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

Question: Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?

• 1. 49dB
• 2. 51dB
• 3. 98dB
• 4. 102dB

Question: The cascade amplifier is a multistage configuration of__________?

• 1. CC-CB .
• 2. CE-CB
• 3. CB-CC
• 4. CE-CC

Question: The encapsulation of transistor is necessary for__________?

• 1. preventing radio interference
• 2. preventing photo-emission effects
• 3. avoiding loss of free electrons
• 4. mechanical ruggedness

Question: In all base driver amplifiers__________?

• 1. ac collector voltage is 180° out of phase with ac base voltage
• 2. ac emitter voltage is 180° out of phase with ac base voltage
• 3. ac collector voltage is in phase with ac base voltage
• 4. none of the above

Question: The parameter hie stands for input impedance in _____________?

• 1. CB arrangement with output shorted
• 2. CC arrangement with output shorted
• 3. CE arrangement with output shorted
• 4. None of the above