SSC JE Electrical 2019 with solution SET-1 A coil is wound with 50 turns and a current 8A produces a flux of 200μWb. Calculate the inductance of the coil 0.125 mH 1.25 mH 2.5 mH 0.25 mH 0.125 mH 1.25 mH 2.5 mH 0.25 mH ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The inductance of the coil is given by the relationL = Nφ/IWhereN = number of turns = 50φ = flux = 200μWbI = current = 8 AL = 50 × 200 × 10−6 ⁄ 8L = 1.25 mH
SSC JE Electrical 2019 with solution SET-1 Which of the following lamps employs a bimetallic strip? Mercury vapor lamp Fluorescent lamp Incandescent lamp Sodium vapor lamp Mercury vapor lamp Fluorescent lamp Incandescent lamp Sodium vapor lamp ANSWER DOWNLOAD EXAMIANS APP
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 5Hz 2.5Hz 50Hz 25Hz 5Hz 2.5Hz 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 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: 0.5 0.9 0.8 1 0.5 0.9 0.8 1 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 ______ Opposes the change in circuit voltage Inductance Inductive reactance Resistance Capacitance Inductance Inductive reactance Resistance Capacitance ANSWER DOWNLOAD EXAMIANS APP
SSC JE Electrical 2019 with solution SET-1 The ratio of average energy demand to maximum demand during a specific period in Load factor Form factor Power factor Utilization factor Load factor Form factor Power factor Utilization factor ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The ratio of average energy demand to maximum demand during a specific period is called the load factor.Load Factor = Average Load/Maximum Demand
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