Q1.a) Explain three methods of overcurrent protection for electrical circuit. (8)
b) Explain with aid of diagram, the meaning of the term inverse current time characteristic (8)
Q6. With Reference to 3-phase Transformers:
a) Discuss the essential and desirable conditions to be fulfil for operating two three-phase transformers in parallel. (5)
b) What are the advantages of transformer bank of three 1-phase transformers over a unit three phase transformer of the same kVA rating? (5)
c) In a 25 kW, 3300/233V, 1-phase transformer the iron and full load copper losses are 350 watts and 400 watts respectively. Calculate the efficiency at half load 0.8 P. F (6)
Q1. With respect to generators and main circuit breakers and their protection devices:
a) What are safeties incorporated in Air circuit breaker (ACB) of ship’s generator and prime mover? (10)
b) Write Short Note on Negative phase Sequence Relay. (6)
Q7. With Reference to Electrical Safety onboard a vessel:
a) Write Short note on “Electric Shock” (6)
b) Enumerate the relation between Shock Current Levels, the Applied Voltage and the Body resistance. (5)
c) How do you treat a person who has suffered an electric shock onboard from a AC supply? (5)
Q7. a) Describe the routine tests required for self-contained breathing apparatus sets (8)
b) Describe the procedure to be adopted to find missing personnel in a smoke-filled accommodation area. (8)
Username or email address *Required
Password *Required
Note: Entering wrong username in the login form will ban your IP address immediately. Entering wrong password multiple times will also ban your IP address temporarily.
Log in
Lost your password? Remember me
No account yet?
