Dec 1

Question 1

What does c and c stand for ?

Answer 1

Control and communications

Question 2

Define a converted supply

Answer 2

A supply that has voltage and or frequency changed before distribution around the ship

Question 3

What are the main voltages used in the c and c switchboard

Answer 3

-24 volts dc
-115 volts, 400 hertz

Question 4

What and where is the earth testing facilities for 24 v dc

Answer 4

Control and communications switchboard

Question 5

What does tru stand for ?

Answer 5

Transformer rectifier unit

Question 6

What does RTR stand for

Answer 6

Rationalised transformer rectifier

Question 7

2 categories of batteries

Answer 7

Primary and secondary

Question 8

What are the the characteristics of the 2 batteries

Answer 8

Primary
- not rechargeable
-Known as dry cells
-Normally small
-Once discharged they are thrown away

-Secondary
-Rechargeable
-Known as wet cells
-Variety of sizes
-Require specialist recharging equipment

Question 9

What is the capacity of a a battery measured in?

Answer 9

Amp hours

Question 10

What is the voltage of a fully charged cell

Answer 10

-2.1v

Question 11

What is the voltage of a discharged cell

Answer 11

-1.75v