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SSC JE Electrical 2019 with solution SET-2

SSC JE Electrical 2019 with solution SET-2
 The number of valence electrons of P and Si are respectively?

5 and 4
4 and 4
4 and 5
3 and 4

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Phosphorus (P) has 15 electron i.e 2,8,5. Hence the number of electron in its outermost orbit is 5.
Silicon (Si) has 14 electron i.e 2,8,4. Hence the number of electrons in its outermost orbit is 4.

SSC JE Electrical 2019 with solution SET-2
Two coils are said to be ‘magnetically isolated’ provided the coefficient of coupling K

Is equal to zero
Is less than or equal to one
Is equal to one
Is less than one

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

When there is no mutual flux between two coils, they are said to be magnetically isolated. In this case. k = 0 and M = 0.

SSC JE Electrical 2019 with solution SET-2
While estimating the overhead lines, if the number of poles required is 14, then what is the estimated number of earth sets required?

3
5
4
2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

While estimating the overhead lines, the first and last pole is always earth connected and after every 3rd electrical pole, the fourth pole is earthed. Therefore, the approximate number of required ground set = 4
 

SSC JE Electrical 2019 with solution SET-2
Which of the following decides the direction of rotation of a shaded pole motor?

Supply voltage
Shaded and unshaded portion of the pole
Frequency of supply
Stator poles

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SSC JE Electrical 2019 with solution SET-2
The input for a condenser in a steam power plant comes from a/an

Turbine
Air preheater
Super heater
Economizer

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Condenser – Condenser is a heat exchanger in which cooling water is circulated through the tubes. The exhaust steam from the turbine enters the condenser where it is cooled and converted to condensate (water).
 


SSC JE Electrical 2019 with solution SET-2
The residential distribution system employs_____

Two-phase, four-wire
Three-phase, four-wire
Three-phase, three-wire
Single-phase, two-wire

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