Antenna and Microwave Engineering MCQ Questions and answers

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Q. The necessary condition for oscillation in a Colpitts oscillator is:

(A) c2/c1=gm/gi
(B) c1/c2=gm/gi
(C) c2/c1= gm*gi
(D) none of the mentioned

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Q. Colpitts oscillator operating at 50 MHz has an inductor in the feedback section of value 0.10µH. then the values of the capacitors in the feedback section is:

(A) 100 pf, 100 pf
(B) 100 pf, 50 pf
(C) 70 pf, 130 pf
(D) 80 pf, 60 pf

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Q. An inductor is operating at frequency of 50 MHz. Its inductance is 0.1 µH, and then the series resistance associated with the inductor is: (Qo=100)

(A) 0.31 Ω
(B) 1.32 Ω
(C) 1 Ω
(D) 1.561 Ω

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Q. Hartley oscillator has inductance values of 12 mH and 4 mH in the feedback section and a capacitor of 4 nF. Then the resonant frequency of the circuit is:

(A) 19.89 khz
(B) 25 khz
(C) 45 khz
(D) 12 khz

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Q. Colpitts oscillator in the feedback section has an inductance of 4 mH and capacitors of 12 nH and 4 nH. Then the resonant frequency of Colpitts oscillator is:

(A) 50.4 khz
(B) 35.1 khz
(C) 45.9 khz
(D) none of the mentioned

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Q. For Colpitts oscillator, the capacitors C1 and C2 in the feedback network are 1 µF and 25 µF respectively. Then the β value of the transistor is:

(A) 35
(B) 000.76
(C) 25
(D) 0.0025

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Q. Amplifier efficiency is the ratio of RF output power to DC input power. This parameter determines the performance of an amplifier.

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

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Q. is defined as the ratio of desired signal power to undesired noise power.

(A) signal to noise ratio
(B) noise to signal ratio
(C) noise figure
(D) noise temperature

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Q. is defined as the ratio of input signal to noise ratio to the output signal to noise ratio.

(A) noise figure
(B) noise temperature
(C) snro
(D) none of the mentioned

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Q. The equivalent noise temperature of a network given the noise figure of the network or system is:

(A) t0(f-1)
(B) t0(f+1)
(C) t0(f)
(D) t0/f

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Antenna and Microwave Engineering MCQs with answers Page - 15

Q. The necessary condition for oscillation in a Colpitts oscillator is:

Q. Colpitts oscillator operating at 50 MHz has an inductor in the feedback section of value 0.10µH. then the values of the capacitors in the feedback section is:

Q. An inductor is operating at frequency of 50 MHz. Its inductance is 0.1 µH, and then the series resistance associated with the inductor is: (Qo=100)

Q. Hartley oscillator has inductance values of 12 mH and 4 mH in the feedback section and a capacitor of 4 nF. Then the resonant frequency of the circuit is:

Q. Colpitts oscillator in the feedback section has an inductance of 4 mH and capacitors of 12 nH and 4 nH. Then the resonant frequency of Colpitts oscillator is:

Q. For Colpitts oscillator, the capacitors C1 and C2 in the feedback network are 1 µF and 25 µF respectively. Then the β value of the transistor is:

Q. Amplifier efficiency is the ratio of RF output power to DC input power. This parameter determines the performance of an amplifier.

Q. is defined as the ratio of desired signal power to undesired noise power.

Q. is defined as the ratio of input signal to noise ratio to the output signal to noise ratio.

Q. The equivalent noise temperature of a network given the noise figure of the network or system is:

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