ONLINE MCQ EE AND ECE-Measurements and Instrumentation Part One

Measurements and Instrumentation Part One

Instructions: Click the answer button to see the correct answer.

  1. To increase Q factor of a coil, the wire should be
    1. long and thin
    2. thin
    3. long
    4. thick

    Answerd

  2. An
    ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale
    reading. The current measured is 5 A. The limiting error is

    1. 2.5%
    2. 5%
    3. 4%
    4. 2%

    Answerb

  3. In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is
    1. 0.5
    2. 0.8
    3. 0
    4. 1

    Answera

  4. In a CRO which of the following is not a part of electron gun
    1. accelerating anode
    2. X – Y plates
    3. cathode
    4. grid

    Answerb

  5. Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?
    1. Voltmeter having sensitivity of 10 kW/V
    2. Voltmeter having a sensitivity of 1 kW/V
    3. None of these
    4. Voltmeter having a resistance of 5 kΩ

    Answera

  6. A
    single phase energy meter has the rating 1200 resolutions/ kWh. If a
    500 W electric gadget is used for 4 hours, the energy meter will make

    1. 2400 revolutions
    2. 2100 revolutions
    3. 1200 revolutions
    4. 1800 revolutions

    Answera

  7. Assertion (A): De sauty’s bridge is suitable only for pure capacitor. Reason (R): Capacitors are mostly perfect.
    1. A is false R is true
    2. A is true R is false
    3. Both A and R are true but R is not correct explanation of A
    4. Both A and R are true and R is correct explanation of A

    Answerb

  8. In which of the transformer is the secondary nearly short circuited under normal operating conditions?
    1. Distribution transformer
    2. Power transformer
    3. PT
    4. CT

    Answerd

  9. A
    moving coil instrument has a resistance of 0.6 Ω and full scale
    deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the
    resistance of shunt should be

    1. 0.6 Ω
    2. 0.004 Ω
    3. 0.1 Ω
    4. 0.06 Ω

    Answerb

  10. A
    piezoelectric force transducer has a charge sensitivity of 20 pC/N. It
    is connected to a charge amplifier and overall gain of transducer and
    amplifier is 50 mV/N. The gain of amplifier is

    1. 2.5 mV/pC
    2. 4 mV/pC
    3. 1 mV/pC
    4. 1.5 mV/pC

    Answera

  11. An
    LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5
    V range through a 250 gain amplifier. For a displacement 0.5 mm the
    output of LVDT is 2 mV. The sensitivity of instrument is

    1. 0.5 V/mm
    2. 5 V/mm
    3. 1 V/mm
    4. 0.1 V/mm

    Answerc

  12. Assertion
    (A): When a wattmeter is used for low impedance loads, the pressure
    coil is connected across the load. Reason (R): A wattmeter measures
    apparent power.

    1. A is true R is false
    2. A is false R is true
    3. Both A and R are true but R is not correct explanation of A
    4. Both A and R are true and R is correct explanation of A

    Answera

  13. As per BIS there are how many accuracy classes of instruments.
    1. 2
    2. 6
    3. 8
    4. 5

    Answerc

  14. In
    a ballistic galvanometer, a charge of 100 μC gives a first swing of 25
    angle. The charge required to cause first swing of 50 angle is

    1. 400 μC
    2. 50 μC
    3. 200 μC
    4. 25 μC

    Answerc

  15. Two resistors R1 = 36 Ω plus,minus 5% and R2 = 75 Ω plus,minus 5% are connected in series. The total resistance is
    1. 111 plus,minus 7.23 Ω
    2. 111 plus,minus 5.55 Ω
    3. 111 plus,minus 2.778 Ω
    4. 111 plus,minus 0 Ω

    Answerb

  16. In a strain measuring device using a strain gauge, the output quantity is
    1. resistance
    2. impedance
    3. voltage
    4. all of these

    Answerc

  17. The
    Lissajous pattern observed on screen of CRO is a straight line inclined
    at 45 angle to x axis. If X-plate input is 2 sin ωt, the Y-plate input
    is

    1. 2 sin ωt
    2. 2 sin (ωt – 45)
    3. 2√2 sin ωt + 45)
    4. 2 sin (ωt + 45)

    Answera

  18. The angle δ for a mica capacitor is about
    1. 5
    2. 1
    3. 15
    4. 25

    Answerb

  19. A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is
    1. 0.01 V
    2. 1 V
    3. 1 mV
    4. 1 μV

    Answerc

  20. The
    coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm
    wide. The control torque is 240×10⁻⁶ N-m on full scale. If B = 1
    Wb/meters square, range of meter is

    1. 2 mA
    2. 3 mA
    3. 1 mA
    4. 4 mA

    Answera

  21. Consider
    the following statements: In a differential amplifier using JFET, the
    differential output offset is due to-1.mismatch between FET
    parameters,2.difference in values of resistances used in
    circuit,3.variation in supply voltage.Of the statements, the correct
    statements are

    1. 1, 3
    2. 2, 3
    3. 1, 2, 3
    4. 1 and 2

    Answerd

  22. A
    meter with a resistance of 100 Ω and a full scale deflection of current
    of 1 mA is to be converted into voltmeter of 0 – 5 V range. The
    multiplier resistance should be

    1. 4900 Ω
    2. 5100 Ω
    3. 490 Ω
    4. 5000 Ω

    Answera

  23. The household energy meter is
    1. integrating instrument
    2. none of these
    3. indicating instrument
    4. recording instrument

    Answera

  24. A
    standard cell of 1.0185 V is used with a slide wire potentiometer. The
    balance was obtained at 60 cm. When an unknown emf was connected, the
    balance was obtained at 82 cm. The magnitude of unknown emf is

    1. 13.9 V
    2. 0.75 V
    3. 1.39 V
    4. 7.45 V

    Answerc

  25. A
    moving coil instrument has a resistance of 0.5 Ω and a full scale
    deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt
    resistance should be

    1. 0.1 Ω
    2. 0.005 Ω
    3. 0.004 Ω
    4. 0.05 Ω

    Answerb

  26. Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because
    1. it uses centre zero galvanometer instead of Voltmeters
    2. it does not load the circuit at all
    3. it loads the circuit moderately
    4. it loads the circuit to maximum extent

    Answerb

  27. Assertion (A): A hot wire ammeter has a cramped scale.Reason (R): The heat is proportional to square of current.
    1. Both A and R are true but R is not correct explanation of A
    2. A is true R is false
    3. A is false R is true
    4. Both A and R are true and R is correct explanation of A

    Answerd

  28. Which of the following is true about an impulse voltage?
    1. It is a unidirectional voltage
    2. RMS value is always less than 50% of average value
    3. Chopped impulse flash over does not occur
    4. Time taken to rise is equal to time taken to fall

    Answera

  29. Which of the following are needed both for protection and metering?
    1. Power factor meters
    2. Wattmeters
    3. Energy meters
    4. Instrument transformers

    Answerd

  30. A digital frequency counter can be converted to DVM by addition of a suitable
    1. operational amplifier
    2. power amplifier
    3. D/A converter
    4. voltage controlled oscillator

    Answerc

  31. A dynamometer wattmeter is connected in ac circuit. The reading will be
    1. V-A product
    2. average power
    3. instantaneous power
    4. peak power

    Answerb

  32. The speed transducer using a drag cup rotor has the main advantage of
    1. all of these
    2. cheap construction
    3. very high accuracy
    4. low energy requirement

    Answerd

  33. A voltmeter using thermocouples measures
    1. average value
    2. peak value
    3. peak to peak value
    4. rms value

    Answerd

  34. Which of the following measurements using a dc potentiometer do not require standardization of potentiometer?
    1. Measurement of unknown voltage
    2. Calibration of voltmeter
    3. Measurement of resistance
    4. Measurement of unknown current

    Answerc

  35. Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?
    1. Power can be measured by this method only for star connected loads
    2. When two wattmeters have equal readings power factor is 0.5.
    3. When power factor is 1, one of the wattmeters readings is zero
    4. When the two wattmeter read equal and opposite, p.f. is zero

    Answerd

  36. A moving iron instrument gives correct reading when used at
    1. low frequencies
    2. only one frequency
    3. all frequencies upto a certain value
    4. high frequencies

    Answerb

  37. Induction wattmeter can be used in
    1. ac 3 phase only
    2. ac circuit only
    3. dc circuit only
    4. both ac and dc circuit

    Answerb

  38. A dynamometer wattmeter is connected in ac circuit. The measured power is
    1. instantaneous power
    2. rms power
    3. average power
    4. peak power

    Answerc

  39. Loss of charge method is suitable for
    1. high resistances.
    2. all of these.
    3. medium resistances.
    4. low resistances.

    Answera

  40. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
    1. when power factor is less than 0.5 lagging
    2. when power factor is unity
    3. when power factor is less than 0.5
    4. when power factor is greater than 0.5 lagging

    Answerc

  41. It
    is required to measure angular position. Out of the
    transducers-1.Circular potentiometer,2.LVDT,3.E pick up,4.Synchro.The
    proper devices are

    1. 1 and 4
    2. 1, 2, 3, 4
    3. 2 and 3
    4. 1, 2, 4

    Answera

  42. Kelvin’s double bridge is used to measure low resistances because
    1. effect of contact and lead resistances is eliminated
    2. there is no thermoelectric emf
    3. resistance variation due to temperature
    4. it has high sensitivity

    Answera

  43. Assertion (A): Shunt of an ammeter has a low resistance.Reason (R): Shunt may be connected in series or in parallel with ammeter
    1. Both A and R are true but R is not correct explanation of A
    2. Both A and R are true and R is correct explanation of A
    3. A is true R is false
    4. A is false R is true

    Answerc

  44. The scale of hot wire instrument is
    1. both
    2. non linear.
    3. none
    4. linear.

    Answerb

  45. The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is
    1. 2.5
    2. 1
    3. 2
    4. 1.5

    Answerc

  46. If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms
    1. the bridge is balanced for some specific values of R1, R2, R3
    2. the bridge cannot be balanced
    3. the bridge can be balanced
    4. the bridge is balanced for some specified value of frequency

    Answerb

  47. LVDT is a
    1. velocity transducer
    2. acceleration transducer
    3. pressure transducer
    4. displacement transducer

    Answerd

  48. A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is
    1. 2%
    2. 3%
    3. 1.5%
    4. 75%

    Answerc

  49. In Schering bridge, the potential of detector above earth potential is about
    1. 10 KV
    2. 1000 V
    3. a few volts
    4. none of these

    Answerc

  50. Which
    of the following instruments has non-linear scale? 1.Moving coil
    instrument,2.Moving iron instrument,3.Electrostatic
    instrument,4.Rectifier instrument.Select the answer as per following
    codes

    1. 2 and 3 only
    2. 2, 3 and 1
    3. 1, 2, 3 and 4
    4. 2 only

    Answera

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