MGVCL Exam Paper (30-07-2021 Shift 1) If a 415 V, 50 Hz, star-connected, three-phase squirrel-cage induction motor is operated from a 415 V, 70 Hz supply, the torque that the motor can now provide while drawing rated current from the supply increases remains the same increases or reduces depending upon the rotor resistance reduces increases remains the same increases or reduces depending upon the rotor resistance reduces ANSWER DOWNLOAD EXAMIANS APP
MGVCL Exam Paper (30-07-2021 Shift 1) The operating time of an inverse definite minimum time (IDMT) overcurrent relay corresponding to plug-setting multiplier (PSM) = 1 and time-multiplier setting (TMS) = 1 will be 3 sec zero infinite 1 sec 3 sec zero infinite 1 sec ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Equation of operating time for IDMT relay (t) = 0.14*TMS/[(PSM^0.02) - 1]Here,PSM = TMS = 1So,t = 0.14*1/(1 - 1)t = infinite
MGVCL Exam Paper (30-07-2021 Shift 1) For protection of inter-turn fault in transformer, the relays preferred are Buchholz's relay and differential relay Overcurrent relay and differential relay Overcurrent relay and Buchholz's relay Buchholz's relay, overcurrent relay and differential relay Buchholz's relay and differential relay Overcurrent relay and differential relay Overcurrent relay and Buchholz's relay Buchholz's relay, overcurrent relay and differential relay ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Intern turn winding fault can be easily detect by differential protection relay.Also detect by buchholz relay (gas operated relay), cause buchholz relay is used to detect the internal fault of transformer.
MGVCL Exam Paper (30-07-2021 Shift 1) Which of the following are the advantages of Aerial Bunched Cables (ABC)? Higher safety and reliability Elimination of theft of energy Reduced height of supports All of these Higher safety and reliability Elimination of theft of energy Reduced height of supports All of these ANSWER DOWNLOAD EXAMIANS APP
MGVCL Exam Paper (30-07-2021 Shift 1) An electric potential field is produced in air by point 1 μC and 4 μC located at (-2, 1, 5) and (1, 3, -1) respectively. The energy stored in the field is 10.28 mJ 2.57 mJ 12.50 mJ 5.14 mJ 10.28 mJ 2.57 mJ 12.50 mJ 5.14 mJ ANSWER DOWNLOAD EXAMIANS APP
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