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- Question
Match the following:
List I (Instrument) List II (Parameters) A. Moving coil galvanometer 1. High inertia, soft spring control B. Ballistic galvanometer 2. No control, high damping C. Vibration galvanometer 3. Soft spring control, critical damping D. Moving coil flux meter 4. Low inertia, tuned spring control
Options- A. A-4, B-2, C-3, D-1
- B. A-1, B-3, C-2, D-4
- C. A-2, B-1, C-4, D-3
- D. A-3, B-1, C-4, D-2
- Correct Answer
- A-3, B-1, C-4, D-2
- 1. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
Options- A. will be less than 100 N-m
- B. will be more than 100 N-m
- C. may be more or less than 100 N-m depending on motor parameters
- D. very small Discuss
- 2. The phenomenon of overlap in converter operation due to
Options- A. source resistance
- B. source inductance
- C. both source resistance and source inductance
- D. high value of firing angle Discuss
- 3. As the frequency is increased, the charging MVAR in a cable
Options- A. decreases
- B. increases
- C. remain the same
- D. decreases or remains the scheme Discuss
- 4. A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency
Options- A. must be a sub-multiple of input frequency
- B. can be any frequency
- C. must be an even sub-multiple of input frequency
- D. must be an odd sub-multiple of input frequency Discuss
- 5. If
, the terms in f(t) will have
Options- A. e-t and e-2t
- B. et and e2t
- C. te-t and te-2t
- D. none of the above Discuss
- 6. Out of modes TE20 and TE30 of propagation of electromagnetic engery
Options- A. both have the same cutoff frequency
- B. TE20 has lower cut off frequency as compared to TE30
- C. TE30 has lower cutoff frequency as compared to TE20
- D. either (a) or (c) Discuss
- 7. Two function g1(t) and g2(t) with correlation of 6 has average power of 4 and 5 respectively. The power of g1(t) + g2(t) is
Options- A. 9
- B. 21
- C. 3
- D. 15 Discuss
- 8. An SUS is
Options- A. exactly similar to SCR but with higher rating
- B. similar to UJT
- C. PUT and avalanche diode connected in anti parallel
- D. SCR and avalanche diode connected in parallel Discuss
- 9. The static equalisation circuit for thyristors connected in series is
Options- A. one resistor in series with each thyristor
- B. one resistor in parallel with each thyristor
- C. one resistor and one capacitor in parallel with each thyristor
- D. none of the above Discuss
- 10. The cut in voltages for germanium and silicon diodes respectively as
Options- A. 0.3 V and 0.7 V
- B. 0.7 V and 0.3 V
- C. 0.6 V and 0.9 V
- D. 0.5 V and 0.7 V Discuss
More questions
Correct Answer: will be more than 100 N-m
Correct Answer: source inductance
Explanation:
Source inductance delays turn off and hence causes overlap.
Correct Answer: increases
Explanation:
Charging current and MVAR are proportional to frequency.
Correct Answer: must be a sub-multiple of input frequency
Correct Answer: e-t and e-2t
Explanation:
(s + 1) term will give e-t and (s + 2) term will give e-2t .
Correct Answer: TE20 has lower cut off frequency as compared to TE30
Correct Answer: 21
Explanation:
Power of two correlated signal is P = P1 + P2 +2R1, 2(t).
Correct Answer: PUT and avalanche diode connected in anti parallel
Correct Answer: one resistor in parallel with each thyristor
Correct Answer: 0.3 V and 0.7 V
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