Discussion
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- Question
In carbon resistor colour code, if the third band is of silver, it indicates
Options- A. that three zeros are to be added to indicate the resistance value
- B. multiplier is 0.01
- C. multiplier is 0.1
- D. tolerance is ± 5%
- Correct Answer
- multiplier is 0.01
- 1. A negative feedback system has
. The closed loop system is stable for
Options- A. K > 20
- B. 15 < K < 19
- C. 8 ? K ? 14
- D. K < 6 Discuss
- 2. The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch.
Options- A. 12
- B. 20
- C. 5
- D. 36 Discuss
- 3. In a superheterodyne receiver
Options- A. the IF stage has better selectivity than RF stage
- B. the RF stage has better selectivity than IF stage
- C. the RF stage has same selectivity than IF stage
- D. none of the above Discuss
- 4. Space wave may be a direct wave or wave reflected from earth.
Options- A. True
- B. False Discuss
- 5. A duplexer is a device used to
Options- A. feed more than one receiver from a single antenna
- B. connect two transmitters to the same antenna
- C. connect a receiver and a transmitter to the same antenna
- D. none of these Discuss
- 6. In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle
Options- A. is zero
- B. is 60°
- C. is more than 60°
- D. is more than 90° Discuss
- 7. Superheterodyne receiver can be used in
Options- A. AM
- B. FM
- C. SSB
- D. All of the above Discuss
- 8. The resistance of a metallic wire would
Options- A. increase as f increase
- B. decrease as f increase
- C. remains the same at all frequencies
- D. increase with f up to a certain frequency and then decrease Discuss
- 9. In 180° mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.
Options- A. True
- B. False Discuss
- 10. An SCR has a turn on time of 4 ?s. The gate pulse should have a duration of about
Options- A. 2 ?s
- B. 5 ?s
- C. 20 ?s
- D. 50 ?s Discuss
More questions
Correct Answer: K < 6
Explanation:
Find characteristic equation.
Correct Answer: 5
Correct Answer: the IF stage has better selectivity than RF stage
Correct Answer: False
Explanation:
Strength of space wave depends on distance as it suffers attenuation.
Correct Answer: connect a receiver and a transmitter to the same antenna
Correct Answer: is more than 60°
Correct Answer: All of the above
Correct Answer: increase as f increase
Explanation:
As increases the resistance increases due to skin effect.
Correct Answer: False
Explanation:
In 180° mode three thyristors conduct simultaneously.
Correct Answer: 5 ?s
Explanation:
Duration of gate pulse should be slightly more than turn time of SCR.
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