Discussion
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- Question
When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is
Options- A. 555 kHz
- B. 1010 kHz
- C. 1465 kHz
- D. 1920 kHz
- Correct Answer
- 1465 kHz
- 1. In a conductor which of the following relations hold good?
Options- A. ? x D = r
- B. ? . D = r
- C. ? x D = 0
- D. ? . D = 0 Discuss
- 2. In a multiphase chopper, all choppers operate together.
Options- A. True
- B. False Discuss
- 3. In a receiver, at higher frequencies
Options- A. tracking will be improved
- B. tracking will be poor
- C. selectivity will be poor
- D. image frequency rejection will be poor Discuss
- 4. In which of these is reverse recovery time nearly zero?
Options- A. Zener diode
- B. Tunnel diode
- C. Schottky diode
- D. PIN diode Discuss
- 5. The number of leads in a DIAC are
Options- A. 2
- B. 3
- C. 4
- D. 6 Discuss
- 6. A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is
Options- A. 20 mH
- B. about 31 mH
- C. about 51 mH
- D. about 92 mH Discuss
- 7. The capacitance of a capacitor is not affected by
Options- A. area of plates
- B. thickness of plates
- C. ?r
- D. distance between plates Discuss
- 8. In a semi converter feeding a resistive load
Options- A. the waveshapes of output voltage and output current are exactly similar
- B. the waveshapes of output voltage and output current can not be similar
- C. the waveshapes of output voltage and output current are similar only for low values of firing angle
- D. the waveshapes of output voltage and output current may be similar or dissimilar Discuss
- 9. The field pattern of a solenoid is similar to that of bar magnet.
Options- A. True
- B. False Discuss
- 10. Match the following:
List I (Logic family) List II (Characteristic of logic family) A. TTL 1. Maximum power Consumption B. ECL 2. Highest Packing Density C. NMOS 3. Least Power Consumption D. CMOS 4. Saturated Logic
Options- A. A-1, B-4, C-2, D-3
- B. A-1, B-4, C-3, D-2
- C. A-4, B-1, C-2, D-3
- D. A-4, B-1, C-3, D-2 Discuss
More questions
Correct Answer: ? x D = 0
Explanation:
Inside a conductor free charge is zero, hence, ? x D = 0.
Correct Answer: False
Explanation:
They operate in a sequence.
Correct Answer: tracking will be improved
Correct Answer: Schottky diode
Explanation:
In schottky diode there is no charge storage and hence almost zero reverse recovery time.
Correct Answer: 2
Correct Answer: about 31 mH
Explanation:
.
Correct Answer: thickness of plates
Explanation:
Capacitance depends on area, distance and ?r but not on thickness of plates.
Correct Answer: the waveshapes of output voltage and output current are exactly similar
Correct Answer: True
Correct Answer: A-4, B-1, C-2, D-3
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