Hello could somebody see whether I've got any wronge. thanks
1A boiler requiring a greater waterflow rate through its heat exchanger than the heating and hot water circuitsrequire, should be fitted with
a) a pressure limiting valve
b) a flow restrictor
c) a pressure reducing valve
d)an automatic bypass valve.
2 To satisfy regulations, the controlsrequired for a fully pumped heating system (hot water
priority) using a zone valvearrangement, consists of
a) two number 2 position divertervalves, time clock, cylinder thermostat, room thermostat
b)3 port valve, programmer, room thermostat, cylinder thermostat, TRVs
c) 2 port valve, time clock, roomthermostat, cylinder thermostat, TRVs
d) 2 port valve, room thermostat,cylinder thermostat.
3 Which one of the following gasboilers overcomes the need for a cold water storage cistern, feed and expansioncistern and hot water storage vessel?
a) Back-boiler.
b) Condensing.
c)Combination.
d) Room-heater
4 If TRVs or zone valves on a systemclose, the purpose of the automatic by-pass valve is to make sure that
a) water can flow through the cylinder
b) air cannot enter the heating system
c) water cannot pump over the vent
d)water can flow through the boiler.
5 The revised Building RegulationsPart L1 require that when fitting a new oil fired heating system, the systemshould be
a) gravity hot water and pumpedheating
b)fully pumped with a boiler interlock
c) heated by combination boiler only
d) installed by CORGI registeredplumbers.
6 On a fully pumped system using a 3port mid-position valve, neither the heating nor hot water can be runindependently. The most likely cause is that the
a) cylinder thermostat is faulty
b) room thermostat is faulty
c)3 port valve is defective
d) pump is running constantly
7In an indirect system of heating andhot water, which includes a cold water storage cistern and a feed and expansioncistern
a)the water level in the feed and expansion cistern should be below that of thecold waterstorage cistern
b) the two cisterns bases should be atequal level
c) the water level in the feed andexpansion cistern should be above that of the cold water storage cistern
d) the water levels in the twocisterns should be equal.
8 Before filling a central heatingsystem for the first time, it is advisable to
a) remove all radiators and replaceeach with a piece of temporary piping
b) turn the pump on to assist with thefilling process
c) ensure that all radiator valves areleft in the closed position
d)remove the pump (accelerator) and replace with a piece of temporary piping.
22 Which of the following is regardedas best practice when branching a large new radiator circuit into an existingheating circuit in cold weather?
a)Drain the system down as the first action.
b) Branch into the pipework beforefitting the radiators.
c) Install the new radiators andpipework runs before branching in.
d) Install the radiators, branch intothe pipework and install the new pipework.