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- Question
Match the following:
Microwave Measuring Instruments Measurements Effected A. Bolometer 1. Reflection coefficients B. VSWR meter 2. Half power beam widths C. Cavity wave meter 3. Microwave power D. Pattern recorder 4. Microwave frequency
Options- A. A-2, B-1, C-4, D-3
- B. A-3, B-1, C-4, D-2
- C. A-2, B-4, C-1, D-3
- D. A-3, B-4, C-1, D-2
- Correct Answer
- A-3, B-1, C-4, D-2
- 1. Noise generated in a resistor is also known as
Options- A. partition noise
- B. white noise
- C. thermal noise
- D. shot noise Discuss
- 2. A reactor is used in a dual converter operating in non-circulating current mode.
Options- A. True
- B. False Discuss
- 3. The colour code on a carbon resistor is red-red-black-silver. The value of resistor is
Options- A. 22000 ?
- B. 2200 ?
- C. 22 ± 5% ?
- D. 22 ± 10% ? Discuss
- 4. A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of
Options- A. copper decreases and germanium increases
- B. both decreases
- C. both increases
- D. copper increases and germanium decreases Discuss
- 5. When a dielectric is subjected to an electric field E, each volume element of dielectric can be considered to be carrying an electric dipole moment.
Options- A. True
- B. False Discuss
- 6. As regards ?0 and ?r (absolute and relative permittivity)
Options- A. both ?0 and ?r can be interpreted in terms of atomic properties of medium
- B. only ?r can be interpreted in terms of atomic properties of medium
- C. only ?0 can be interpreted in terms of atomic properties
- D. ?r has no physical significance Discuss
- 7. At a very low temperature, a semiconductor
Options- A. becomes a conductor
- B. becomes an insulator
- C. may become a conductor or an insulator
- D. will remain a semiconductor becomes a conductor or an insulator Discuss
- 8. As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equal to an integer times
.
Options- A. True
- B. False Discuss
- 9. In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be
Options- A. 0.5 T
- B. less than 0.5 T
- C. more than 0.5 T
- D. 0.5 T or more or less Discuss
- 10. Transformer oil is
Options- A. refined vegetable oil
- B. refined mineral oil
- C. mixture of vegetable and mineral oil
- D. none of the above Discuss
More questions
Correct Answer: thermal noise
Correct Answer: False
Explanation:
Reactor is used only for circulating current mode.
Correct Answer: 22 ± 10% ?
Correct Answer: copper decreases and germanium increases
Explanation:
As temperature is decreased, resistance of conductors decreases and resistance of semiconductors increases.
Correct Answer: True
Correct Answer: only ?r can be interpreted in terms of atomic properties of medium
Correct Answer: becomes an insulator
Explanation:
Semi conductor becomes insulator at very low temperature.
Correct Answer: True
Explanation:
It is a quantum condition postulated by Bohr.
Correct Answer: less than 0.5 T
Explanation:
Because cast iron has lower permeability than silicon steel.
Correct Answer: refined mineral oil
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