SSC JE Electrical 2019 with solution SET-1 When the supply to the excitation fails, the synchronous generator acts like a/an Induction motor Synchronous generator Induction generator Synchronous motor Induction motor Synchronous generator Induction generator Synchronous motor ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 Identify the INCORRECT statement with regards to synchronous motors It is a constant speed motor It is a self-starting machine The armature winding is placed on the stator The field winding is placed on the rotor It is a constant speed motor It is a self-starting machine The armature winding is placed on the stator The field winding is placed on the rotor ANSWER EXPLANATION DOWNLOAD EXAMIANS APP A synchronous motor is not a self-starting motor. You can check out this article why synchronous motor is not self starting
SSC JE Electrical 2019 with solution SET-1 An electric heater is connected across 230V and it draws a current of 2A. Then the resistance offered by the heater is? 290 ohm 29 ohm 11.5 ohm 115 ohm 290 ohm 29 ohm 11.5 ohm 115 ohm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP GivenVoltage V = 230 VCurrent I = 2 AResistance R = V/IR = 230/2 = 115 Ω
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 1.33 A 0 A 1.66 A 0.66 A 1.33 A 0 A 1.66 A 0.66 A ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 What would the total loss of the 2kVA transformer corresponding to maximum efficiency be, provided the transformer has the iron of 150 W and full-load copper loss of 250W? 400 W 300 W 100 W 500 W 400 W 300 W 100 W 500 W ANSWER EXPLANATION DOWNLOAD EXAMIANS APP When variable loss becomes equal to the constant loss, efficiency is maximum.Losses = Pi + PcSince copper loss is a variable loss thereforeLosses = Pi + Pi = 2piThus at a maximum efficiency of this transformer total loss= 150 x 2 = 300 W
SSC JE Electrical 2019 with solution SET-1 An alternator has 9 slots/pole. What is the value of the pitch factor if each coil spans 8 slot pitches Cos 30° Cos 45° Cos 60° Cos 10° Cos 30° Cos 45° Cos 60° Cos 10° ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Coil Span = 8Pole Pitch = 9 slots/poleSlot angle (α) = 180° / Pole Pitch = 180°/9 = 20°Pitch Factor = cos(α/2) = cos (20/2)Pitch Factor = cos 10°
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