Question: When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?

• 1. linear
• 2. active
• 3. nonlinear
• 4. passive

Question: The PIV rating of a crystal diode is _______________ that of equivalent vacuum diode.

• 1. the same as
• 2. lower than
• 3. more than
• 4. none of the above

Question: The leakage current in a crystal diode is due to _________________?

• 1. minority carriers
• 2. majority carriers
• 3. junction capacitance
• 4. none of the above

Question: The reverse current in a diode is of the order of _____________?

• 1. kA
• 2. mA
• 3. μA
• 4. A

Question: In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?

• 1. all resistors
• 2. all transistors
• 3. all inductors
• 4. all capacitors

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