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- Question
Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a
Options- A. critical wavelength for TE10 mode is the same as that for TE02 mode
- B. critical wavelength for TE10 mode is one half of that for TE10 mode
- C. critical wavelength for TE10 mode is the same as that for TM10 mode
- D. critical wavelength for TE10 mode is double that for TE01mode
- Correct Answer
- critical wavelength for TE10 mode is the same as that for TM10 mode
- 1. Match the following:
List I (VCR system) List II (Azimuth angle) A. VHS 1. 7° B. Video 2000 2. 15° C. Betamax 3. 6°
Options- A. A-1, B-2, C-3
- B. A-1, B-3, C-2
- C. A-3, B-1, C-2
- D. A-3, B-2, C-1 Discuss
- 2. Match the following:
List I List II A. Copper 1. produces discrete energy level just above valence band B. Rubber 2. produces discrete energy level just below conduction band C. Antimony 3. large forbidden gap D. Boron 4. valence and conduction bands overlap
Options- A. A-1, B-2, C-4, D-3
- B. A-4, B-1, C-2, D-3
- C. A-4, B-3, C-1, D-2
- D. A-2, B-1, C-3, D-4 Discuss
- 3. The number of doped regions in a SCR is
Options- A. 2
- B. 3
- C. 4
- D. 5 Discuss
- 4. In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of
Options- A. 60°
- B. 90°
- C. 120°
- D. 180° Discuss
- 5. A loss less line of characteristic impedance Z0 is terminated in pure reactance of -jZ0 value. VSWR is
Options- A. 10
- B. 2
- C. 1
- D. infinity Discuss
- 6. A typical error rate on satellite circuits is one bit error in
Options- A. 107
- B. 103
- C. 102
- D. 1010 Discuss
- 7. In elemental dielectrics, the orientation and ionic polarization are absent.
Options- A. True
- B. False Discuss
- 8. 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 Discuss
- 9. The waveshape of output voltage of half bridge inverter is
Options- A. sinusoidal
- B. square
- C. triangular
- D. either (a) or (b) Discuss
- 10. The main utility of SCR is due to
Options- A. gate triggering
- B. high temperature triggering
- C.
triggering - D. high breakdown voltage Discuss
More questions
Correct Answer: A-3, B-1, C-2
Correct Answer: A-4, B-3, C-1, D-2
Correct Answer: 4
Explanation:
p = n = p = n.
Correct Answer: 180°
Correct Answer: infinity
Explanation:
A pure reactance does not absorb any power.
Therefore VSWR is infinite because |rv| = 1.
Correct Answer: 107
Correct Answer: True
Correct Answer: Variable sensitivity
Correct Answer: square
Correct Answer: gate triggering
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