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

Question: In a common emitter, unbypassed resister provides___________?

• 1. voltage shunt feedback
• 2. current series feedback
• 3. negative voltage feedback
• 4. positive current feedback

Question: . If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?

• 1. 2.3mA
• 2. 3.2mA
• 3. 4.6 mA
• 4. 5.2mA

Question: The MOSFET switch in its on-state may be considered equivalent to_____________?

• 1. resistor
• 2. inductor
• 3. capacitor
• 4. battery

Question: An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

• 1. fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
• 2. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
• 3. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
• 4. fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

Question: An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed____

• 1. 795mV
• 2. 395mV
• 3. 795 mV
• 4. 39.5mV