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  • Question

  • AB + AB =


  • Options
  • A. B
  • B. A
  • C. 1
  • D. 0

  • Correct Answer
  • A 

    Explanation
    AB + AB = A(B + B) = A . 1 = A.

    More questions

    • 1. In a 3 phase semiconverter, the dc output voltage for a certain firing angle is 50% of the maximum possible value. The firing angle is

    • Options
    • A. 30°
    • B. 60°
    • C. 90°
    • D. 120°
      • Discuss
    • 2. McMurrary full bridge inverter uses

    • Options
    • A. auxiliary commutation
    • B. complementary commutation
    • C. natural commutation
    • D. any of the above
      • Discuss
    • 3. A single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is v = Vm sin ?t. The thyristor will conduct

    • Options
    • A. from 0 to 180°
    • B. when v > 50 V
    • C. from 0 to 90°
    • D. When v < 50 V
      • Discuss
    • 4. In a single phase full wave regulator feeding an R-L load, the power factor angle of load is ?. The range of control of firing angle a is

    • Options
    • A. 0 ? a ? p
    • B. ? ? a ? p
    • C. 0 ? a ? (p - ?)
    • D. ? ? a ? (p + ?)
      • Discuss
    • 5. The two-transistor model of a thyristor consists of two transistors :

    • Options
    • A. one n-p-n and other p-n-p
    • B. both p-n-p
    • C. both n-p-n
    • D. one n-p-n and other UJT
      • Discuss
    • 6. In a thyristor, the forward breakover voltage

    • Options
    • A. is constant
    • B. may be constant or may depend on gate current
    • C. decreases as gate current is increased
    • D. increases as gate current is increased
      • Discuss
    • 7. A voltage VBB is applied across the terminals of a UJT. The emitter voltage at peak point is

    • Options
    • A. hVBB
    • B. (h + 1) VBB
    • C. hVBB + VD
    • D. VD
      • Discuss
    • 8. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then

    • Options
    • A. Pdc = Pac for all values of firing angles
    • B. Pdc = Pac if firing angle is less than 180°
    • C. Pdc < Pac for all values of firing angles
    • D. Pdc < Pac if firing angle is less than 180°
      • Discuss
    • 10. To make antenna more directional, either its size must be increased or

    • Options
    • A. the number of its feed horns must be increased
    • B. the frequency of its transmission must be increased
    • C. its effective isotropic radiated power (EIRP) must be increased
    • D. its footprint must be increased
      • Discuss

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