NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Electronics MCQs (Practice_Test 4 of 13)
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- The action of JFET in its equivalent circuit can be represented as a
- Current controlled Current source
- Current controlled Voltage source
- Voltage controlled Voltage source
- Voltage controlled Current source
- Answer: d
- A change in the value of the emitter resistance Re in a differential amplifier
- affects the difference mode gain Ad
- affects the common mode gain Ac
- affects both Ad and Ac
- does not effect either Ad and Ac
- Answer: b
- Generally, the gain of a transistor amplifier falls at high frequencies due to the
- Internal Capacitance of the device
- Coupling capacitor at the input
- Skin effect
- Coupling capacitor at the output
- Answer: a
- In a common emitter, unbypassed resistor provides
- voltage shut feedback
- current series feedback
- negative voltage feedback
- positive current feedback
- Answer: c
- 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 V
- 2 V
- 1.4 V
- 2.8 V
- Answer: b
- Class AB operation is often used in power (large signal) amplifiers in order to
- get maximum effeciency
- Remove even harmonics
- Overcome a crossover distortion
- reducing collector dissipation
- Answer: c
- The bandwidth of an RF tuned amplifier is dependent on
- Q-factor of the tuned O⟋P circuit
- Q-factor of the tuned I⟋P circuit
- Quiescent operating point
- Q-factor of the O⟋P and I⟋P circuits as well as quiescent operating point
- Answer: a
- Most of the linear ICs are based on the two-transistor differential amplifier because of its
- input voltage dependent linear transfer characteristics
- high voltage gain
- high input resistance
- High CMMR
- Answer: d
- Negative feedback in an amplifier
- Reduces gain
- Increase frequency and phase distortion
- Reduces bandwidth
- Increase Noise
- Answer: a
- 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
- 5 ohm & 20%
- 2 5 ohm & 20%
- 5 ohm &16.7%
- 25 ohm & 16.7%
- Answer: b