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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. A direct current can be measured

    2. A.
    directly by dc potentiometer
    B.
    by dc potentiometer in conjunction with a standard resistance
    C.
    by dc potentiometer in conjunction with volt ratio box
    D.
    none of the above

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  2. Consider the following galvanometers

    1. D'Arsonval
    2. Ballistic
    3. Vibration
    Which of these are permanent magnet moving coil instruments?

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

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  3. Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.

    Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.

    4. 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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  4. Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.

    Reason (R): The time base generator develops a saw tooth voltage.

    5. 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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  5. A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

    6. A.
    1 kHz
    B.
    2 kHz
    C.
    4 kHz
    D.
    8 kHz

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  6. If Eb is the potential of accelerating anode, the energy of electrons as they emerge from electron gun is proportional to

    7. A.
    Eb
    B.
    Eb
    C.
    Eb1.5
    D.
    Eb2

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  7. A moving iron instrument has

    8. A.
    two iron vanes, one fixed and one movable
    B.
    two movable iron vanes
    C.
    two aluminium vanes, one fixed and one movable
    D.
    two vanes, one fixed made of Aluminium and the other movable made of iron

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  8. The temperature coefficient of resistance for a thermistor is

    9. A.
    low and negative
    B.
    low and positive
    C.
    high and negative
    D.
    high and positive

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  9. To measure an unknown ac voltage by an ac potentiometer it is desirable that supply for the potentiometer is taken

    10. A.
    from a battery
    B.
    from a source which is not the same as unknown voltage
    C.
    from the same source as the unknown voltage
    D.
    either (a) or (b)

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  10. A linear displacement digital transducer generally uses

    11. A.
    straight binary code
    B.
    BCD
    C.
    gray code
    D.
    hexadecimal code

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