A npn transistor has a beta cutoff frequency of 1MHz and common emitter short circuit low frequency current gain of 200. Find the gain frequency and alpha cutoff frequency

1.  200MHz, 20MHz

2.  200MHz, 199MHz

3.  199MHz, 200MHz

4.  201MHz, 200MHz

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4
Correct Answer :

201MHz, 200MHz


Explanation :
No Explanation available for this question

A colpitt oscillator has a coil has a coil with an inductance of 50H and is tuned by a capacitor of 500pf across the amplifier input and 200pf across output. Find the frequency of oscillation

1.  3.2MHz

2.  1.88MHz

3.  2.42MHz

4.  None of these

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4
Correct Answer :

1.88MHz


Explanation :
No Explanation available for this question

A colpitt oscillator has a coil has a coil with an inductance of 50H and is tuned by a capacitor of 500pf across the amplifier input and 200pf across output. Hence, find the minimum gain for maintaining oscillation in question no 31

1.  2.4

2.  2.6

3.  2.8

4.  None of these

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4
Correct Answer :

None of these


Explanation :
No Explanation available for this question

Value of R is so chosen, that the circuit just oscillates at angular frequency of. Hence, find ω & R

1.  105rad/s, 2x105

2.  106rad/s, 2x105

3.  2x105rad/s, 2x104

4.  105rad/s, 2x104

View Answer  
4
Correct Answer :

105rad/s, 2x104


Explanation :
No Explanation available for this question

a 555 TIMER OPERATES IN

1.  One-shot mode

2.  Free running mode

3.  Both (A) & (B)

4.  None of these

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4
Correct Answer :

Both (A) & (B)


Explanation :
No Explanation available for this question

A NE555 operates in a temperature range of

1.  00C-500C

2.  00C-700C

3.  00C-2000C

4.  None of these

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4
Correct Answer :

00C-700C


Explanation :
No Explanation available for this question

When not in use control pin of 555 timer

1.  Should be connected to the VCC

2.  Should be left open

3.  Should be connected to ground through a capacitor

4.  None of these

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4
Correct Answer :

Should be connected to ground through a capacitor


Explanation :
No Explanation available for this question

A 555 timer can be used to

1.  Stretch a pulse

2.  Integrate a signal

3.  Amplify a signal

4.  Both (A) & (B)

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4
Correct Answer :

Stretch a pulse


Explanation :
No Explanation available for this question

In a stable multi-vibrator using 555 timer RA=2.2K, RB=3.9K and C=0.1F. The free running frequency of the multi-vibrator is

1.  2KHz

2.  1.45KHz

3.  0

4.  Data insufficient

View Answer  
4
Correct Answer :

1.45KHz


Explanation :
No Explanation available for this question

The 555 timer as a stable multi vibrator can be used as

1.  A sinusoidal oscillator

2.  A square wave oscillator

3.  Both (A) & (B)

4.  None of these

View Answer  
4
Correct Answer :

A square wave oscillator


Explanation :
No Explanation available for this question
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