Topic 7 Quiz

A current that is constantly changing direction is called:
1. AC
2. DC
3. H & C
4. WC
A lawnmower has the following information on a sticker. Which one represents the mains voltage?
1. 1200 W
2. 230 V
3. 50 Hz
4. 5.5 A
A lawnmower has the following information on a sticker. Which one represents the mains frequency?
1. 1200 W
2. 230 V
3. 50 Hz
4. 5.5 A
The time taken for one complete cycle of mains electricity is:
1. 1/60 s
2. 1/50 s
3. 1/5 s
4. 50 s
Which one of these statements best describes the job of a fuse?
1. It isolates the appliance from the Earth.
2. It is put in a plug to give extra work to electricians
3. It stops the user getting a shock.
4. It is a weak link that melts if there is too big a current.
In which wire(s) is the fuse found?
1. Live only
2. Neutral only
3. Earth only
4. Live and neutral
Which one of these devices is an essential safety device if you are using an appliance outside?
1. Fuse
2. Circuit breaker
3. Earth leakage circuit breaker
4. An adaptor
Which one of these appliances should have an Earth wire?
1. One with a plastic case.
2. One that has a painted metal case or a bare metal case
3. One that has a bare metal case only
4. One where there are exposed live parts.
The function of the earth wire is to:
1. To protect the user from shock in case of a fault.
2. To save the user from haveing to connect the neutral wire.
3. As an extra conductor so that the appliance can take more current.
4. To make wiring a plug a more satisfying job.
The earth wire works because:
1. The live wire is connected to the Earth at the substation and the ground provides a conducting path.
2. The live wire is connected to the Earth at the house.
3. The neutral wire is connected to Earth at the substation, and the ground provides a conducting path.
4. The neutral wire is connected to the Earth at the house.