# 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.

4

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.

4

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.

4

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

4

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

4

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

4

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

4

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

4

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

4

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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