For the given Sinusoidal input voltage, the voltage waveform at point p of the clamper circuit shown in figure will be

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

A relaxation oscillator is made using op-amp as shown figure. The supply voltages of the op-amp are 12V. The voltage waveform at point P will be

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

In the given figure, if the input voltage is a sinusoidal signal, the output will appear as shown in

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The circuit of figure shows a 555 timer IC connected as an a stable multi vibrator. The value of the capacitor C is 10nF.The values of the resistors RA and RB for a frequency of 10KHz and a duty cycle of 0.75 for the output voltage waveform are

1.  RA=3.62k, RB=3.62k

2.  RA=3.62k, RB=7.25k

3.  RA=7.25k, RB=3.62k

4.  RA=7.25k, RB=7.25k

View Answer  
4
Correct Answer :

RA=7.25k, RB=3.62k


Explanation :
No Explanation available for this question

A RC coupled amplifier is assumed to have a single pole frequency transfer function. The maximum lower cut off frequency allowed for amplifier to pass 50Hz square wave with no more than 10% tilt is

1.  15.9Hz

2.  17Hz

3.  1.59Hz

4.  12Hz

View Answer  
4
Correct Answer :

1.59Hz


Explanation :
No Explanation available for this question

A power amplifier delivers 50W output at 50% efficiency. The ambient temperature is 250C. If the maximum allowable junction temperature is 1500C, then find the maximum thermal resistance Qjc that can be tolerated.

1.   50 K/W

2.  500C/W

3.  50C/mW

4.  None of these

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4
Correct Answer :

None of these


Explanation :
No Explanation available for this question

A half-wavelength antenna has radiation resistance equal to

1.  700Ω

2.  300Ω

3.  73Ω

4.  47Ω

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4
Correct Answer :

73Ω


Explanation :
No Explanation available for this question

Length of a helfware dipole antenna required to receive a 50 MHz radio signal is

1.   0.75 metre

2.  1.5 metres

3.   3 metre

4.   6 metres

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4
Correct Answer :

3 metre


Explanation :
No Explanation available for this question

A Marconi antenna is required to transmit a 100 MHz signal. If the velocity factor for the antenna is 0.9, its optimum length will be

1.   0.675 metre

2.  1.35 metres

3.  2.27 metre

4.   5.4 metres

View Answer  
4
Correct Answer :

0.675 metre


Explanation :
No Explanation available for this question

The folded diple antenna is quite conveniently connected to

1.   Coaxial line

2.  Two-wire line

3.  Flat ribbon-type transmission line

4.   All the above

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4
Correct Answer :

Flat ribbon-type transmission line


Explanation :
No Explanation available for this question
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