SSC JE Electrical 2019 with solution SET-1
A three-phase induction machine, when it is operating like a motor, the range of slip is given by

0 ≤ s ≤ 1
−1 > s > −2
1 < a < 2
0 > s > −1

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SSC JE Electrical 2019 with solution SET-1
 Three lamps are connected in series across a 120V supply and take a current of 1.5A. If the resistance of two of the lamps is 30Ω, what is the resistance of the third lamp?

30Ω
20Ω
10Ω
40Ω

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SSC JE Electrical 2019 with solution SET-1
  In a capacitor start single phase induction motor the current in the:

Starting winding leads the voltage
Supply lines lead the voltage
The main winding leads the voltage
Starting winding lags the voltage

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SSC JE Electrical 2019 with solution SET-1
 Which of the following lamps has the shortest/less life span in working hours?

Fluorescent lamp
Mercury vapor lamp
Sodium vapor lamp
Incandescent lamp

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SSC JE Electrical 2019 with solution SET-1
 Let T be the net torque developed by the rotor runs at ω rad/s. What is the mechanical power developed?

Pmech = (ωT)/60
Pmech = (2πωT)/60
Pmech = ωT
Pmech = (2πωT)

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