1) A source follower using an FET usually has a voltage gain which is___________? a. greater than +100 b. slightly less than unity but positive c. exactly unity but negative d. about -10
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2) 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. a. 10 volts b. 5 volts c. 5/1 volts d. 5/2 volts
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3) 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_________? a. CMMR b. Bandwidth c. Slew rate d. Open-loop gain
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4) The effective channel length of a MOSFET in a saturation decreases with increase in___________? a. Gate voltage b. Drain voltage c. Source voltage d. Body voltage
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5) 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___________? a. 0.25 b. 0.5 c. 0.75 d. 1
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6) Class AB operation is often used in power large signal amplifiers in order to_________? a. get maximum efficiency b. remove even harmonics c. overcome a crossover distortion d. reducing collector dissipation
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7) Negative feedback in an amplifier____________? a. Reduces gain b. Increase frequency &phase distortion c. Reduces bandwidth d. Increases noise
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8) The current gain of a bipolar transistor drops at high frequencies because of____________? a. Transistor capacitances b. High current effects in the base c. Parasitic inductive elements d. The early effect
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9) Generally, the gain of a transistor amplifier falls at high frequencies due to the___________? a. Internal Capacitance of the device b. Coupling capacitor at the input c. Skin effect d. Coupling capacitor at the output
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10) The action of JFET in its equivalent circuit can best be represented as a_____________? a. Current controlled Current source b. Current controlled voltage source c. Voltage controlled voltage source d. voltage controlled current source
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