ETO ETO Exam papers 📅 Mar 2024

Exam Question

(a) Which of the following devices will prevent a DC generator from becoming motorized?

(i) Over current relay

(iii) Reverse power relay

(ii) Motorization trip

(iv) Reverse current relay

(b) Give a detailed explanations as to why other options were not considered

Reference Answer

The correct answer is: (d) Reverse current relay
A reverse current relay is specifically designed to prevent a DC generator from becoming motorized. If the generator loses its prime mover (e.g., due to fuel loss), its voltage drops. When operating in parallel, the other generator(s) in the system will cause current to flow back into the faulty generator, leading to reverse current. The reverse current relay detects this and trips the circuit breaker, protecting the generator from damage.
Reasons for not considering other options:
Overcurrent Relay (a):

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