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ECE :: Measurements and Instrumentation

  1. Pirani gauge is used to measure

  2. A.
    very low pressure
    B.
    high pressure
    C.
    pressure in the range of 1 atmosphere
    D.
    fluid flow

  3. Assertion (A): CRT is the most important component of a CRO.

    Reason (R): When an electron beam strikes the screen of CRT, a spot of light is produced.

  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

  5. A capacitance transducer has two plates each of area 5 mm2. The coil gap is 2 mm. Displacement sensitivity due to change in gap length is

  6. A.
    11.1 pF/cm
    B.
    44.2 pF/cm
    C.
    52.3 pF/cm
    D.
    66.3 pF/cm

  7. Four capacitors are in parallel. Their values are 36.3 μF, 3.85 μF, 34.002 μF and 850 μF with an uncertainty of digit in the last place. The total capacitance in significant figures is

  8. A.
    75.0 μF
    B.
    75.0 ± 0.1 μF
    C.
    75.1 ± 0.1 μF
    D.
    75.002 ± 0.1 μF

  9. In figure, C0 is distributed capacitance and C is tuning capacitor. If C = C1 for fundamental frequency and C = C2 for second harmonic, then C0 =

  10. A.
    B.
    C.
    D.
    C1 - 2C2

  11. If M is mutual inductance between fixed and moving coils and θ is deflection of dynamometer instrument, then

  12. A.
    B.
    θ ∝ M
    C.
    D.
    θ ∝ M2

  13. The switch board instruments

  14. A.
    should be mounted in vertical position
    B.
    should be mounted in horizontal position
    C.
    should be mounted at about 45°
    D.
    should be mounted at about 80°

  15. Radiation pyrometer is used to measure temperature in the range of

  16. A.
    -200 to 500° C
    B.
    0 to 500° C
    C.
    500 to 1200° C
    D.
    1200 to 2500° C

  17. The electromagnets of an induction wattmeter

  18. A.
    are laminated
    B.
    are not laminated
    C.
    may be laminated
    D.
    must not be laminated

  19. In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of

  20. A.
    0.25 Hz
    B.
    0.5 Hz
    C.
    1.25 Hz
    D.
    1 Hz