41. A push pull inverter provides a
42. An inductor is connected in series with SCR to protect it from
43. The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of
44. An SCR triggered by a current pulse through its gate can be turned off by
45. A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and armature resistance are 100 volt and 0.5 Ω respectively. With the magnitude control ratio 0.6, the quadrant of operation DC motor is
46. Match List-I with List-II and select the correct answer using the options given below:
List-I (Semiconductor Device)
List-II (Application)
a. Triac
1. Used in HVDC system
b. IGBT
2. Used in pulse generation
c. SCR
3. Used in motor control circuits
d. UJT
4. Used in ac regulators
| List-I (Semiconductor Device) | List-II (Application) |
| a. Triac | 1. Used in HVDC system |
| b. IGBT | 2. Used in pulse generation |
| c. SCR | 3. Used in motor control circuits |
| d. UJT | 4. Used in ac regulators |
47. Which device is used in relaxation oscillator?
48. For a single phase half-wave controlled rectifier has 400sin314t as the input voltage and R as the load. For a firing angle of 60° for the SCR, the average output voltage is
49. What will be the one cycle surge current of a SCR if it has half cycle surge current rating of 5000 A for 50 Hz supply?
50. . . . . . . . . is the device which acts like an N-P-N and a P-N-P transistor connected base-tobase and emitter-to-collector.
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