Question: In an op-amp differentiator:________________?

• 1. the amplitude of output is proportional to rate of change of input
• 2. the amplitude of output is proportional to input
• 3. output occurs when input is finite and constant
• 4. polarity of input and output is the same

Question: The early effect in a bipolar junction transistor is caused by_______________?

• 1. fast turn-on
• 2. fast turn-off
• 3. large collector-base reverse bias
• 4. large emitter-base forward bias

Question: A source follower using an FET usually has a voltage gain which is___________?

• 1. greater than +100
• 2. slightly less than unity but positive
• 3. exactly unity but negative
• 4. about -10

Question: An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.

• 1. 10 volts
• 2. 5 volts
• 3. 5/1 volts
• 4. 5/2 volts

Question: A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?

• 1. CMMR
• 2. Bandwidth
• 3. Slew rate
• 4. Open-loop gain

Question: The effective channel length of a MOSFET in a saturation decreases with increase in___________?

• 1. Gate voltage
• 2. Drain voltage
• 3. Source voltage
• 4. Body voltage

Question: An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?

• 1. 0.25
• 2. 0.5
• 3. 0.75
• 4. 1

Question: Class AB operation is often used in power large signal amplifiers in order to_________?

• 1. get maximum efficiency
• 2. remove even harmonics
• 3. overcome a crossover distortion
• 4. reducing collector dissipation

Question: Negative feedback in an amplifier____________?

• 1. Reduces gain
• 2. Increase frequency &phase distortion
• 3. Reduces bandwidth
• 4. Increases noise

Question: The current gain of a bipolar transistor drops at high frequencies because of____________?

• 1. Transistor capacitances
• 2. High current effects in the base
• 3. Parasitic inductive elements
• 4. The early effect