NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Electronics MCQs (Practice_Test 4 of 13)

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  1. The action of JFET in its equivalent circuit can be represented as a
    1. Current controlled Current source
    2. Current controlled Voltage source
    3. Voltage controlled Voltage source
    4. Voltage controlled Current source
    • Answer: d
  2. A change in the value of the emitter resistance Re in a differential amplifier
    1. affects the difference mode gain Ad
    2. affects the common mode gain Ac
    3. affects both Ad and Ac
    4. does not effect either Ad and Ac
    • Answer: b
  3. Generally, the gain of a transistor amplifier falls at high frequencies due to the
    1. Internal Capacitance of the device
    2. Coupling capacitor at the input
    3. Skin effect
    4. Coupling capacitor at the output
    • Answer: a
  4. In a common emitter, unbypassed resistor provides
    1. voltage shut feedback
    2. current series feedback
    3. negative voltage feedback
    4. positive current feedback
    • Answer: c
  5. A constant current signal across a parallel RLC circuits gives an o⟋p of 1.4V at the signal frequency of 3.89kHz. At the frequency of 4 kHz, the o⟋p voltage will be
    1. 1 V
    2. 2 V
    3. 1.4 V
    4. 2.8 V
    • Answer: b
  6. Class AB operation is often used in power (large signal) amplifiers in order to
    1. get maximum effeciency
    2. Remove even harmonics
    3. Overcome a crossover distortion
    4. reducing collector dissipation
    • Answer: c
  7. The bandwidth of an RF tuned amplifier is dependent on
    1. Q-factor of the tuned O⟋P circuit
    2. Q-factor of the tuned I⟋P circuit
    3. Quiescent operating point
    4. Q-factor of the O⟋P and I⟋P circuits as well as quiescent operating point
    • Answer: a
  8. Most of the linear ICs are based on the two-transistor differential amplifier because of its
    1. input voltage dependent linear transfer characteristics
    2. high voltage gain
    3. high input resistance
    4. High CMMR
    • Answer: d
  9. Negative feedback in an amplifier
    1. Reduces gain
    2. Increase frequency and phase distortion
    3. Reduces bandwidth
    4. Increase Noise
    • Answer: a
  10. A dc power supply has no-load voltage of 30V and a full-load voltage of 25V at full-load current of 1A. Its output resistance and load regulation respectively are
    1. 5 ohm & 20%
    2. 2 5 ohm & 20%
    3. 5 ohm &16.7%
    4. 25 ohm & 16.7%
  • Answer: b

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