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Q1. | In the given figure forward current wave has a magnitud |

A. | 0.45 A [Wrong Answer] |

B. | 0.3 A [Correct Answer] |

C. | 0.2 A [Wrong Answer] |

D. | 0.1 A [Wrong Answer] |

View Answer
Explanation:-
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⇒ Consider the following statements about advantages of phase discriminator over slope detector

- Fewer tuned circuits
- Greater limiting
- Better linearity
- Easy alignment

1, 2, 3, 4

2, 3, 4

1, 2, 3

1, 3, 4

⇒ Antenna used for direction finding is

long dipole

parabolic

rhombic

helical

⇒ The efficiency of a chopper circuit is about

80% or more

around 50%

around 20%

around 5%

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | IF noise | 1. | Ganged tuning |

B. | Image frequency | 2. | Spurious response |

C. | Station selector | 3. | Leaky filter capacitor |

D. | Excessive Hum | 4. | Mixer stage |

A-3, B-2, C-1, D-4

A-2, B-3, C-1, D-4

A-1, B-2, C-3, D-4

A-4, B-2, C-1, D-3

⇒ PID controlled system has

P and I actions in forward path and D action in feedback path

P and I actions in feedback path and actions in forward path

All the three (

*i.e.,*P, I and D) actions in forward path

All the three (

*i.e.,*P, I and D) actions in feedback path

⇒ In a programmable counter

the starting number for counting can be programmed

the modulus can be programmed

both the starting number and modulus can be programmed

either the starting number or modulus can be programmed

⇒ In the given figure, the input frequency is such that R = X

_{C}.

*v*

_{0}lags

*v*

_{i}by 45°

*v*

_{0}lags

*v*

_{i}by 90°

*v*

_{0}leads

*v*

_{i}by 45°

*v*

_{0}leads

*v*

_{i}by 90°

⇒ Consider the following stateme

1, 2 and 3

1 and 2 only

2 and 3 only

3 and 4 only

⇒ If the repeller voltage in a klystron oscillator is increased the transit time of electron

will be increased

will be decreased

will remain the same

either (a) or (b)

⇒ If VSWR is infinite, the transmission line is terminated in

short circuit

complex impedance

open circuit

either (a) or (c)

⇒ For an

*m*x

*n*matrix A, the eigen values are the roots of the characteristic equation

|I - A|

|λI - A| = 0

|λA - I| = 0

|A - I| = 0

⇒ A uniform wave have components

in the perpendicular direction E existing while H is zero

in the direction of propagation E existing while H is zero

E and H are zero in direction perpendicular to direction of propagation

E and H existing only in direction perpendicular to direction of propagation

⇒ Four memory chips of 16 x 4 size have their address buses connected together. This system will be of size

64 x 4

16 x 16

32 x 8

256 x 1

⇒ An op-amp uses

RC coupling

direct coupling

transformer coupling

either (b) or (c)

⇒ Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectified output will be

0

N/2

N/2

N

⇒ Which of the following is decimal equivalent of the binary 1111111?

27

87

127

167

⇒ One of the function of the Sio

_{2}layer in an IC is to

act as a dielectric for capacitors

prevent shorting of elements by interconnections

from cathodes for diodes

afford protection from the radiations

⇒ In a CE amplifier circuit the emitter by pass capacitor is remove. The ac output voltage

increases

remains the same

increases or decreases

decreases

⇒ A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then the voltage across each resistor is

half

doubled

increase by 4 times

no change

⇒ In the circuit, S was initially open. At time

*t*= 0, S is closed. When the current through the inductor is 6 A, the rate of change of current through the resistor is 6 A/s. The value of the inductor woul

1 H

2 H

3 H

4 H

⇒ The signal define by the equations

*u*(

*t*-

*a*) = 0 for

*t*<

*a*and

*u*(

*t*-

*a*) = 1 for

*t*≥

*a*is

a unit step function

a shifted unit step function orginating at

*t*=

*a*

a pulse function

none of the above

⇒ What is the decimal equivalent of the binary number shown in fourth row?

79

97

117

127

⇒ Final value theorem is used to find

steady state value of system output

initial value of output

transient beaviour of output

none of these

⇒ If

*f*(

*t*) is in volts, then F(

*j*ω) is in

volts

volt seconds

volts/sec

volt-sec

^{2}

⇒ Consider the following statements relating to synchros

- Rotor of control transformer is either disc shaped or umbrella shaped
- Rotor of transmitter has low magnetic reluctance
- Transmitter and control transformer pair act as error detector

1, 2, 3

1 and 2

2 and 3

1 and 3

⇒ In the given figure shows a logic circuit. The minimum Boolean expression for this circui

A + B

A + B + C

AB + C

AB + AC + BC

⇒ The sum of two sine waves of different frequencies is a sine wave.

TRUE

FALSE

⇒ Radiation efficiency of an antenna is defined as the ratio of

Total power radiated by an antenna to the net power accepted by the antenna from the connected transmitter

The frequency at which minimum power is radiated to the frequency at which maximum power is radiated

Total power accepted from the transmitter to total power generated by the transmitter

Power in main lobe to that in the side lobe

⇒ A compiler converts a high level computer program into machine language program.

TRUE

FALSE

⇒ Semiconductor ROM's are sometimes preferred to semiconductor RAM's because

ROM's are cheaper than RAMs

ROMs are faster

ROMs do not require power supply for their operations

Programs stored in ROMs cannot be altered either by the power failure or by the user