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SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
 Prevention of interference with neighboring telephone lines can be done by:

Reducing corona
Reducing skin effect
Transposing transmission lines
Using bundled conductors

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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?

11.5 ohm
115 ohm
29 ohm
290 ohm

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Given
Voltage V = 230 V
Current I = 2 A
Resistance R = V/I
R = 230/2 = 115 Ω
 

SSC JE Electrical 2019 with solution SET-1
 An electric motor in which both the rotor and stator fields rotate with the same speed is called

DC motor
Universal motor
Synchronous motor
Induction motor

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In the synchronous motor, the stator and rotor rotate at the same speed.
 

SSC JE Electrical 2019 with solution SET-1
 The power factor of an A.C. circuit is equal to

Z/R
R/XC
R/Z
R/XL

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In electrical engineering, the power factor of an AC electrical power system is defined as the ratio of the real power flowing to the load to the apparent power in the circuit ” R/Z”.
 

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

0.25 mH
2.5 mH
1.25 mH
0.125 mH

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The inductance of the coil is given by the relation
L = Nφ/I
Where
N = number of turns = 50
φ = flux = 200μWb
I = current = 8 A
L = 50 × 200 ×  10−6 ⁄ 8
L = 1.25 mH

SSC JE Electrical 2019 with solution SET-1
 Which of the following losses is together called iron losses?

Eddy current loss and frictional loss
Hysteresis loss and copper loss
Hysteresis loss and frictional loss
Eddy current loss and hysteresis loss

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