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 isÂ
A. A unity gain inverting amplifierÂ
B. A unity gain non-inverting amplifierÂ
C. An inverting amplifiers with a gain of 100Â
D. An inverting amplifier with a gain of 10Â
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 isÂ
A. 1/5KΩÂ
B. 1/11KΩ
C. 11KΩÂ
D. 5KΩÂ
 3. In a common emitter, unbypassed resister providesÂ
A. current series feedbackÂ
B. voltage shunt feedbackÂ
C. positive current feedbackÂ
D. negative voltage feedbackÂ
 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. 0.25Â Â
C. 1Â
D. 0.75Â
5. The current gain of a BJT isÂ
A. gm / r0
B. gm r0Â Â
C. gm /rπ
D. gm rÏ€Â
6. The current gain of a bipolar transistor drops at high frequencies because ofÂ
A. High current effects in the baseÂ
B. Transistor capacitances Â
C. The early effectÂ
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. 395mVÂ
 B. 795mVÂ
C. 39.5mVÂ
D. 79.5 mVÂ
 8. Generally, the gain of a transistor amplifier falls at high frequencies due to theÂ
A. Coupling capacitor at the inputÂ
B. Internal Capacitance of the deviceÂ
D. Coupling capacitor at the outputÂ
C. Skin effectÂ
9. MOSFET can be used as aÂ
A. Voltage controlled capacitorÂ
B. Current controlled capacitorÂ
C. Voltage controlled inductors
D. Current controlled inductorÂ
 10. Voltage Series (feedback also called series-shunt feedback) results inÂ
A. Decreases in both input & output impedancesÂ
B. Increase in both input & output impedancesÂ
C. Decrease in input impedance & increase in output impedanceÂ
D. Increase in input impedance & decreases in output impedanceÂ
 ||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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