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ECE :: Analog Electronics

  1. An ideal op-amp has zero slew rate.

  2. A.
    True
    B.
    False

  3. In a bridge rectifier circuit the rms value of input ac voltage is 10 V. The PIV across each diode is

  4. A.
    7.07 V
    B.
    14.14 V
    C.
    10 V
    D.
    28.28 V

  5. In a half wave diode rectifier circuit the current flows in the load circuit for

  6. A.
    90° in each cycle
    B.
    180° in each cycle
    C.
    270° in each cycle
    D.
    360° in each cycle

  7. In a push pull circuit

  8. A.
    each transistor conducts for 180°
    B.
    each transistor conducts for more than 180° but less than 360°
    C.
    each transistor conducts for less than 180°
    D.
    the period of conduction of each transistor depends on circuit configuration

  9. A transistor with a = 0.9 and ICBO = 10 μA is biased so that IBQ = 90 μA. Then IEQ will be

  10. A.
    5.15 mA
    B.
    5.2 mA
    C.
    5 mA
    D.
    990 mA

  11. In figure, transistor βdc = 100 and LED voltage when it is conducting is 2 V. Then the base current which saturates the transistor is

  12. A.
    18 mA
    B.
    1.8 mA
    C.
    0.18 mA
    D.
    0.018 mA

  13. In figure the dc emitter current of each transistor is about

  14. A.
    4 mA
    B.
    2 mA
    C.
    3 mA
    D.
    1 mA

  15. The input voltage for starting oscillations in an oscillator is caused by

  16. A.
    negative feedback
    B.
    positive feedback
    C.
    noise voltage in resistors
    D.
    a special generator

  17. The current flowing in a certain P-N junction at room temperature is 2 x 10-7 Amp. When a large reverse biased voltage is applied. Calculate the current flowing when 0.1 volts is applied.

  18. A.
    9 μA
    B.
    10 μA
    C.
    2 μA
    D.
    4 μA

  19. In following figure find VDSQ by assuming gate current is negligible for the p-channel JFET. (if IDQ = - 6 mA, RS = 0, VDD = -18 V, RD = 2 kΩ, IDSS = - 10 mA, IPO = - 3 V)

  20. A.
    4 V
    B.
    - 6 V
    C.
    - 10 V
    D.
    6 V