Explore topic-wise MCQs in Radio Receivers.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Radio Receivers knowledge and support exam preparation. Choose a topic below to get started.

1.

An arbitrary signal m (t) has zero average value and it is bandlimited to 3.2 kHz. It is sampled at the rate of 8 K samples/S. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. The output of band pass filter is

A. AM-DSB signal with suppressed carrier
B. AM-DSB signal with carrier
C. AM-SSB signal with carrier
D. a sequence of exponentially decaying sine waves
Answer» C. AM-SSB signal with carrier
Discussion
2.

An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is

A. 114 kW
B. 336 kW
C. 384 kW
D. 455 kW
Answer» C. 384 kW
Discussion
3.

Which of the following statement about the amplitude limiter is not valid?

A. Leak type bias must be used
B. Output must be tuned
C. The circuit is always biased in class
D. , by virtue of the leak type bias
E. When the input increases past the threshold of limiting, the gain decreases to keep the output constant
Answer» D. , by virtue of the leak type bias
Discussion
4.

An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is

A. 34%
B. 55.5%
C. 68.8%
D. 84.7%
Answer» E.
Discussion
5.

Statement 1 Diode is the most common device used for demodulation. Statement 2 A discriminator is a FM detector.

A. Statement 1 is true but statement 2 is false
B. Statement 1 is false but statement 2 is true
C. Both the statements are true
D. Both the statements are false
Answer» D. Both the statements are false
Discussion