If VBE=0.5V then collector current Icis

1.  7.75 μA

2.  1.6 μA

3.  0.16 μA

4.  77.5 μA

View Answer  
4
Correct Answer :

7.75 μA


Explanation :
No Explanation available for this question

In an amplifier, the power output is 2 W at 5 kHz, and 0.5 W at 50Hz. If the input power is constant at 10 m W, What is the variation (approximate) of power gain in dB at two frequencies(log102~0.30)

1.  6 dB

2.  8 dB

3.  3 dB

4.   16 dBv

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4
Correct Answer :

6 dB


Explanation :
No Explanation available for this question

In bipolar transistor biased in the forward active region, base current is IB=50μA and collector currents is IC=2.7mA.Then α is

1.  0.949

2.  54

3.  0982

4.  0.018

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4
Correct Answer :

0982


Explanation :
No Explanation available for this question

A tuned amplifier has peak output at 2 MHz and quality factor 50. The bandwidth and 3-dB frequencies shall be at what values respectively

1.  40 kHz,2.02 MHz,1.98MHz

2.  40 kHz,2.04 MHz,1.96MHz

3.  80 kHz,2.04MHz,1.96MHz

4.   40 kHz,2.08MHz,1.92MHzv

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4
Correct Answer :

40 kHz,2.04 MHz,1.96MHz


Explanation :
No Explanation available for this question

What is the output voltage V0 of the circuit below

1.  -11 V

2.  6 V

3.  11 V

4.   -6 V

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4
Correct Answer :

-11 V


Explanation :
No Explanation available for this question

The transistor circuit shown in the figure given below is to function as an amplifier. If IC=3 mA, What is the value of VCC approximate

1.  15 V

2.  -15 V

3.  -10 V

4.   -13.5 V

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4
Correct Answer :

-15 V


Explanation :
No Explanation available for this question

An amplifier has an open loop gain of 1000±10. Negative feedback is provided such that the gain variation remains within 0.1%. what is the amount of feedback bF

1.  1/10

2.  1/9

3.  9/100

4.   9/1000

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4
Correct Answer :

9/1000


Explanation :
No Explanation available for this question

The two stages of a cascade amplifier have individual upper cut-off frequencies f1=5 MHz and f2=3.33MHz. What is the best approximation for the upper cut-off frequency of the cascade combination

1.  4.16MHz

2.  3.33MHz

3.  2.5MHz

4.   5.00MHz

View Answer  
4
Correct Answer :

5.00MHz


Explanation :
No Explanation available for this question

A silicon npn bipolar transistor has doping concentration of NE=2*1018cm-3,NB=1017cm-3 and NC=1.5*1016cm-3 The area is 10-3 cm2 and neutral base width is 1μm. The transistor is biased in the active region at VBE=0.5V The collector current is (DB=20cm2/s)

1.  9 μA

2.  17μA

3.  22 μA

4.  11μA

View Answer  
4
Correct Answer :

17μA


Explanation :
No Explanation available for this question

In the circuit shown below, the transformers are centre tapped and the diodes are connected as shown in a bridge. Between the terminals 1 and 2 an a.c. voltage source of frequency 400Hz is connected. Another a.c. voltage of 1.0 MHz is connected between 3 and 4. The output between 5 and 6 contains components at

1.  400Hz, 1.0MHz,1000.4kHz,999.6kHz

2.  400Hz,1000.4kHz,999.6kHz

3.  1MHz,1000.4kHz,999.6kHz

4.   1000.4kHz,999.6kHz

View Answer  
4
Correct Answer :

1000.4kHz,999.6kHz


Explanation :
No Explanation available for this question
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