Antenna and Microwave Engineering MCQ Questions and answers

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Q. Expression for noise of a two port network considering the noise due to transmission line and other lossy components is:

(A) gktb + gnadded
(B) gktb
(C) gnadded
(D) none of the mentioned

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Q. Noise equivalent temperature of a 2 stage cascade network is given by:

(A) te1 + te2/ g1
(B) te1 + te1
(C) te1 / te1
(D) none of the mentioned

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Q. For a Wilkinson power divider of insertion loss L and the coupler is matched to the external circuitry, and then the gain of the coupler in terms of insertion loss is:

(A) 2l
(B) 1/2l
(C) l
(D) 1/l

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Q. Noise equivalent temperature of Wilkinson coupler having a gain of 1/2L is given as:

(A) t (2l-1)
(B) t (2l+1)
(C) t (2l*1)
(D) t / (2l-1)

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Admin • 802.91K Points
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Q. Expression for over all noise figure of a mismatched amplifier is:

(A) 1+ (f-1)/ (1 -│Г│2)
(B) 1
(C) 1+ (f-1)
(D) (f-1)/ (1 -│Г│2)

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Q. One condition to be satisfied in an oscillator circuit so that stable oscillations are produced is:

(A) positive feedback is to be achieved
(B) negative feedback is to be achieved
(C) 1800 phase shift is required between the transistor input and output.
(D) none of the mentioned

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Q. In an oscillator, the resonant feedback circuit must have must have a low Q in order to achieve stable oscillation.

(A) true
(B) false
(C) ---
(D) ---

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Q. Quartz crystal and tourmaline used in oscillators work on the principle of:

(A) photo electric effect
(B) piezo electric effect
(C) raman effect
(D) black body radiation

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Q. A quartz crystals equivalent circuit is a series LCR circuit and has a series resonant frequency.

(A) true
(B) false
(C) ---
(D) ---

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Admin • 802.91K Points
Coach

Q. In the plot of reactance v/s frequency of a crystal oscillator, the reactance between series resonant frequency and parallel resonant frequency is:

(A) capacitive
(B) inductive
(C) both capacitive and inductive
(D) none of the mentioned

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Antenna and Microwave Engineering MCQs with answers Page - 16

Q. Expression for noise of a two port network considering the noise due to transmission line and other lossy components is:

Q. Noise equivalent temperature of a 2 stage cascade network is given by:

Q. For a Wilkinson power divider of insertion loss L and the coupler is matched to the external circuitry, and then the gain of the coupler in terms of insertion loss is:

Q. Noise equivalent temperature of Wilkinson coupler having a gain of 1/2L is given as:

Q. Expression for over all noise figure of a mismatched amplifier is:

Q. One condition to be satisfied in an oscillator circuit so that stable oscillations are produced is:

Q. In an oscillator, the resonant feedback circuit must have must have a low Q in order to achieve stable oscillation.

Q. Quartz crystal and tourmaline used in oscillators work on the principle of:

Q. A quartz crystals equivalent circuit is a series LCR circuit and has a series resonant frequency.

Q. In the plot of reactance v/s frequency of a crystal oscillator, the reactance between series resonant frequency and parallel resonant frequency is:

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