Discussion
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- Question
Assertion (A): Electron concentration n, hole concentration p and charge concentration ni are related by ni2 = np.
Reason (R): p type semiconductor is obtained by adding trivalent impurity to intrinsic semiconductor.
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
- Correct Answer
- Both A and R are true but R is not correct explanation of A
- 1. As regards dielectric constant ?r
Options- A. the units are farads/m
- B. the units are newton/coulomb
- C. it is dimensionless
- D. the units are farads Discuss
- 2. In ferromagnetic materials, the orientation between neighbouring permanent dipoles is parallel.
Options- A. True
- B. False Discuss
- 3. The amount of time between the creation and recombination of a free electron and hole is called
Options- A. relaxation time
- B. life time
- C. lorentz time
- D. collision time Discuss
- 4. Dielectric constant, under the condition of alternating fields, is a complex quantity.
Options- A. True
- B. False Discuss
- 5. A photoconductor is a
Options- A. conductor
- B. semiconductor
- C. insulator
- D. superconductor Discuss
- 6. Which of the following statement about the advantage of phase discriminator over the slope detector is false?
Options- A. Fewer tuned circuits
- B. Better linearity
- C. Greater limiting
- D. Much easier alignment Discuss
- 7. High IF in a superheat receiver
Options- A. improves selectivity
- B. increases tracking problems
- C. decreases tracking problems
- D. reduces adjacent channel rejection Discuss
- 8. Which of the following noise becomes of great importance at high frequencies?
Options- A. Transit-time noise
- B. Shot noise
- C. Flicker noise
- D. Agitation noise Discuss
- 9. The image frequency of a superheterodyne receiver is
Options- A. independent of the frequency at which the receiver is tuned
- B. always outside the operating range of the receiver
- C. typical to FM receivers only
- D. not rejected by the IF tuned circuits Discuss
- 10. In a radio receiver
Options- A. the local oscillator frequency is made higher than the incoming signal frequency
- B. the local oscillator frequency is made lower than the incoming signal frequency
- C. the local oscillator frequency is made equal to the incoming signal frequency Discuss
Materials and Components problems
Search Results
Correct Answer: it is dimensionless
Explanation:
?r is only a number and does not have any units.
Correct Answer: True
Correct Answer: life time
Correct Answer: True
Correct Answer: semiconductor
Correct Answer: Greater limiting
Correct Answer: increases tracking problems
Correct Answer: Transit-time noise
Correct Answer: typical to FM receivers only
Correct Answer: the local oscillator frequency is made higher than the incoming signal frequency
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