The gain of antenna (G) is the ratio of power radiated in a particular direction to the power radiated from an isotropic antenna.

In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

A

Transmission efficiency

B

Front to back ratio

C

Loss coefficient

D

None of the above

For an isotropic antenna, the average power Pav can be expressed in terms of radiated power Pr as ____

A

Pav=Pr/4π

B

Pav=Pr/2πr2

C

Pav=Pr/2π

D

Pav=Pr/4πr2

Consider a lossless antenna with a directive gain of +6 decibel. If 1 milliwatt of power is fed to it, the total power radiated by the antenna will be (in milliwatt)

A

4

B

1

C

7

D

1/4

The power density radiated by an isotropic antenna is given by the relation:

A

Pt/4πR2

B

Pt/4R2

C

Pt/R2

D

None of the mentioned

The ratio of maximum power density in the desired direction to the average power radiated from the antenna is called as _______

A

directivity

B

directive gain

C

power gain

D

partial directivity

If the power input to an antenna is 100 mW and if the radiated power is measured to be 90 mW, then the efficiency of the antenna is:

A

75 %

B

80 %

C

90 %

D

Insufficient data

Consider the Assertion (A) and Reason (R) and select the correct answer:
Assertion (A) If one premise is particular, the conclusion must be particular.
Reason (R) (i) An affirmative particular has no distributed terms, and a negative particular has an only one.
(ii) The premises cannot both be particular and thus must differ in quantity.

A

A and R both are true but R (i) and (ii) correct explanations of A

B

A and R both are true but R (i) is correct explanation of A

C

A and R both are true but R (ii) is a correct explanation of A

D

A is true, but R (i) and (ii) are incorrect explanations of A

Effective radiated power of an isotropic radiator can be given as a product of

A

Radiated power and received power

B

Effective area and physical area

C

Transmitted power and transmitting gain

D

Receiving power and receiving gain

Effective isotropic radiated power is given by ____

A

product of input power to the antenna and gain of the antenna

B

sum of input power to the antenna and gain of the antenna

C

difference of input power to the antenna and gain of the antenna

D

ratio of product of input power to the antenna and gain of the antenna

In isotropic filtering, which of the following is/are the simplest isotropic derivative operator?

A

Laplacian

B

Gradient

C

All of the mentioned

D

None of the mentioned

The gain of antenna (G) is the ratio of power radiated in a particular direction to the power radiated from an isotropic antenna.

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