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SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
 The function of condenser in a Thermal power plant is:

Purify water
Purify steam
Condense water
Condense used steam into water

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SSC JE Electrical 2019 with solution SET-1
 A magnetic circuit is applied with a current that changes at a rate of 5 A/sec. The circuit has an inductance of 2H, then the self-induced EMF is

−2.5 V
0.4 V
−4 V
−10 V

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Given
Inductance L = 2 H
Rate of change of current di/dt = 5 A/sec
Self induced EMF = − (Rate of change of current × Inductance) = −L(di/dt)
= −(5 × 2) = −10V
 

SSC JE Electrical 2019 with solution SET-1
 Which of the following is the function of the moderator in a nuclear reactor?

Controlling chain reaction
Stopping chain reaction
Starting chain reaction
To slow down the fast-moving electron

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SSC JE Electrical 2019 with solution SET-1
 A 200 V d.c machine as Ra = 0.5 Ω and its full-load Ia= 20A. Determine the induced e.m.f when the machine acts as a motor

200 V
210 V
215 V
190 V

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Given Data
Voltage Va = 200 v
Armature Resistance Ra = 0.5Ω
Armature Current Ia = 20 A
Induced EMF = Ea = ?
The Induced EMF of a DC machine working as a Motor is
Ea = Va − IaRa
Ea = 200 − 20 × 0.5
Ea = 190 V

SSC JE Electrical 2019 with solution SET-1
  ______starting method CANNOT be used for starting a 3-phase squirrel cage induction motor

Auto-transformer
Star-delta
Direct-on-line
Rotor-resistance

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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
50Hz
5Hz

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Given Data
Voltage = 440 V
Frequency = 50 Hz
Slip = 10% =0.1
Now,
Rotor frequency = slip × frequency
= 0.1 × 50 = 5 Hz
 

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