P & D 2

Question 1

What does C&C stand for?

Answer 1

Control & Communication

Question 2

Define what a converted supply is.

Answer 2

A converted supply is when the voltage and/or current is converted/ changed.

Question 3

What are the main voltages used in the C&C switchboard?

Answer 3

115v AC
24v DC

Question 4

What and where are the earth testing facilities for 24v DC?

Answer 4

There is a push-button with an integral lamp that is attached to the C&C 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

Batteries fall into 2 categories. What are they?

Answer 7

•Primary
•Secondary

Question 8

What are the characteristics of a primary battery?

Answer 8

•Not rechargeable.
•’Dry battery or cell’ even tho the electrolyte is a damp paste.
•Once discharged, they are thrown away.
•Normally small and used in torches, hearing aids, watches, and calculators.

Question 9

What are the characteristics of secondary batteries?

Answer 9

•Rechargeable.
•’Wet batteries/ cells’ the electrolyte is usually a liquid or a gel.
•Require specialist recharging equipment.
•Variety of sizes.

Question 10

What is the capacity of a battery measured in?

Answer 10

Amp-hour (Ah)

Question 11

What is the voltage of a fully charged cell?

Answer 11

2.1v

Question 12

What is the voltage of a discharged cell?

Answer 12

1.75v