It reveals that the speed or generated EMF lags by 90° the flux that generates it, and is true when flux is time invariant and is sine distributed in space. 5. In a short pitched coil, the coil pitch factor kp, is given by ____________
A. kp = cosε
B. kp = cosε/2
C. kp = √2πfrNΦcosε
D. kp = cosε/2cosωrt
Answer:A
It reveals that the speed or generated EMF lags by 90° the flux that generates it, and is true when flux is time invariant and is sine distributed in space. 5. In a short pitched coil, the coil pitch factor kp, is given by ____________
A. kp = cosε B. kp = cosε/2 C. kp = √2πfrNΦcosε D. kp = cosε/2cosωrt
Explanation: The effect of short pitched coil is to reduce the generated EMF, and this reduction factor is cosε/2, and is referred to as coil pitch factor. 6. Which of the following equations represents the RMS value of the generated EMF in a short-pitched N-turn armature coil of an AC machine ____________