Menu
Home / ECE / Analog Electronics :: Section 7

ECE :: Analog Electronics

Analog Electronics - Section 1
Analog Electronics - Section 2
Analog Electronics - Section 3
Analog Electronics - Section 4
Analog Electronics - Section 5
Analog Electronics - Section 6
Analog Electronics - Section 7
Analog Electronics - Section 8
Analog Electronics - Section 9
Analog Electronics - section-1
Analog Electronics - Section 10
Analog Electronics - Section 11
Analog Electronics - Section 12
Analog Electronics - Section 13
Analog Electronics - Section 14
Analog Electronics - Section 15
Analog Electronics - Section 16
Analog Electronics - Section 17
Analog Electronics - Section 18
Analog Electronics - Section 19
Analog Electronics - Section 20
Analog Electronics - Section 21
Analog Electronics - section-22
Analog Electronics - Section-23

  1. Class C amplifier is suitable for

    2. A.
    a narrow frequency band
    B.
    a wide frequency band
    C.
    audio frequencies
    D.
    either (b) or (c)

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in

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

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. A Wien bridge is suitable for

    4. A.
    audio frequencies only
    B.
    radio frequencies only
    C.
    both audio and radio frequencies
    D.
    very low frequencies only

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The noise factor is

    5. A.
    1
    B.
    1.5
    C.
    2.0
    D.
    15

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. Assertion (A): The gain of an FET amplifier can be changed by changing gm

    Reason (R): Most receivers use automatic gain control to counteract changes in volume caused by fading

    6. 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

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. The element in the feedback circuit of a logarithmic amplifier using op-amp is

    7. A.
    a resistor
    B.
    a capacitor
    C.
    an inductor
    D.
    a diode

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. In a FET, gm varies as

    8. A.
    IDS
    B.
    IDS2
    C.
    1/IDS
    D.
    IDS

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. Assertion (A): Class A and Class B amplifier predominate in audio applications.

    Reason (R): Class C amplifier is used at radio frequencies.

    9. 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

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. At midband frequencies the coupling capacitor in RC coupled CE amplifier may be considered as

    10. A.
    open circuit
    B.
    short circuit
    C.
    a reactance equal to load resistance
    D.
    none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What percentage of feedback will cause oscillations?

    11. A.
    0.1%
    B.
    0.5%
    C.
    1%
    D.
    2%

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers