Discussion
Home ‣ Electronics and Communication Engineering ‣ Radio Receivers See What Others Are Saying!
- Question
The household radio receiver uses
Options- A. synchronous
- B. envelope detector
- C. radio detector
- D. none of the above
- Correct Answer
- envelope detector
- 1. A single phase series converter is used for
Options- A. high voltage output
- B. high current output
- C. high voltage and high current output
- D. improving the circuit efficiency Discuss
- 2. Consider the following statements
- The amplitude of an FM wave is constant
- FM is more immune to noise than AM
- FM broadcasts operate in upper VHF and UHF frequency ranges
- FM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments
Options- A. 1, 2, 3, 4
- B. 1, 2, 3
- C. 2, 3, 4
- D. 1, 3, 4 Discuss
- 3. A particle of charge Q coulombs is bound elastically to an equilibrium position with a force constant of f newton per metre. The polarizability of the system is
Options- A.
- B.
- C.
- D. Qf Discuss
- 4. In a CE amplifier the input impedance is equal to the ratio of
Options- A. ac base voltage to ac base current
- B. ac base voltage to ac emitter current
- C. ac emitter voltage to ac collector current
- D. ac collector voltage to ac collector current Discuss
- 5. A 3 phase series inverter has
Options- A. 12 thyristors
- B. 6 thyristors
- C. 3 thyristors
- D. 3 or 6 thyristors Discuss
- 6. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the speed is 1440 rpm. At 25 Hz, the speed is likely to be
Options- A. about 1350 rpm
- B. about 720 rpm
- C. about 360 rpm
- D. either (b) or (c) Discuss
- 7. To protect an SCR against high di/dt we connect
Options- A. a capacitance in series with SCR
- B. a capacitance in parallel with SCR
- C. an inductance in parallel with SCR
- D. an inductance in series with SCR Discuss
- 8. In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is
Options- A.
- B.
- C.
- D.
Discuss
- 9. Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor
Reason (R): Transistors are manufactured in very high voltage and current ratings.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R correct but R is not correct explanation of A
- C. A is correct but R is wrong
- D. A is wrong but R is correct Discuss
- 10. Assertion (A): Gate triggering is the most commonly used method for triggering of an SCR.
Reason (R): Even a small gate current is sufficient to turn on an SCR.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R correct but R is not correct explanation of A
- C. A is correct but R is wrong
- D. A is wrong but R is correct Discuss
More questions
Correct Answer: high voltage output
Explanation:
Series connection increases the voltage.
Correct Answer: 1, 2, 3
Explanation:
FM equipments are complex as compared to AM equipments.
Correct Answer:
Correct Answer: ac base voltage to ac base current
Explanation:
Input is applied to base with emitter grounded. The input impedance is the ratio of ac base voltage to ac base current.
Correct Answer: 6 thyristors
Correct Answer: about 720 rpm
Explanation:
In this case synchronous speed at 50 Hz is 1500 rpm. Therefore synchronous speed at 25 Hz is 750 rpm. Since slip is about 3 - 5%, speed is about 720 rpm.
Correct Answer: an inductance in series with SCR
Explanation:
current through inductance cannot change instantaneously.
Correct Answer:
Correct Answer: A is correct but R is wrong
Correct Answer: Both A and R are correct and R is correct explanation of A
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