Signaling Systems

Poll

How is your team feeling right now?

• Excited and Ready

• Not excited, but ready

• Not really ready

• Not ready at all

Multiple Choice

The single stroke bell can be used in a building as an alarm.

• True

• False

Multiple Choice

The trembler bell is so very different from the single stroke bell.

• True

• False

Multiple Choice

The continuous ringing bell can be used in____________.

• Churches

• Transport buses

• Entrepot Secondary School

• Aeroplanes

Multiple Choice

A _______ current in the coil can control a ______ current in an external circuit.

• large and small

• direct and alternative

• small and large

• alternative and direct

Multiple Choice

In a relay, when it has to be energized for the contacts to closed; this is called a ___________ relay.

• Normally open

• Normally closed

• Trasfer.

Multiple Choice

When a magnet moves close to a reed relay, the contacts _______.

• open

• closed

• remain unchaged

• can be any of the above

Multiple Choice

Which type of alarm is easier to disable?

• Normally open

• Normally closed

Multiple Choice

Which type of alarm system consumes more current?

• Normally open

• Normally closed