ETO ETO Exam papers 📅 Dec 2023

Exam Question

(a) What are the factors which determine the synchronous speed of a motor? (6)

(b) A three-phase induction motor is wound for four poles and is supplied from a 50 Hz system. Calculate: (10)

(i) The synchronous speed

(ii) The speed of the rotor when the slip is 4 per cent

(iii) The rotor frequency when the speed of the rotor is 600 r/min.

Reference Answer

(a) The synchronous speed of an AC motor is determined by two primary factors:
Supply Frequency (f)
Number of Poles (P)
The relationship between these factors and the synchronous speed (Ns) is given by the formula:

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play