Home / ECE / Measurements and Instrumentation :: Section 4

ECE :: Measurements and Instrumentation

  1. If A = 131 ± 4 and B = 106 ± 4, the percentage range of doubt in A - B is

  2. A.
    4%
    B.
    8%
    C.
    16%
    D.
    32%

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. Two resistance R1 and R2 are connected in series R1 = 528 ± 5 Ω and R2 = 325 ± 3Ω. The total resistance will be

  4. A.
    853 ± 2 Ω
    B.
    853 ± 5 Ω
    C.
    853 ± 3 Ω
    D.
    853 ± 8 Ω

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. The function of shunt in an ammeter is to

  6. A.
    by pass the current
    B.
    increase sensitivity of meter
    C.
    increase resistance of meter
    D.
    all of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Which of the following does not use the principle of change in inductance?

  8. A.
    LVDT
    B.
    Inductance displacement transducer
    C.
    Strain gauge
    D.
    Reluctance pick up

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a

  10. A.
    phase meter
    B.
    waveform meter
    C.
    vector voltmeter
    D.
    digital voltmeter

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. A sinusoidal signal is measured by CRO. The scale is set at 4 mV/cm. If vertical distance between positive and negative peaks is 6 cm, the peak value of ac signal is

  12. A.
    6 mV
    B.
    12 mV
    C.
    24 mV
    D.
    3 mV

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Wheatstone bridge is suitable for low resistances.

  14. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. To avoid creep in an energy meter

  16. A.
    two shading bands are put on shunt magnet
    B.
    two shading bands are put on series magnet
    C.
    two holes are cut in the disc on opposite sides of spindle
    D.
    the potential coil is made of very thin wire

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. A wire strain gauge has a gauge factor of 2, resistance of 125 Ω and length 1 m. If length of wire changes by .005 m, change in resistance will be

  18. A.
    0.25 Ω
    B.
    0.5 Ω
    C.
    1.25 Ω
    D.
    2.5 Ω

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Four voltmeters have following specifications. If accuracy is main consideration which is the best?

  20. A.
    100 V, 2 mA
    B.
    100 V, 100 mA
    C.
    100 V, 1 mA
    D.
    100 V, 0.1 mA

    View Answer

    Workspace

    Discuss Discuss in Forum