.48

A permanent magnet moving coil meter can be used as

  • ac only
  • dc only
  • both ac and dc
  • low frequency ac and dc
Q.49

Assertion (A): In a CRT, grid is kept at negative potential with respect to cathode.

Reason (R): The function of grid in an electronic tube is to control the number of electrons.

  • Both A and R are true and R is correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true R is false
  • A is false R is true
Q.50

In a semiconductor strain gauge, the ohmic electrical contacts are generally made of

  • copper wire
  • gold wire
  • aluminium wire
  • nickel wire
0 h : 0 m : 1 s