Important Question Answer For HPSSC Electrician Exam Set-11

||Important Subject Related Question Answer For HPSSC Electrician Exam Set-11||Important Question Answer For HPSSSB Hamirpur Electrician Exam Set-11||

1. The most commonly used amplifier in sample & hold circuits is

A. A unity gain inverting amplifier

B. A unity gain non-inverting amplifier

C. An inverting amplifiers with a gain of 100

D. An inverting amplifier with a gain of 10

2. 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. 1/5KΩ

B. 1/11KΩ

C. 11KΩ

D. 5KΩ

3. In a common emitter, unbypassed resister provides

A. current series feedback

B. voltage shunt feedback

C. positive current feedback

D. negative voltage feedback

4. 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. 0.5

B. 0.25

C. 1

D. 0.75

5. The current gain of a BJT is

A. gm / r0

B. gm r0

C. gm /rπ

D. gm rπ

6. The current gain of a bipolar transistor drops at high frequencies because of

A. High current effects in the base

B. Transistor capacitances

C. The early effect

D. Parasitic inductive elements

7. 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

A. 395mV

B. 795mV

C. 39.5mV

D. 79.5 mV

8. Generally, the gain of a transistor amplifier falls at high frequencies due to the

A. Coupling capacitor at the input

B. Internal Capacitance of the device

D. Coupling capacitor at the output

C. Skin effect

9. MOSFET can be used as a

A. Voltage controlled capacitor

B. Current controlled capacitor

C. Voltage controlled inductors

D. Current controlled inductor

10. Voltage Series (feedback also called series-shunt feedback) results in

A. Decreases in both input & output impedances

B. Increase in both input & output impedances

C. Decrease in input impedance & increase in output impedance

D. Increase in input impedance & decreases in output impedance

||Important Subject Related Question Answer For HPSSC Electrician Exam Set-11||Important Question Answer For HPSSSB Hamirpur Electrician Exam Set-11||

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