SSC JE Electrical Engineering 2012 Paper

Question : 101 of 200

Marks: +1, -0

ELECTRICAL

The emf induced per phase in a three-phase star connected synchronous generator having the following data :
Distribution factor = 0.955; Coil – span factor = 0.966; Frequency = 50 Hz; Flux per pole = 25 mwb; Turns per phase = 240, emf per phase is

2128.36 Volts
1228.81 Volts
869.46 Volts
1737.80 Volts

Validate

Solution:

Emf

E_\Pn= K_cK_d√2πfϕN_\pn

where

K_c

= Coil-span factor

K_d

= Distribution factor
ϕ= Flux per pole
f = Frequency

N_\Pn

= Twins per phase

E_\Pn

= 0.955 × 0.966 ×

√2

× π × 50 × 25 × 10

^{–3}

× 240

E_\Pn

= 1228.81 volts

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