MGVCL Exam Paper (30-07-2021 Shift 1) The miniature circuit breaker (MCB) shown in figure is five pole MCB four pole MCB two pole MCB three pole MCB five pole MCB four pole MCB two pole MCB three pole MCB ANSWER DOWNLOAD EXAMIANS APP
MGVCL Exam Paper (30-07-2021 Shift 1) The frequency of the emf in the stator of a 4-pole induction motor is 50 Hz, and that in the rotor is 2 Hz. What is the slip and at what speed is the motor running? 4%, 1440 rpm 3%, 1455 rpm 3%, 1440 rpm 4%, 1455 rpm 4%, 1440 rpm 3%, 1455 rpm 3%, 1440 rpm 4%, 1455 rpm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Rotor frequency, f_r = s*f_ss = 2/50s = 0.04Ns = 120f/PNs = 1500 rpms = (Ns - Nr)/NsNr = Ns(1 - s)Nr = 1500*(1 - 0.04)Nr = 1440 rpm
MGVCL Exam Paper (30-07-2021 Shift 1) In a single phase energy meter, the series electromagnet is energized by a ___ of ___ current coil, thin wire of more turns current coil, thick wire of few turns voltage coil, thin wire of more turns voltage coil, thick wire of few turns current coil, thin wire of more turns current coil, thick wire of few turns voltage coil, thin wire of more turns voltage coil, thick wire of few turns ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The series electromagnet is energized by a coil known as current coil which is connected in series with the load so that it carry the load current.The flux produced by this magnet is proportional to and in phase with the load current.
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) The air envelope surrounding the earth is called ___ Lithosphere Atmosphere Asthenosphere Hydrosphere Lithosphere Atmosphere Asthenosphere Hydrosphere ANSWER DOWNLOAD EXAMIANS APP
MGVCL Exam Paper (30-07-2021 Shift 1) Two-wattmeter method is used to measure the power taken by a 3-phase induction motor on no load. The wattmeter readings are 375 W and –50 W. Calculate the reactive power taken by the load. 325√3 VAR 425√3 VAR 425/√3 VAR 325/√3 VAR 325√3 VAR 425√3 VAR 425/√3 VAR 325/√3 VAR ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Reactive power taken, Q = √3*(W1 - W2)Q = √3*(375 + 50)Q = √3*425 kVAR
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