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Electronics and Communication Engineering - Radio Receivers

Exercise : Radio Receivers - Section 1
36.
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
114 kW
336 kW
384 kW
455 kW
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The output of a diode detector contains
D.C. voltage
modulating signal
RF ripple
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Which of the following noise does not occur in transistors?
Partition noise
Shot noise
Flicker noise
Resistance noise
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Noise generated in a resistor is also known as
partition noise
white noise
thermal noise
shot noise
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?
Variable tuning inductor
Ganged tuning inductor
Variable capacitor
Variable preset
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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