- A. 9.82 ∠-51.3° kΩ
- B. 9.38 ∠-51.3° kΩ
- C. 180 ∠-38.3° kΩ
- D. 19.2 ∠-38.3° kΩ
Analog Electronics
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Referring to the given circuit, find ZTH if VS is 180° V.
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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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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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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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An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is_____
- A. 1/11KΩ
- B. 1/5KΩ
- C. 5KΩ
- D. 11KΩ
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Which of the following statements is false?
- A. Push pull signals are equal and opposite in phase
- B. Class AB operation cannot be used for a push pull audio power output phase
- C. A push pull output transformer has a centre-tapped primary
- D. All of the above
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Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in_____
- A. Only the temperature
- B. only the β of the transistor
- C. Both Temperature & β
- D. None of the above
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The cascade amplifier is a multistage configuration of_____
- A. CC-CB
- B. CE-CB
- C. CB-CC
- D. CE-CC
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The encapsulation of transistor is necessary for_____
- A. Preventing radio interference
- B. Preventing photo-emission effects
- C. Avoiding loss of free electrons
- D. Mechanical ruggedness
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A 741-type OP-amp has a gain-bandwidth product of 1MHz.A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of_____
- A. 50 KHz
- B. 100 KHz
- C. 1000/17 KHz
- D. 1000/7.07 KHz