Discussion
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- Question
A 3 port circulator is in the given figure. Its scattering matrix is
Options- A.
- B.
- C.
- D.
- Correct Answer
-
- 1. In which of these is reverse recovery time nearly zero?
Options- A. Zener diode
- B. Tunnel diode
- C. Schottky diode
- D. PIN diode Discuss
- 2. The number of leads in a DIAC are
Options- A. 2
- B. 3
- C. 4
- D. 6 Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. The field pattern of a solenoid is similar to that of bar magnet.
Options- A. True
- B. False Discuss
- 7. 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
- 8. An electron shell corresponding to principal quantum number n can contain a maximum of
Options- A. n2 electrons
- B. 2n2 electrons
- C. 2n electron
- D. n3 electron Discuss
- 9. The diagram to show distance time history of electrons in klystron amplifier is called
Options- A. apple gate diagram
- B. asynchronous diagram
- C. bunching diagram
- D. velocity modulation diagram Discuss
- 10. Spontaneous magnetisation is characteristic of ferromagnetic materials.
Options- A. True
- B. False Discuss
More questions
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
Correct Answer: 2n2 electrons
Explanation:
The electron shell corresponding to the principal quantum number can contain no more than 2n2 electrons.
Correct Answer: apple gate diagram
Explanation:
Applegate diagram is distance time plot.
Correct Answer: True
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