EE MCQ

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SSC JE Electrical 2019 with solution SET-2
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If the number of poles in an 11 KV transmission line is 80, then how many disc insulators are required?

No of disc required for 11 kV transmission line = 1 disc

Since the transmission line is 3-phase, therefore, the number of discs required for a single-pole will be 3.

Total no. of poles = 80

No of disc = 3 × 80 = 240

SSC JE Electrical 2019 with solution SET-2
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Which of the following is NOT related to the transmission and distribution of electric power?

The stroboscopic effect is a visual phenomenon that happens when a blinking light source glows an object in movement, generating a sequence of samples. The stroboscopic effect is based on Illuminance hence it is not related to the transmission and distribution of electric power.

SSC JE Electrical 2019 with solution SET-2
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If a circular conductor carries a current of ‘I’ ampere having radius ‘r’ meter, then the magnetizing force at the center of the coil is given by

Magnetic Field Strength (H) gives the quantitative measure of strongness or weakness of the magnetic field.

H = B/μo

Where

B = Magnetic Flux Density

μo = Vacuum Permeability

The magnetic Field strength at the center of circular loop carrying current I is given by

B = μoI/2r

B/μo = I/2r

H = I/2r At/m

Where r = Radius

SSC JE Electrical 2019 with solution SET-2
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IL = Load Current, then the relation between these currents for a DC series generator is

When the field winding is connected in series with the armature winding while supplying the load then the generator is called a series generator.

Current Relations

As all armature, field, and load are in series they carry the same current.

IL = Ise = Ia