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ECE :: Analog Electronics

  1. FET can used in

  2. A.
    buffer amplifier circuits
    B.
    cascade amplifier circuits
    C.
    digital circuits
    D.
    all of the above

  3. The circuit in figure is

  4. A.
    CE amplifier
    B.
    CB amplifier
    C.
    Constant voltage source
    D.
    Constant current source

  5. Each of two cascaded stages has a voltage gain of 30. The overall gain is

  6. A.
    3
    B.
    9
    C.
    30
    D.
    900

  7. A two stage amplifier has an upper cutoff frequency of 2 MHz and a lower cutoff frequency of 2 MHz and a lower cut off frequency of 30 Hz. If both stages are similar, their individual upper and lower cut off frequencies respectively are

  8. A.
    4 MHz and 60 MHz
    B.
    3 MHz and 20 Hz
    C.
    3 MHz and 60 Hz
    D.
    4 MHz and 20 Hz

  9. A bipolar transistor is a __________ controlled devices whereas a FET is a __________ controlled devices.

  10. A.
    current, voltage
    B.
    current, current
    C.
    voltage, current
    D.
    voltage, voltage

  11. The input impedance of a non-inverting amplifier is very low.

  12. A.
    True
    B.
    False

  13. RC oscillator can be used upto

  14. A.
    1 kHz
    B.
    10 kHz
    C.
    50 kHz
    D.
    100 kHz

  15. In a N-P-N transistor of the emitter junction is reverse biased and collector junction is also reversed biased, the transistor will operate in

  16. A.
    active region
    B.
    saturation region
    C.
    cut-off region
    D.
    inverted region

  17. Wide banding technique is employed in the

  18. A.
    video amplifier of a TV receiver
    B.
    IF amplifier of an FM receiver
    C.
    RF amplifier of an AM receiver
    D.
    input section of a communication receiver

  19. Assertion (A): The maximum efficiency of a class B push pull amplifier is 78.5%

    Reason (R): A current mirror uses a compensating diode in parallel with the emitter diode

  20. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct