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A 4 pole lap wound dc shunt motor rotates at the speed of 1500 rpm, has a flux of 0.4 mWb and the total number of conductors are 1000. What is the value of emf? (A) 100 Volts. (B) 0.1 Volts. (C) 1 Volts. (D) 10 Volts.

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A 4 pole lap wound dc shunt motor rotates at the speed of 1500 rpm, has a flux of 0.4
mWb and the total number of conductors are 1000. What is the value of emf?
 (A) 100 Volts. (B) 0.1 Volts.
 (C) 1 Volts. (D) 10 Volts.
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1 Answer

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Ans: D
 Given N = 1500 rpm, Φ = 0.4 mWb, Z = 1000, P = 4, & A= 4
 Therefore, Eb = NΦPZ / 60 A
 = 1500 x 0.4 x 4 x 1000 x 10^-3 / 60 x 4
 = 60/6 = 10 volts
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