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- Question
Consider the amplitude modulated (AM) signal Ac cos ?ct + 2 cos ?mt cos ?ct For demodulating the signal using envelope detector, the minimum value of Ac should be
Options- A. 2
- B. 1
- C. 0.5
- D. 0
- Correct Answer
- 2
ExplanationAC cos ?ct + 2 cos ?mt cos ?ctAC cos?ct
for envelope detection ? < 1 ?
< 1 ? Ac should be at least-2.
More questions
- 1. The stud in a stud mounted SCR acts as
Options- A. anode
- B. cathode
- C. gate
- D. anode or cathode Discuss
Correct Answer: anode
- 2. As per temperature limits, the number of categories of solid dielectrics are
Options- A. 7
- B. 6
- C. 8
- D. 5 Discuss
Correct Answer: 7
- 3. In satellite communication, highly directional antennas are used to
Options- A. direct the spot beam to a particular region of space on Earth
- B. strengthen the beam to overcome the cosmic noise
- C. make corrections in change of polarisation of the beam
- D. select a particular channel in transmission and reception Discuss
Correct Answer: direct the spot beam to a particular region of space on Earth
- 4. For the transport lag G(j?) = e-j?T, the magnitude is always equal to
Options- A. 0
- B. 1
- C. 10
- D. 0.5 Discuss
Correct Answer: 1
Explanation:
Magnitude is 1.- 5. Ferroelectric materials are those which
Options- A. cannot be polarized
- B. have a permanent polarization
- C. have ae equal to zero
- D. have ?p = 0 Discuss
Correct Answer: have a permanent polarization
Explanation:
Ferroelectric materials have permanent polarization.- 6. A cable has an insulation resistance of 1010 ohms. If the length is doubled, the insulation resistance will be
Options- A. 2 x 1010 ?
- B. 0.5 x 1010 ?
- C. 1010 ?
- D. 4 x 1010 ? Discuss
Correct Answer: 0.5 x 1010 ?
Explanation:
Insulation resistance of cable is inversely proportional to length.- 7. The number of storage classes in C is
Options- A. 2
- B. 3
- C. 4
- D. 6 Discuss
Correct Answer: 4
Explanation:
C has four storage classes viz. automatic storage class, register storage class, static storage class and external storage class.- 8. A silicon controlled switch has :
Options- A. 2 leads
- B. 3 leads
- C. 4 leads
- D. 5 leads Discuss
Correct Answer: 4 leads
Explanation:
Anode, cathode, anode gate and cathode gate.- 9. Some ceramic materials become superconducting
Options- A. below liquid helium temperature
- B. between liquid helium and liquid nitrogen temperature
- C. above liquid nitrogen but below room temperature
- D. at room temperature Discuss
Correct Answer: below liquid helium temperature
- 10. In a stud mounted SCR, the stud is
Options- A. in thermal contact with heat sink
- B. insulated from heat sink
- C. in electrical and thermal contact with heat sink
- D. in either electrical or thermal contact with heat sink Discuss
Correct Answer: in electrical and thermal contact with heat sink
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