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ECE :: Measurements and Instrumentation

Measurements and Instrumentation - Section 1
Measurements and Instrumentation - Section 2
Measurements and Instrumentation - Section 3
Measurements and Instrumentation - Section 4
Measurements and Instrumentation - Section 5
Measurements and Instrumentation - Section 6
Measurements and Instrumentation - Section 7
Measurements and Instrumentation - Section 8
Measurements and Instrumentation - Section 9
Measurements and Instrumentation - Section 10
Measurements and Instrumentation - section-11
Measurements and Instrumentation - Section-12

  1. Assertion (A): Thermocouple instruments can be used for ac only.

    Reason (R): Thermocouple instrument has a non linear scale.

    2. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true but R is not correct explanation of A
    C.
    A is true R is false
    D.
    A is false R is true

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  2. A meter has a resistance of 1 Ω and full scale deflection current of 1 mA. To convert into an ammeter of 1 A range, the shunt resistance should be

    3. A.
    1000 Ω
    B.
    1 Ω
    C.
    0.01 Ω
    D.
    0.001 Ω

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  3. Two wattmeter method is suitable only for balanced loads.

    4. A.
    True
    B.
    False

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  4. A rectifier voltmeter using bridge rectifier and PMMC meter is calibrated to read rms value of sine wave. A triangular wave is applied to it and it reads 6.82 V. The rms value of triangular wave is

    5. A.
    about 6.82 V
    B.
    about 7.1 V
    C.
    about 6.5 V
    D.
    about 10 V

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  5. A radiation thermometer is suitable for temperatures

    6. A.
    below 500°C
    B.
    below 100°C
    C.
    above 500°C
    D.
    above 1400°C

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  6. Consider the following statements

    1. Thermistor is more sensitive than platinum resistance thermometer
    2. The resistance of thermistor is solely a function of its absolute temperature whether the source of heat is external or internal
    3. Thermistor has linear temperature-resistance relationship
    4. Thermistor has linear negative temperature coefficient
    Of the Statements, the correct statements are

    7. A.
    1 and 2
    B.
    3 and 4
    C.
    1, 2, 3, 4
    D.
    1, 2 and 4

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  7. A moving coil meter has 10 Ω resistance and requires 40 mA for full scale deflection. The shunt resistance required to convert it into 0-2 A ammeter is

    8. A.
    0.1021 Ω
    B.
    0.2041 Ω
    C.
    0.256 Ω
    D.
    0.4210 Ω

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  8. Which of the following instruments can be used for dc as well ac upto a few MHz?

    1. Moving iron instrument
    2. Thermocouple instrument
    3. Induction instrument
    4. Moving coil instrument
    Select the correct answer as per following codes

    9. A.
    2 only
    B.
    2 and 3 only
    C.
    1, 2 and 3 only
    D.
    2 and 4 only

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  9. Assertion (A): Strain measurement using strain gauge invariably requires a dummy strain gauge.

    Reason (R): The resistance of strain gauge depends on temperature.

    10. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true but R is not correct explanation of A
    C.
    A is true R is false
    D.
    A is false R is true

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  10. If a shunt of 200 Ω resistance is used with a galvanometer of 1000 Ω resistance, the multiplying power is

    11. A.
    6
    B.
    5
    C.
    1/5
    D.
    1/6

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