ABSA 5th Class |250 questions with accurate answers
__________ heat is the amount of heat required to raise the temperature
of a unit mass of a substance 1 degree Celsius without changing the state
of the substance. Ans✓✓✓ Specific
___________ are the building blocks of all matter. Ans✓✓✓ atoms
____________ are required to prevent oil from spreading beyond the
confines of a heater in the event of a ruptured tube. Ans✓✓✓ Dikes
A complete electrical circuit must be ______________________.
Ans✓✓✓ continuous
A disadvantage of using threads to join pipes and fittings is?: Ans✓✓✓
the effective wall thickness is reduced
A draft gauge on a furnace indicates the draft in: Ans✓✓✓ mm of water
column
A flushometer (flush valve) is: Ans✓✓✓ a metering device.
A fuel storage tank must be located a minimum of ____ away from the
furnace Ans✓✓✓ 2 feet
,A Ground Fault Circuit Interrupter (GFI) works on comparing
__________ on different sides of the circuit. Ans✓✓✓ Current
A high limit control switch
a) is necessary on all boilers
b) activates after the safety valve opens
c) is a normally open switch
d) usually does not require manual resetting
e) must be used when a boiler is not under continuous supervision
Ans✓✓✓ E
A hot water circulation system which is difficult to balance due to the
length of pipe being different for each convector, is the ________
system Ans✓✓✓ Two pipe direct return
A hot water circulation system which is self-balancing as a result of
having all the circuits the same length is the _________. Ans✓✓✓ two-
pipe reverse return
A manufacturers welding method must ___________________.
Ans✓✓✓ be qualified under the applicable code
A method of backflow prevention which makes use of a separation
between the free flowing discharge of a potable water pipe and an open
,or non-pressure receiving vessel is called __________ backflow
prevention method. Ans✓✓✓ air gap
A more modern method of ridding a boiler of dissolved solids is:
Ans✓✓✓ continuous blowdown
A motor that has an extra winding in the stator to give added torque is
called a: Ans✓✓✓ Split-phase motor
A PFD is ____________________. Ans✓✓✓ A schematic of the
process flow of a plant (Process flow diagram)
A piping support device which allows axial movement of the pipe is the
__________. Ans✓✓✓ adjustable roller stand
A potential hazard of working in a confined space entry may be where
the work in progress could cause: Ans✓✓✓ equipment being used to
become a hazard
A purpose of a liquid refrigerant control or regulating valve is:
Ans✓✓✓ Isolate the high side from the low side.
A purpose of a steam trap is to: Ans✓✓✓ automatically drain
condensate from steam lines
A refractory burner disadvantage is: Ans✓✓✓ High initial cost
, A smoke detector employing a short beam carried between the light
source and receiver, both mounted in a single ceiling-mounted unit, is
called: Ans✓✓✓ A spot type photo-electric detector
A solenoid type fuel gas valve is held close by what? Ans✓✓✓ Fuel
pressure
A substance, which will absorb humidity inside a boiler during dry lay
up is: Ans✓✓✓ Activated alumina
A type of valve which can be operated by chains in the event of gauge
glass breaking Ans✓✓✓ Quick closing valve
A unit heater is constructed similar to: Ans✓✓✓ A duct furnace
A valve which often contains a dashpot to cushion the action of the
valve is the: Ans✓✓✓ lift check valve
A very popular packaged boiler gas burner is the: Ans✓✓✓ Ring
burner
A weld made from both sides of the joint between two pieces of metal
is? Ans✓✓✓ A double weld
__________ heat is the amount of heat required to raise the temperature
of a unit mass of a substance 1 degree Celsius without changing the state
of the substance. Ans✓✓✓ Specific
___________ are the building blocks of all matter. Ans✓✓✓ atoms
____________ are required to prevent oil from spreading beyond the
confines of a heater in the event of a ruptured tube. Ans✓✓✓ Dikes
A complete electrical circuit must be ______________________.
Ans✓✓✓ continuous
A disadvantage of using threads to join pipes and fittings is?: Ans✓✓✓
the effective wall thickness is reduced
A draft gauge on a furnace indicates the draft in: Ans✓✓✓ mm of water
column
A flushometer (flush valve) is: Ans✓✓✓ a metering device.
A fuel storage tank must be located a minimum of ____ away from the
furnace Ans✓✓✓ 2 feet
,A Ground Fault Circuit Interrupter (GFI) works on comparing
__________ on different sides of the circuit. Ans✓✓✓ Current
A high limit control switch
a) is necessary on all boilers
b) activates after the safety valve opens
c) is a normally open switch
d) usually does not require manual resetting
e) must be used when a boiler is not under continuous supervision
Ans✓✓✓ E
A hot water circulation system which is difficult to balance due to the
length of pipe being different for each convector, is the ________
system Ans✓✓✓ Two pipe direct return
A hot water circulation system which is self-balancing as a result of
having all the circuits the same length is the _________. Ans✓✓✓ two-
pipe reverse return
A manufacturers welding method must ___________________.
Ans✓✓✓ be qualified under the applicable code
A method of backflow prevention which makes use of a separation
between the free flowing discharge of a potable water pipe and an open
,or non-pressure receiving vessel is called __________ backflow
prevention method. Ans✓✓✓ air gap
A more modern method of ridding a boiler of dissolved solids is:
Ans✓✓✓ continuous blowdown
A motor that has an extra winding in the stator to give added torque is
called a: Ans✓✓✓ Split-phase motor
A PFD is ____________________. Ans✓✓✓ A schematic of the
process flow of a plant (Process flow diagram)
A piping support device which allows axial movement of the pipe is the
__________. Ans✓✓✓ adjustable roller stand
A potential hazard of working in a confined space entry may be where
the work in progress could cause: Ans✓✓✓ equipment being used to
become a hazard
A purpose of a liquid refrigerant control or regulating valve is:
Ans✓✓✓ Isolate the high side from the low side.
A purpose of a steam trap is to: Ans✓✓✓ automatically drain
condensate from steam lines
A refractory burner disadvantage is: Ans✓✓✓ High initial cost
, A smoke detector employing a short beam carried between the light
source and receiver, both mounted in a single ceiling-mounted unit, is
called: Ans✓✓✓ A spot type photo-electric detector
A solenoid type fuel gas valve is held close by what? Ans✓✓✓ Fuel
pressure
A substance, which will absorb humidity inside a boiler during dry lay
up is: Ans✓✓✓ Activated alumina
A type of valve which can be operated by chains in the event of gauge
glass breaking Ans✓✓✓ Quick closing valve
A unit heater is constructed similar to: Ans✓✓✓ A duct furnace
A valve which often contains a dashpot to cushion the action of the
valve is the: Ans✓✓✓ lift check valve
A very popular packaged boiler gas burner is the: Ans✓✓✓ Ring
burner
A weld made from both sides of the joint between two pieces of metal
is? Ans✓✓✓ A double weld
