Home / ECE / Analog Electronics :: Section 14

ECE :: Analog Electronics

  1. Assertion (A): In class A amplifier the distortion is minimum

    Reason (R): In class A amplifier collector current exists for 360° of input cycle

  2. 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

  3. Assertion (A): In a differential amplifier the current through common emitter resistor is called tail current

    Reason (R): CMRR of an op-amp indicates how a differential signal amplified

  4. 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

  5. Quartz crystal has

  6. A.
    very small Q
    B.
    small Q
    C.
    very high Q
    D.
    Q less than 1

  7. The current ICBO

  8. A.
    increases with increases in temperature
    B.
    is normally greater for silicon transistor than germanium transistors
    C.
    mainly depends on the emitter base junction bias
    D.
    depends largely on the emitter doping

  9. Assertion (A): In a push pull circuit each transistor stays in the active region for one half cycle

    Reason (R): A push pull amplifier has low distortion

  10. 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

  11. Which of the following statement is correct?

  12. A.
    A FET is a current controlled device
    B.
    A BJT is always reverse biased
    C.
    The semi-conductor material of the gate in an N-channel JFET is p-type
    D.
    JFET has higher input impedance than MOSFET

  13. In a bipolar transistor at room temperature if the emitter current is doubled the voltage across its base emitter junction

  14. A.
    doubles
    B.
    halves
    C.
    increase by about 20 mV
    D.
    decrease by about 20 mV

  15. Which one of the following power amplifier has the maximum efficiency?

  16. A.
    Class A
    B.
    Class B
    C.
    Class AB
    D.
    Class C

  17. Negative feedback lowers the cut off frequency and increase the upper cut off frequency of amplifier.

  18. A.
    True
    B.
    False

  19. In a single-stage RC coupled common emitter amplifier, the phase shift at the lower 3 dB frequency is

  20. A.
    zero
    B.
    135°
    C.
    180°
    D.
    225°