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- Question
The output wave of a cycloconverter consists of a number of segments derived from the input wave.
Options- A. True
- B. False
- Correct Answer
- True
- 1. Dielectric constant, under the condition of alternating fields, is a complex quantity.
Options- A. True
- B. False Discuss
- 2. A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is
Options- A. 15 V
- B. 152 V
- C. 30 V
- D. 302 V Discuss
- 3. Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?
Options- A. Pressure of solar radiations
- B. Gravitational changes due to Sun and Moon
- C. Oblateness of the Earth
- D. Weight of the satellite Discuss
- 4. Assertion (A): Holes are majority carriers in p type semiconductor.
Reason (R): In p type semiconductor, the electrons produced by thermal agitation recombine with holes.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
- 5. Match the following:
List I List II A. CLP 1. Displays DOS version being used B. MSAV 2. Partitions hard disk C. F DISK 3. Anti-virus program D. VER 4. Cleans screen
Options- A. A-1, B-2, C-3, D-4
- B. A-4, B-3, C-2, D-1
- C. A-2, B-3, C-4, D-1
- D. A-2, B-1, C-4, D-3 Discuss
- 6. The gate lead, in a thyristor is welded to :
Options- A. p layer to which anode is connected
- B. n layer nearest to the anode terminal
- C. p layer nearest to the cathode terminal
- D. outside n layer Discuss
- 7. In an intrinsic semiconductor, at a given temperature T
Options- A. the number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
- B. the number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
- C. the number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
- D. any of the above Discuss
- 8. The semiconductor diode which can be used in switching circuit in microwave range is
Options- A. PIN diode
- B. Varactor diode
- C. Tunnel diode
- D. Gunn diode Discuss
- 9. The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of
Options- A. 17.34/4.5
- B. 17.34 x 4.5
- C. (17.34/4.5)2
- D. (17.34/4.5)4 Discuss
- 10. In a single phase dual converter, a1, and a2 are firing angles of the two converters. Then
Options- A. a1 - a2 =
- B. a1 + a2 = p
- C. a1 - a2 = p
- D. a1 + a2 =
Discuss
More questions
Correct Answer: True
Correct Answer: 30 V
Correct Answer: Weight of the satellite
Correct Answer: Both A and R are true and R is correct explanation of A
Correct Answer: A-4, B-3, C-2, D-1
Correct Answer: n layer nearest to the anode terminal
Correct Answer: the number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
Correct Answer: PIN diode
Explanation:
A PIN diode has an intrinsic (i) layer between p and n layers. When reverse bias is applied depletion layers are formed at p-i and i-n junctions.
The effective/width of depletion layer increases by the width of i layer. It can be used as a voltage controlled attenuator.
At high frequencies the rectification effect ceases and impedance of diode is effectively that of i layer.
This impedance varies with the applied bias. It is used in high frequency switching circuits, limiters, modulators etc.
Correct Answer: (17.34/4.5)2
Correct Answer: a1 + a2 = p
Explanation:
Since one converter is rectifying and the other is inverting
Vdc1 = -Vdc2
or a1 + a2 = p.
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