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WorksheetsElectrical Installation Fundamentals
Total questions: 26
Worksheet time: 13mins
A shock approaching ............................ is painful and could cause severe injury.
10 A
1.0 A
10 mA
1.0 mA
The severity of the shock depends on :
The amount of current flowing through the body.
The current’s path through the body.
The length of time the body remains in the circuit.
All of the above
Find the horizontal distance from the wall, for safe use of the ladder shown in the figure below.
120 in
30 in
3 in
40 in
Electricity is made at a .......................... by huge generators
power plant
Power transformer
Substation transformer
Electrical service panel
The generated electricity at power plant is in the range of ....................................
V
Mv
Gv
Kv
what is the name of this device?
Power plant
Power transformer
Step-up transformer
Step-down transformer
................................ where the voltage is lowered (step- down) so it can be sent on smaller power lines
power transformer
Substation transformer
Transmission lines
Power plant
The electrical charge goes through high-voltage ......................................... that stretch across the country.
Transmission lines
Power plant
Substation transformer
distribution lines
where smaller pole-top transformers reduce the voltage again to take the power safe to use in our homes.
distribution lines
Transmission lines
Electrical service panel
Main Distribution box (MDB)
is a component of an electricity supply system, which divides an electrical power feed into secondary circuits
Main Distribution box (MDB)
residual-current devices (RCD)
transmission lines
Fuse
What is/are the devices that are in MDB?( Select all true answers )
Fuse or circuit breaker
MCB
RCD
NFB
Three-phase power is commonly found in?
home electrical appliances.
Industrial applications and electrical distribution
electrical outlet in houses
buildings delivers
Distributing single-phase power uses ................ wires
5
3
2
1
Three-phase cable mainly uses ................... wires
5
1
2
3
Which type of cables is shown in the image below?
Single phase
Three phase
The color of live wire in single phase is ....................... ( you may choose more than one answer )
Red
Brown
Green and yellow
Yellow
The color of ground wire is...................
Red
Green
Yellow
Green and yellow
wires consist of two or more cables
True
False
RCD detects that the electric current is not balanced between the energized conductor (Life) and the return neutral conductor
True
False
........................... protect electrical devices such as motor from damage caused by over current and short circuit.
Residual Current Device (RCD)
Miniature Circuit Breaker (MCB)
No Fuse Breaker (NFB)
Earth Leakage Circuit Breaker (ELCB)
................................ protective device that shuts off power when the current exceeds a preset limit.
Residual Current Device (RCD)
Mains Distribution Box (MDB)
Miniature Circuit Breaker (MCB)
No Fuse Breaker (NFB)
................................ used to directly detect currents leaking to earth from an installation and cut the power
No Fuse Breaker (NFB)
Earth Leakage Circuit Breaker (ELCB)
Miniature Circuit Breaker (MCB)
Fuse
Earth impedance tends to be low in areas where there is a local grounding (earth) rod or when soil conditions are dry.
True
False
........................ protect the electrical installation from overloading
Fuse
Main switch
DIN rail
What is the name of this protective device?
MCB
RCD
ELCB
MDB
What is the name of this protective device?
ELCB
RCD
MDB
MCB
