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- Question
The cut in voltages for germanium and silicon diodes respectively as
Options- A. 0.3 V and 0.7 V
- B. 0.7 V and 0.3 V
- C. 0.6 V and 0.9 V
- D. 0.5 V and 0.7 V
- Correct Answer
- 0.3 V and 0.7 V
- 1. A piece of iron is placed in a magnetic field
Options- A. the magnetic field will not be affected
- B. the magnetic lines of force will bend to pass through the piece
- C. the magnetic lines of force will bend away from the piece
- D. any of the above depending on type of iron Discuss
- 2. Most popular IF for receivers tuning to 540 to 1650 kHz is
Options- A. 433 kHz
- B. 455 kHz
- C. 545 kHz
- D. 555 kHz Discuss
- 3. In metals, the average drift velocity of electron per unit field is called mobility.
Options- A. True
- B. False Discuss
- 4. Two thyristor of same rating and same specifications
Options- A. will have equal turn on and turn off periods
- B. will have equal turn on but unequal turn off periods
- C. may have equal or unequal turn on and turn off periods
- D. will have unequal turn on and turn off periods Discuss
- 5. Semiconductors have a positive temperature coefficient of resistivity.
Options- A. True
- B. False Discuss
- 6. The number of valence electrons in silicon atom is
Options- A. 4
- B. 2
- C. 1
- D. zero Discuss
- 7. In a multiphase chopper, the different choppers operate in
Options- A. series and all simultaneously
- B. parallel and one at a time
- C. parallel and simultaneously
- D. either (b) or (c) Discuss
- 8. Which of the following oscillators is suitable for frequencies in the range of mega hertz?
Options- A. RC phase shift
- B. Wien bridge
- C. Hartley
- D. Both (a) and (c) Discuss
- 9. Which of these devices have four layers?
Options- A. UJT
- B. SCR
- C. TRIAC
- D. SCR and TRIAC Discuss
- 10. In Java it is possible to have
- An array of integers
- An array of string objects
- An array of arrays
- An array on integer and strings
Options- A. All
- B. 1, 2 and 3 only
- C. 1 and 2 only
- D. 1, 3 and 4 only Discuss
More questions
Correct Answer: the magnetic lines of force will bend to pass through the piece
Correct Answer: 455 kHz
Correct Answer: True
Correct Answer: may have equal or unequal turn on and turn off periods
Explanation:
Turn on and turn off times of similar SCRs may not be same.
Correct Answer: False
Explanation:
In semiconductors the temperature coefficient of resistivity is negative.
Correct Answer: 4
Correct Answer: parallel and one at a time
Explanation:
Only one chopper operates at one time.
Correct Answer: Hartley
Explanation:
Only LC oscillators are suitable for MHz range.
Correct Answer: SCR
Correct Answer: 1, 2 and 3 only
Explanation:
An array on integers and strings is not possible.
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