# 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

4

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

4

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

4

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

4

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

4

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

4

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

4

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)

4

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

4

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

4