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ECE :: Analog Electronics

  1. Pick the odd-one out

  2. A.
    Hartley Oscillator
    B.
    Colpitt oscillator
    C.
    Clapp oscillator
    D.
    Weinbridge oscillator

  3. In a CE amplifier the output coupling capacitor is short circuited. The dc collector voltage

  4. A.
    will increase
    B.
    may increase or decrease
    C.
    will remain the same
    D.
    will decrease

  5. A certain transistor has adc of 0.98 and a collectors leakage current of 5 μA. If IE = 1 mA, the collector current will be

  6. A.
    1.005 mA
    B.
    0.985 mA
    C.
    0.975 mA
    D.
    0.955 mA

  7. If 1.5% of the output of an amplifier is feedback positively to the input, the minimum gain required of the amplifier for oscillations to occur, is

  8. A.
    16.6
    B.
    44.4
    C.
    66.6
    D.
    75

  9. The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load

  10. A.
    current is high
    B.
    current is low
    C.
    voltage is high
    D.
    voltage is low

  11. The transconductance curve of a JFET is

  12. A.
    a straight line
    B.
    parabolic
    C.
    hyperbolic
    D.
    inverted V-type

  13. The input resistance R, of an ideal voltage amplifier is __________ and that of a current amplifier is __________ .

  14. A.
    zero, zero
    B.
    infinite, infinite
    C.
    zero, infinite
    D.
    infinite, zero

  15. In CE amplifier circuit, voltage gain is directly proportional to

  16. A.
    β
    B.
    collector supply voltage
    C.
    base resistance
    D.
    none of the above

  17. The heat sink disposes off heat mainly by

  18. A.
    radiation
    B.
    natural convection
    C.
    forced convection
    D.
    conduction

  19. A major advantage of TWT over a Klystron lies in its

  20. A.
    higher bandwidth
    B.
    higher gain
    C.
    higher frequency
    D.
    higher output