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  • Question

  • When the core of a saturable reactor is saturated, the inductance is high.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    Explanation
    Since core is saturated, change of flux is small and inductance is low.

    More questions

    • 1. The dynamic equalising circuit consists of a series combination of capacitor C and resistor RC across each thyristor. This resistance RC (along with parallel connected diode)

    • Options
    • A. limits charging current
    • B. limits discharging current
    • C. limits both charging and discharging currents
    • D. none of the above
      • Discuss
    • 2. In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is

    • Options
    • A. 750 kHz
    • B. 990 kHz
    • C. 1650 kHz
    • D. 2100 kHz
      • Discuss
    • 3. In a dual converter operated in circulating current mode, the circulating current flows

    • Options
    • A. when load current is zero
    • B. when load current is non-zero
    • C. even when load current is zero
    • D. none of the above
      • Discuss
    • 4. An increase in temperature increases the width of depletion layer.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. In a coaxial cable, braided copper is used for

    • Options
    • A. conductor
    • B. shield
    • C. dielectric
    • D. jacket
      • Discuss
    • 6. Which of the following are donor impurities?

      1. Gold
      2. Phosphorus
      3. Boron
      4. Antimony
      5. Arsenic
      6. Induim
      Select the correct answer using the following codes

    • Options
    • A. 1, 2, 3
    • B. 1, 2, 4, 6
    • C. 3, 4, 5, 6
    • D. 2, 4, 5
      • Discuss
    • 7. The load circuit of a single phase full bridge inverter

    • Options
    • A. must be underdamped
    • B. must be overdamped
    • C. may be underdamped or overdamped
    • D. may be any type of load
      • Discuss
    • 8. Forward rating of an SCR is

    • Options
    • A. the maximum rate of rise of anode voltage which will trigger the SCR
    • B. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is applied
    • C. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is not applied
    • D. either (b) or (c)
      • Discuss
    • 9. Modulated carrier power in FM

    • Options
    • A. increases with modulating signal power
    • B. decreases with modulating signal power
    • C. is independent of the modulating signal power
    • D. none
      • Discuss
    • 10. If ?r is relative permeability, ?r is relative permittivity, c is velocity of light fc is cutoff frequency, phase velocity vp (i.e., speed with which a particular phase of the wave travels down a rectangular waveguide at frequency f) is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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