ABSA: 4th Class Part B - Comprehensive Exam 2
questions with verified answers
__________ dampers have the blades linked so the adjacent blades
rotate in opposite directions.
Select one:
a. Opposed blade
b. Fire
c. Bypass
d. Parallel blade Ans✓✓✓ a
A boiler with a single safety valve has a maximum allowable working
pressure of 1000 kPa. What is the maximum boiler pressure permissible
when the safety valve is blowing?
Select one:
a. 1100 kPa
b. 1030 kPa
c. 1000 kPa
d. 1060 kPa Ans✓✓✓ d
A deep seal plumbing trap has a water seal depth of:
Select one:
,a. The inside diameter of the pipe
b. The outside diameter of the pipe
c. 5 cm
d. 10 cm Ans✓✓✓ d
A gas turbine compressor:
Select one:
a. must be a multi-stage compressor
b. must be intercooled
c. can be driven by the load turbine
d. is always an axial compressor Ans✓✓✓ c
A high stack temperature in a hot oil heater may indicate:
Select one:
a. Inadequate combustion air
b. A tube failure
c. Excessive oil flow
d. Improper fuel-air ratio Ans✓✓✓ b
A large journal bearing which is running hotter than normal can be
cooled by:
,Select one:
a. pumping additional grease into it
b. Decreasing the viscosity of the oil by cooling it
c. Loosening the bearing caps
d. Direct application of cool water Ans✓✓✓ c
A light fuel oil flame should
Select one:
a. be bright yellow, with smoke at the tips of the flame.
b. be predominantly blue, with orange at the tips of the flame.
c. be bright yellow, with orange at the tips of the flame.
d. impinge on the refractory, to stabilize ignition. Ans✓✓✓ c
A liquid trap located in the suction line before a refrigeration
compressor, which evaporates liquid refrigerant and returns it to the
compressor as a gas, is called:
Select one:
a. An accumulator
b. A distributor
c. A strainer-drier
d. An oil separator Ans✓✓✓ a
, A low temperature catalytic heater contains a layer of:
Select one:
a. A ceramic mat impregnated with a catalyst
b. Glass wool impregnated with a catalyst
c. Wool fiber impregnated with a catalyst
d. Metal impregnated with a ceramic material Ans✓✓✓ b
A luminaire is
Select one:
a. a complete lighting unit
b. the SI term for "candle power"
c. a measurement of refracted light
d. a measurement of reflected light Ans✓✓✓ a
A material that is commonly used as a solid lubricant is:
Select one:
a. Tallow
b. Lime
c. Molybdenum disulfide
questions with verified answers
__________ dampers have the blades linked so the adjacent blades
rotate in opposite directions.
Select one:
a. Opposed blade
b. Fire
c. Bypass
d. Parallel blade Ans✓✓✓ a
A boiler with a single safety valve has a maximum allowable working
pressure of 1000 kPa. What is the maximum boiler pressure permissible
when the safety valve is blowing?
Select one:
a. 1100 kPa
b. 1030 kPa
c. 1000 kPa
d. 1060 kPa Ans✓✓✓ d
A deep seal plumbing trap has a water seal depth of:
Select one:
,a. The inside diameter of the pipe
b. The outside diameter of the pipe
c. 5 cm
d. 10 cm Ans✓✓✓ d
A gas turbine compressor:
Select one:
a. must be a multi-stage compressor
b. must be intercooled
c. can be driven by the load turbine
d. is always an axial compressor Ans✓✓✓ c
A high stack temperature in a hot oil heater may indicate:
Select one:
a. Inadequate combustion air
b. A tube failure
c. Excessive oil flow
d. Improper fuel-air ratio Ans✓✓✓ b
A large journal bearing which is running hotter than normal can be
cooled by:
,Select one:
a. pumping additional grease into it
b. Decreasing the viscosity of the oil by cooling it
c. Loosening the bearing caps
d. Direct application of cool water Ans✓✓✓ c
A light fuel oil flame should
Select one:
a. be bright yellow, with smoke at the tips of the flame.
b. be predominantly blue, with orange at the tips of the flame.
c. be bright yellow, with orange at the tips of the flame.
d. impinge on the refractory, to stabilize ignition. Ans✓✓✓ c
A liquid trap located in the suction line before a refrigeration
compressor, which evaporates liquid refrigerant and returns it to the
compressor as a gas, is called:
Select one:
a. An accumulator
b. A distributor
c. A strainer-drier
d. An oil separator Ans✓✓✓ a
, A low temperature catalytic heater contains a layer of:
Select one:
a. A ceramic mat impregnated with a catalyst
b. Glass wool impregnated with a catalyst
c. Wool fiber impregnated with a catalyst
d. Metal impregnated with a ceramic material Ans✓✓✓ b
A luminaire is
Select one:
a. a complete lighting unit
b. the SI term for "candle power"
c. a measurement of refracted light
d. a measurement of reflected light Ans✓✓✓ a
A material that is commonly used as a solid lubricant is:
Select one:
a. Tallow
b. Lime
c. Molybdenum disulfide
