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SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
The Thevenin’s resistance as seen through the terminals A and B is:

5 Ω
6 Ω
8 Ω
4 Ω

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SSC JE Electrical 2019 with solution SET-1
 Which of the following fuel has the least calorific value?

Kerosene oil
LPG
Hydrogen
Wood

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

In the above option, the wood has the lowest calorific value. Its value is around 17000 – 20000 kilojoule/kg.
The calorific value of LPG is 55000 kilojoule/kg.
The calorific value of Kerosene oil is 45000 kilojoule/kg.
The calorific value of hydrogen oil is 150000 kilojoule/kg.
 

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
190 V
210 V
215 V

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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
 An alternator has 9 slots/pole. What is the value of the pitch factor if each coil spans 8 slot pitches

Cos 10°
Cos 60°
Cos 45°
Cos 30°

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Coil Span = 8
Pole Pitch = 9 slots/pole
Slot angle (α) = 180° / Pole Pitch = 180°/9 = 20°
Pitch Factor = cos(α/2) = cos (20/2)
Pitch Factor = cos 10°
 

SSC JE Electrical 2019 with solution SET-1
 _____ power plant is the plant which uses a non-conventional source of energy

Hydroelectric
Nuclear
Thermal
Wind

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SSC JE Electrical 2019 with solution SET-1
 Two inductors of 4H and 6H are connected in series. The equivalent inductance of this combination is

2.4 H
6 H
4 H
10 H

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Total inductance when inductor are connected in series
L = L1 + L2
L = 4 + 6 =10H
 

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