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ECE :: Analog Electronics

  1. Consider the following statements : A clamper circuit

    1. adds or subtracts a dc voltage to a waveform
    2. does not change the waveform
    3. amplifiers the waveform
    Which are correct?

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

  3. In figure v1 = 8 V and v2 = 8 V. Which diode will conduct?

  4. A.
    D1 only
    B.
    D2 only
    C.
    Both D1 and D2
    D.
    Neither D1 nor D2

  5. A forward voltage of 9 V is applied to a diode in series with a 1 kΩ load resistor. The voltage across load resistor is zero. It indicates that

  6. A.
    diode is short circuited
    B.
    diode is open circuited
    C.
    resistor is open circuited
    D.
    diode is either short circuited or open circuited

  7. Which power amplifier can deliver maximum load power?

  8. A.
    Class A
    B.
    Class AB
    C.
    Class B
    D.
    Class C

  9. A CB amplifier has re = 6 Ω, RL = 600 Ω and a = 0.98. The voltage gain is

  10. A.
    100
    B.
    600 x 0.98
    C.
    98
    D.
    6

  11. A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to

  12. A.
    10 ms
    B.
    20 ms
    C.
    50 ms
    D.
    100 ms

  13. Si transistor of following figure has a = 0.9 and ICE= 0, VEE = 5 V and VCC = 13 V, then RE will be if IEQ = 1 mA

  14. A.
    3 kΩ
    B.
    4 kΩ
    C.
    5 kΩ
    D.
    4.3 kΩ

  15. In class C operation of an amplifier circuit, the collector current exists for

  16. A.
    360° of input wave
    B.
    180° of input wave
    C.
    more than 180° of input wave
    D.
    less than 180° of input wave

  17. The 'h' parameters of the circuit shown in the figure are hib = 25 Ω, hfb = 0.999 and hob = 10-6Ω The Voltage gain is

  18. A.
    0.99
    B.
    1.98
    C.
    2.0
    D.
    4

  19. An exponential amplifier has diode in feedback path.

  20. A.
    True
    B.
    False