P And D 2

Question 1

What does C and C stand for

Answer 1

Control and communications

Question 2

Define what a converted supply is

Answer 2

Is a voltage or frequency that has been changed before distribution around a ship

Question 3

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

Answer 3

24V DC and 150V 400 Hertz

Question 4

What and where is the earth testing facilities for 24 V DC

Answer 4

An earth test panel on the switchboard provides for testing the positive and negative sides of the DC supply.
A push button with an integral lamp is fitted to the switch board

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

Batteries fall into 2 categories what are they

Answer 7

Primary and secondary

Question 8

What are the characteristics of the 2 types of batteries

Answer 8

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

Secondary - rechargeable,
need specialist charging equipment,
Known as wet cells,
Come in a variety of sizes

Question 9

What are the capacity of a battery measured in

Answer 9

Measured in an amp-hour (Ah) rate

Question 10

What is the voltage of a fully charged cell

Answer 10

2.1V fully charged

Question 11

What is the voltage of a discharged cell

Answer 11

1.75V discharged