MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A_THREE-PHASE_M-3_CONVERTER_IS_OPERATED_FROM_A_3-PHASE,_230_V,_50_HZ_SUPPLY_WITH_LOAD_RESISTANCE_R_=_10_‚ÄÖ√Ñ√∂‚ÀÖ√´¬¨‚ÀÇ._FIND_THE_VALUE_OF_FIRING_ANGLE_IF_AN_AVERAGE_OUTPUT_VOLTAGE_OF_50%_OF_THE_MAXIMUM_POSSIBLE_OUTPUT_VOLTAGE_IS_REQUIRED.?$# |
| A. | |
| B. | 92.7° |
| C. | 67.7° |
| Answer» C. 67.7¬¨¬®‚Äö√†√ª | |
| 2. |
A_three-phase_half-wave_controlled_converter_is_fed_from_a_3-phase,_400_V_source_and_is_connected_to_a_load_which_takes_a_constant_current_of_36_A._Find,the_value_of_average_output_voltage_and_average_current_rating_of_SCR_for_a_firing_angle_of_30°.$# |
| A. | 234 V, 36 A |
| B. | 234 V, 12 A |
| C. | 135 V, 36 A |
| D. | 135 V, 12 A |
| Answer» C. 135 V, 36 A | |
| 3. |
A three-phase three-pulse converter would operate as a line commutated inverter whe? |
| A. | 30° < α < 60° |
| B. | 90° < α <180° |
| C. | 90° > α |
| D. | it can never operate as a line commutated inverter |
| Answer» C. 90¬¨¬®‚Äö√†√ª > ‚âà√≠¬¨¬± | |
| 4. |
A three-phase three pulse type controlled converter is constructed using 3 SCR devices. The circuit is supplying an R load with α < 30°. As such, each SCR device would conduct for$ |
| A. | 60° each cycle |
| B. | 120° each cycle |
| C. | 180° each cycle |
| D. | 360° each cycle |
| Answer» C. 180¬¨¬®‚Äö√†√ª each cycle | |
| 5. |
In a three-phase, three-pulse, M-3 type controlled converter T1 starts to conduct at 30 + n°. At what angles do T2 and T3 start to conduct? Assume that the conduction sequence is T1-T2-T3.$ |
| A. | 2n° and 3n° |
| B. | 150 + n° and 270 + n° |
| C. | n° each |
| D. | 30 + n° and 60 + n° |
| Answer» C. n¬¨¬®‚Äö√†√ª each | |
| 6. |
A three-phase, three-pulse, M-3 type controlled converter has firing angle for one of the SCRs set as 15°. This SCR would start conducting at$ |
| A. | 0° |
| B. | 15° |
| C. | 30° |
| D. | 45° |
| Answer» E. | |
| 7. |
A three-phase, three-pulse, M-3 type controlled converter uses ____________ number of SCRs. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |