Antenna and Microwave Engineering MCQ Questions and answers

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Q. In the equivalent circuit of a quartz crystal, LCR arm has an inductance of 4 mH and capacitor has a value of 4nF, then the series resonant frequency of the oscillator is:

(A) 0.25 mhz
(B) 2.5 mhz
(C) 25 mhz
(D) 5 mhz

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Q. Parallel resonant frequency of quartz crystal is given by:

(A) 1/ √(lcₒc/(cₒ+c))
(B) 1/√lc
(C) 1/√lcₒ
(D) 1/ √(l(cₒ+c) )

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Q. The equivalent circuit of a quartz crystal has LCR arm capacitance of 12nF and inductance of 3mH and parallel arm capacitance of 4nF. Parallel resonant frequency for the circuit is:

(A) 3 mhz
(B) 0.3 mhz
(C) 6 mhz
(D) 9 mhz

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Q. In microwave oscillators, negative resistance transistors and diodes are used in order to generate oscillations in the circuit.

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

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Q. Any device with negative impedance as its characteristic property can be called:

(A) energy source
(B) energy sink
(C) oscillator
(D) none of the mentioned

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Q. In a microwave oscillator, a load of 50+50j is connected across a negative resistance device of impedance -50-50j. Steady state oscillation is not achieved in the oscillator.

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

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Q. For achieving steady state oscillation, the condition to be satisfied in terms of reflection coefficients is:

(A) Гin=Гl
(B) Гin=-Гl
(C) Гin=1/Гl
(D) none of the mentioned

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Q. To achieve stable oscillation, Zin + ZL=0 is the only necessary and sufficient condition to be satisfied by the microwave oscillator.

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

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Q. In transistor oscillators, the requirement of a negative resistance device is satisfied using a varactor diode.

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

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Q. In transistor oscillators, FET and BJT are used. Instability is achieved by:

(A) giving a negative feedback
(B) giving a positive feedback
(C) using a tank circuit
(D) none of the mentioned

Antenna and Microwave Engineering MCQs with answers Page - 17

Q. In the equivalent circuit of a quartz crystal, LCR arm has an inductance of 4 mH and capacitor has a value of 4nF, then the series resonant frequency of the oscillator is:

Q. Parallel resonant frequency of quartz crystal is given by:

Q. The equivalent circuit of a quartz crystal has LCR arm capacitance of 12nF and inductance of 3mH and parallel arm capacitance of 4nF. Parallel resonant frequency for the circuit is:

Q. In microwave oscillators, negative resistance transistors and diodes are used in order to generate oscillations in the circuit.

Q. Any device with negative impedance as its characteristic property can be called:

Q. In a microwave oscillator, a load of 50+50j is connected across a negative resistance device of impedance -50-50j. Steady state oscillation is not achieved in the oscillator.

Q. For achieving steady state oscillation, the condition to be satisfied in terms of reflection coefficients is:

Q. To achieve stable oscillation, Zin + ZL=0 is the only necessary and sufficient condition to be satisfied by the microwave oscillator.

Q. In transistor oscillators, the requirement of a negative resistance device is satisfied using a varactor diode.

Q. In transistor oscillators, FET and BJT are used. Instability is achieved by:

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