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Q1. | Radiation efficiency of an antenna is defined as the ratio of |

A. | Total power radiated by an antenna to the net power accepted by the antenna from the connected transmitter [Correct Answer] |

B. | The frequency at which minimum power is radiated to the frequency at which maximum power is radiated [Wrong Answer] |

C. | Total power accepted from the transmitter to total power generated by the transmitter [Wrong Answer] |

D. | Power in main lobe to that in the side lobe [Wrong Answer] |

View Answer
Explanation:-
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**Also Read Similar Questions Below :**

⇒ The amplifier network is shown bel

6.42 kΩ, 5.6 kΩ

6.42 Ω, (5.62) kΩ

6.4kΩ, (5.62) kΩ

6.42 Ω, 5.6 kΩ

⇒ If (10)

_{x}x (10)

_{x}= (100)

_{x}; (100)

_{x}x (100)

_{x}= (10000)

_{x}then x can take value :

2

5

10

all of these

⇒ Nyquist plot provides information about absolute stability as well as relative stability.

TRUE

FALSE

⇒ End fire array has a dipole spacing of λ/2.

TRUE

FALSE

⇒

**Assertion (A):** The impedance of a matched load is equal to characteristic impedance of line.

**Reason (R):** A matched termination absorbs all the power incident on it.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ The number of free electrons in acceptor atom is

1

2

3

4

⇒ Which of the following uses 'transferred electron effect' for production of microwaves?

Silicon

Germanium

Metal-semiconductor junction

Gallium Arsenide

⇒ A pre-emphasis circuit

boosts base frequencies

pre amplifies the complete audio band

amplifies higher audio frequencies

converts FM into phase modulation

⇒ Strength of space wave is not dependent on distance.

TRUE

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⇒ A P-N junction diode dynamic conductance is directly proportional to

the applied voltage

the temperature

its current

thermal voltage

⇒ A speech signal, band limited to 4kHz and peak voltage varying between + 5V and - 5V is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits. The number of quantization levels required to reduce the quantization noise by a factor of 4 would be

1024

512

256

64

⇒ In the figure shown, assume that all the capacitors are initially unchanged and V

_{i}(

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*t*) volts then V

_{0}(

*t*) is give

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*e*

^{-0.004t}volts

8 (

*j*-

*e*

^{-0.004t}) volts

8

*u*(

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8 volts

⇒ A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is

100

99

1.01

0.99

⇒ In figure, S is closed at

*t*= 0. At

*t*=

*t*

_{1}, I = 1 A and

*di*/

*dt*= 1 A/s. Then the value of

1 H

2 H

3 H

4 H

⇒ For a Gaussian process, auto-correlation also implies

statistical dependence

statistical independence

ergodic process

none of the above

⇒ In digital TV digital imaging standard comprises

six profiles and four levels

four levels and six profiles

six profiles and six levels

four profiles and four levels

⇒ A capacitor with initial charge

*q*

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^{+}acts as

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⇒ The minimum decimal equivalent of the number 11C0 is

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269

⇒ In a bipolar transistor at room temperature if the emitter current is doubled the voltage across its base emitter junction

doubles

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increase by about 20 mV

decrease by about 20 mV

⇒ In a gate output is Low if and only if all inputs are High. The gate is

OR

AND

NOR

NAND

⇒ The given figure shows dB magnitude plots for type 0, type 1 and type 2 systems. Out of t

curves 1, 2, 3 are for type 0, 1, 2 systems respectively

curves 1, 2, 3 are for type 2, 1, 0 systems respectively

curves 1, 2, 3 are for type 1, 0, 2 systems respectively

curves 1, 2, 3 are for type 1, 2, 0 systems respectively

⇒ The use of SSB

halves the bandwidth required for transmission

does not affect the bandwidth for transmission

decreases the bandwidth required for transmission by 25%

decreases the bandwidth required for transmission by 66.6%

⇒ A super heterodyne receiver has a IF of 465 kHz. It is tuned to a station broadcasting at 500 KHz and its oscillator is operating at 965 KHz, then the 1330 KHz frequency would be

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image frequency

gyro frequency

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⇒ The zener diode in the rectangular circuit shown in the figure has a zener voltage of 5.8 volts and a zener knee current of 0.5 mA. The maximum load current drawn from this circuit ensuring proper functioning over the input voltage range between 20 and 30 volts

23.7 mA

14.2 mA

13.7 mA

24.2 mA

⇒ For a = - 1, find the value of V

_{2∞0V1none of the above}

⇒ In the given circuit, the switch is open for a long time. At time

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80 V and 0 V

80 V and 80 V

⇒ In a minimum function

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the degree of numerator is lower than that of denominator

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⇒ Which of the following can be used for measuring capacitance?

De sauty bridge

Maxwell's bridge

Anderson bridge

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⇒ The number of valence electrons in donor impurity are

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4

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⇒ The phase angle curve of G(

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*j*ω) can be drawn

by adding the phase angle curves of individual factors

by subtracting the phase angle curves of individual factors

by multiplying the phase angle curves of individual factors

by dividing the phase angle curves of individual factors