SSC JE Electrical 2019 with solution SET-1 Find the frequency of rotor induced EMF of a 3-phase, 440V, 50 Hz induction motor has a slip of 10% 25Hz 2.5Hz 5Hz 50Hz 25Hz 2.5Hz 5Hz 50Hz ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Given DataVoltage = 440 VFrequency = 50 HzSlip = 10% =0.1Now,Rotor frequency = slip × frequency= 0.1 × 50 = 5 Hz
SSC JE Electrical 2019 with solution SET-1 When the only current source is active in the circuit, find the current through the 10Ω resistor 1.66 A 0 A 0.66 A 1.33 A 1.66 A 0 A 0.66 A 1.33 A ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 The annual load factor of a generation station is equal to (No. of units actually supplied per year) ⁄ (Max. possible demand) (No. of units actually supplied per year) ⁄ (Max. possible demand) (No. of units actually supplied per month) ⁄ (Max. possible demand × 8760) (No. of units actually supplied per year) ⁄ (Max. possible demand × 8760) (No. of units actually supplied per year) ⁄ (Max. possible demand) (No. of units actually supplied per year) ⁄ (Max. possible demand) (No. of units actually supplied per month) ⁄ (Max. possible demand × 8760) (No. of units actually supplied per year) ⁄ (Max. possible demand × 8760) ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 A synchronous motor runs at 600rpm, which of the following case is true? P = 10, f = 60 Hz P = 12, f = 60 Hz P= 12, f = 50 Hz P = 8, f = 50 Hz P = 10, f = 60 Hz P = 12, f = 60 Hz P= 12, f = 50 Hz P = 8, f = 50 Hz ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Synchronous speed NS = 120f/PWhenP = 12 & F = 60 then Ns = ?NS = 120f/P = (120 × 60)/12 = 600 RPM
SSC JE Electrical 2019 with solution SET-1 If an alternator is operating at unity power factor, then its terminal voltage is Less than the induced EMF, with positive voltage regulation Less than the induced EMF, with negative regulation Greater than the induced EMF, with negative voltage regulation Equal to the induced EMF, with zero voltage regulation Less than the induced EMF, with positive voltage regulation Less than the induced EMF, with negative regulation Greater than the induced EMF, with negative voltage regulation Equal to the induced EMF, with zero voltage regulation ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 ______starting method CANNOT be used for starting a 3-phase squirrel cage induction motor Rotor-resistance Auto-transformer Star-delta Direct-on-line Rotor-resistance Auto-transformer Star-delta Direct-on-line ANSWER DOWNLOAD EXAMIANS APP
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