Control And Communication

Question 1

What does C and C stand for?

Answer 1

Control and communication

Question 2

What is a converted supply?

Answer 2

A supply that’s had its voltage and/or its frequency altered

Question 3

What are the voltages used in C and C switchboards?

Answer 3

24V

115V 400Hz

Question 4

What and where is the earth testing facility for a 24V system?

Answer 4

There’s an inbuilt system and earth is tested on both positive and negative bus bars

It tests from the bus bar to earth and if it reads 0V then it knows there’s a fault

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

What are the 4 characteristics of a primary battery?

Answer 7

Non rechargeable
Small
Dry cell
Once discharged must be thrown away

Question 8

What are the 4 characteristics of a secondary battery?

Answer 8

Rechargeable
Can be as small as a AAA and get very big
Wet cells
Requires special charging equipment

Question 9

What is the unit for measuring the capacity of a battery?

Answer 9

Ah

Amp Hours

Question 10

What is the value of a charged cell?

Answer 10

2.1V

Question 11

What is the voltage across a discharged cell?

Answer 11

1.75V