Question: 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

Question: The action of JFET in its equivalent circuit can best be represented as a_____________?

• 1. Current controlled Current source
• 2. Current controlled voltage source
• 3. Voltage controlled voltage source
• 4. voltage controlled current source

Question: In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?

• 1. Vdc = Vm/π, PIV=2Vm
• 2. Vdc = 2Vm/π, PIV=2vm
• 3. Vdc = 2Vm/π, PIV=Vm
• 4. Vdc = Vm/π, PIV=Vm

Question: The most commonly used amplifier in sample & hold circuits is______________?

• 1. A unity gain non-inverting amplifier
• 2. A unity gain inverting amplifier
• 3. An inverting amplifier with a gain of 10
• 4. An inverting amplifiers with a gain of 100

Question: Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?

• 1. Only the temperature
• 2. only the β of the transistor
• 3. Both Temperature & β
• 4. None of the above

Question: In a CB amplifier the maximum efficiency could be____________?

• 1. 99%
• 2. 85%
• 3. 50%
• 4. 25%

Question: The horizontal intercept of dc load line is the same as ideal____________?

• 1. cut off point
• 2. saturation point
• 3. operating point
• 4. quasi saturation point

Question: Which of the following amplifier circuit using junction transistor has the best gain?

• 1. Common base
• 2. Common emitter
• 3. Common collector
• 4. All have the same gain

Question: MOSFET can be used as a__________?

• 1. current controlled capacitor
• 2. voltage controlled capacitor
• 3. current controlled inductor
• 4. voltage controlled inductors

Question: A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?

• 1. 2
• 2. 1
• 3. 1/2
• 4. 0