18th edition part 2 mock 1

The algebraic sum of the currents in the live conductor of a circuit at a point in the electrical installation is known as the?

• a)       Return current
• b)        Surge current
• c)        Residual current
• d)        Design current

What is the maximum distance defined by 'arms reach? a) 1.25 m

• a) 1.25 m
• b) 0.75 m
• c)        2.5 m
• d)            6 m

What is this statement a definition of: 'Protection against electric shock under fault-free conditions?

• a)       Fault protection
• b)        Direct contact
• c)        Indirect contact
• d)        Basic Protection

Where can further information on Zx be found?

• a)        Part 2
• b)        Part 3
• c)        Appendix 4
• d)        Appendix 13

The freedom from supply interruption is known as?

• a)         Efficiency of supply
• b)        The no-break period
• c)         Continuity of service
• d)         Regular supply

In the case of a voltage disturbance causing a power frequency fault voltage appearing on the LV side, between the exposed-conductive parts and earth, what symbol is used?

• a)             Uo
• b)        Uf
• c)               Ux
• d)            U1

What is defined here: 'An enclosure of metal other than trunking or conduit, that is used for the protection of cables drawn in after the ducting is erected'?

• a)       Cable tray
• b)       Cable tunnel
• c)        Cable ducting
• d)       Cable ladder

A switching device capable of operation other than by hand is known as a?

• a)     Control and protective switching device
• b)     Manual relay
• c)      Contactless contactor
• d)     Automatic distribution device

Band II voltages do not exceed

• a)         2500 v de
• b)          1700 v de
• c)         1000 v ac r.m.s
• d)        1600 v ac r.m.s

What is the correct name for a protective conductor that provides equipotential bonding?

• a)         Bonding conductor
• b)        Earth conductor
• c)         Earthing conductor
• d)         Supplementary equipotential bonding conductor