SSC JE Electrical 2019 with solution SET-1 What is the reason behind using a centrifugal switch in a single-phase induction motor? To out in the capacitor during running conditions To cut-off the starting winding at an appropriate instant To improve the starting performance of the motor To protect the motor from overloading To out in the capacitor during running conditions To cut-off the starting winding at an appropriate instant To improve the starting performance of the motor To protect the motor from overloading ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The centrifugal switch is used to disconnect the starting winding of the motor once the motor approaches its normal operating speed i.e 50% – 70% speed.
SSC JE Electrical 2019 with solution SET-1 Identify the INCORRECT statement with regards to synchronous motors It is a constant speed motor The field winding is placed on the rotor It is a self-starting machine The armature winding is placed on the stator It is a constant speed motor The field winding is placed on the rotor It is a self-starting machine The armature winding is placed on the stator 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? 29 ohm 115 ohm 11.5 ohm 290 ohm 29 ohm 115 ohm 11.5 ohm 290 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 In the two wattmeter method, the readings of the two wattmeters are 500W, 500W respectively. The load power factor in a balanced 3-phase 3-wire circuit is: 0.9 1 0.5 0.8 0.9 1 0.5 0.8 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In two wattmeter method the phase angle is tanφ = √3(W1 − W2)/(W1 + W2) tanφ = √3(500 − 500)/(500 + 500) tanφ = 0° φ = tan−10° = 0° Power factor = cosφ PF = cos0° = 1
SSC JE Electrical 2019 with solution SET-1 Which of the following is the function of the moderator in a nuclear reactor? To slow down the fast-moving electron Stopping chain reaction Starting chain reaction Controlling chain reaction To slow down the fast-moving electron Stopping chain reaction Starting chain reaction Controlling chain reaction ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 Extension of moving iron ammeter range can be done by using Capacitor Multiplier Shunt Inductor Capacitor Multiplier Shunt Inductor ANSWER DOWNLOAD EXAMIANS APP
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