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- Question
Match the following:
List I (DOS commands) List II (Meaning) A. DBLSPACE 1. Deletes a director and its sub-directories B. MEM 2. Displays the amount of used and free memory C. SYS 3. Put a copy of DOS on disk D. DELTREE 4. Compresses files to increase the storage capacity of disc
Options- A. A-4, B-3, C-2, D-1
- B. A-2, B-3, C-4, D-1
- C. A-4, B-2, C-3, D-1
- D. A-1, B-2, C-3, D-4
- Correct Answer
- A-4, B-2, C-3, D-1
- 1. In 8 cavity magnetron the p mode corresponds to a total phase shift equal to
Options- A. ± 8 p radians around the periphery
- B. ± 4 p radians around the periphery
- C. ± 2 p radians around the periphery
- D. ± 16 p radians around the periphery Discuss
- 2. Match the following:
List I (DOS commands) List II (Meaning) A. DBLSPACE 1. Deletes a director and its sub-directories B. MEM 2. Displays the amount of used and free memory C. SYS 3. Put a copy of DOS on disk D. DELTREE 4. Compresses files to increase the storage capacity of disc
Options- A. A-4, B-3, C-2, D-1
- B. A-2, B-3, C-4, D-1
- C. A-4, B-2, C-3, D-1
- D. A-1, B-2, C-3, D-4 Discuss
- 3. In a 3 phase fully controlled converter the firing frequency is
Options- A. 3 times the line frequency
- B. 6 times the line frequency
- C. 9 times the line frequency
- D. 12 times the line frequency Discuss
- 4. Assertion (A): The output voltage of an inverter can be controlled by PWM technique
Reason (R): In a current source inverter the input current is constant.
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
- 5. Assertion (A): Doping level in extrinsic semiconductors is very small.
Reason (R): Additional of impurity in the ratio of 1 part in 108 parts increases the number of charge carriers by about 20.
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
- 6. Which part of radio spectrum is more crowded?
Options- A. Lower frequency part
- B. Higher frequency part
- C. Both (a) and (b)
- D. None of these Discuss
- 7. For satellite transmission, analog signals may be converted into digital form with the help of
Options- A. modem
- B. transponder
- C. codec
- D. compandor Discuss
- 8. Assertion (A): Bolometer is frequently used in microwave power measurement.
Reason (R): In a bolometer the input microwave power causes a change in resistance.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R are 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
- 9. Assertion (A): An ideal rectifier should have unity harmonic factor
Reason (R): An ideal rectifier should have unity displacement factor.
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): Power transistor has lower switching time than SCR
Reason (R): Power transistor has greater switching time than 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: ± 8 p radians around the periphery
Correct Answer: A-4, B-2, C-3, D-1
Correct Answer: 6 times the line frequency
Explanation:
It is a 6 pulse converter.
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: Both A and R are true and R is correct explanation of A
Correct Answer: None of these
Correct Answer: codec
Correct Answer: Both A and R are correct but R is not correct explanation of A
Correct Answer: A is wrong but R is correct
Explanation:
Ideal rectifier should have zero harmonic factor and unity displacement factor.
Correct Answer: A is wrong but R is correct
Explanation:
Power transistor does not have high 
rating.
rating.
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