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WorksheetsEAL unit 4 revision 2
Total questions: 15
Worksheet time: 8mins
Additional protection is applicable to:
HRC fuse
BS 3036 rewireable fuse
RCBO
CB
which of the following would not operate if the line conductor bypasses the load and shorts out against the neutral conductor?
HRC fuse
RCD
RCBO
CB
coordination of fuses during fault or overload conditions is known as:
Diversity
Diverging
Discrimination
Deviation
A circuit breaker has two modes of operation:
overload due to thermal effect, or short circuit due to magnetic trip
overload due to magnetic trip or short circuit due to thermal
overload due to chemical reaction, or short circuit due to magnetic trip
overload due to thermal trip, or short circuit due to chemical reaction
A CB rated at 40A will trip:
only when a short circuit occurs
only when an overload occurs
when an overload, short circuit or earth fault occurs
when 41A flows through it
An RCD rated at 30mA will trip:
when enough current flows to earth
when an overload occurs
when the load reaches 30mA
when a L-N short circuit occurs
which type of CB is associated with commercial applications, especially fluorescent lighting?
type 3
type B
type C
type D
Which devices will detect an imbalance between the line and neutral, overload and all type of overcurrent fault?
RCD
RCBO
CB
BBC
A fuse protects:
the person
the switch
the cable
the load
an RCD protects
the person
the switch
the cable
the load
A value that ensures that a circuit breaker can withstand a fault current is known as:
breaking capacity
rating
thermal constraint
shock protection
the normal ICN value of a domestic CB is:
1KA
6KA
8KA
10KA
the protection provided by insulating live parts is called:
Extraneous protection
Basic protection
Fault protection
Additional protection
Ladder racking is a system for:
allowing access to storage racks
allowing multiple section extension ladders
supporting armoured cables
supporting vertical cable basket systems
An appropriate wiring method for an underground feed to a remote building would be:
metal conduit
trunking and tray
PVC cables
PVC/SWA cables
