Discussion
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- Question
Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?
Options- A. Variable selectivity
- B. Variable sensitivity
- C. Double conversion
- D. Squelch
- Correct Answer
- Variable sensitivity
- 1. Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.
Options- A. True
- B. False Discuss
- 2. BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are
Options- A. a, b, d
- B. a, b, c
- C. all
- D. a, b, g, c, d Discuss
- 3. Which statement is correct?
Options- A. BJT and MOSFET are current controlled devices
- B. BJT is voltage controlled and MOSFET is current controlled device
- C. BJT and MOSFET are voltage controlled devices
- D. BJT is current controlled and MOSFET is voltage controlled device Discuss
- 4. Assertion (A): For a magnetic material M = (?r - 1) H, where M is magnetic dipole moment/m3, H is field intensity A/m and ?r is relative permeability.
Reason (R): ?r can have any value from 0 to hundreds of thousands.
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. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is
Options- A. Armstrong oscillator
- B. Colpitts oscillator
- C. Clapp oscillator
- D. Ultra Audio oscillator Discuss
- 6. Assertion (A): Microprocessor 8085 has on-chip oscillator with inbuilt crystal.
Reason (R): For frequency stability crystal oscillator is preferred.
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 R is wrong
- D. A is wrong R is correct Discuss
- 7. In the given figure reflection coefficient at load is
Options- A. 0.6
- B. - 0.6
- C. 0.4
- D. - 0.4 Discuss
- 8. In Laplace transform, multiplication by e-at in time domain becomes
Options- A. translation by a in s domain
- B. translation by (-a) in s domain
- C. multiplication by e-as in s domain
- D. none of the above Discuss
- 9. Spontaneous polarization occurs in ferroelectric materials.
Options- A. True
- B. False Discuss
- 10. In load commutated chopper, the commutating element
Options- A. is capacitor
- B. is capacitor and inductor
- C. is capacitor, inductor and auxiliary thyristor
- D. any of the above depending on load Discuss
More questions
Correct Answer: False
Explanation:
Work function is the minimum energy required by the fastest electron at 0 K to escape from the metal surface.
Correct Answer: all
Explanation:
1000 equals decimal 8 Therefore all segments will lit up.
Correct Answer: BJT is current controlled and MOSFET is voltage controlled device
Correct Answer: A is true but R is false
Explanation:
?r is always more than 1. It cannot be 0 or less than 1.
Correct Answer: Armstrong oscillator
Correct Answer: A is wrong R is correct
Explanation:
Crystal has to be connected externally to pins 1 and 2 of 8085.
Correct Answer: - 0.6
Explanation:
Correct Answer: translation by a in s domain
Explanation:
£e-at f(t) = F(s + a).
Correct Answer: True
Correct Answer: is capacitor
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