ABSA: 4th Class Part B - Comprehensive Exam 4
questions wit verified answers
"Barking", as it occurs in a pulp mill, means:
Select one:
a. Cutting the logs into short lengths
b. The removal of bark from the logs
c. To wash the incoming logs
d. To chip the logs Ans✓✓✓ b
A _____ system uses a thermal fluid in place of steam or water, to
conduct heat from a central source to other vessels and heating coils in a
plant.
Select one:
a. Hot oil
b. Condensing
c. Closed
d. Low temperature heating Ans✓✓✓ a
A boiler feedwater isolation valve:
Select one:
a. May be a globe valve, provided water enters below the disc
,b. Should be located close to the feedwater pump
c. Must be a globe valve
d. Is used to isolate the deaerator Ans✓✓✓ a
A boiler furnace pre-purge:
Select one:
a. must last a specific amount of time.
b. happens only when the draft fans are at low speed.
c. can occur even if the boiler has a low water condition.
d. happens after the ignition transformer is energized. Ans✓✓✓ a
A boiler pressure explosion:
Select one:
a. Could result from a defective flame scanner
b. May be caused by a low water condition
c. Could be the result of inadequate ignition
d. Could be the result of water in the fuel oil Ans✓✓✓ b
A chemical dot placed under the lens of a sight glass that is exposed to
liquid refrigerant monitors
Select one:
,a. Vapour flow
b. Refrigerant levels
c. The presence of moisture in the refrigerant
d. Liquid flow Ans✓✓✓ c
A circulating pump, known as a cooling water pump, is usually:
Select one:
a. A small capacity pump
b. A once-through device
c. A reciprocating pump
d. Connected with some type of heat exchanger system Ans✓✓✓ d
A collar thrust bearing:
Select one:
a. Has boundary lubrication
b. Is used with steam turbines only
c. Is an anti-friction type bearing
d. Can support more load than a Michell thrust bearing Ans✓✓✓ a
A common 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✓✓✓ c
A compression refrigeration system can be divided into two sections: a
high pressure section containing the head pressure and a low pressure
section carrying the _____ pressure:
Select one:
a. Suction
b. Saturation
c. Absolute
d. Discharge Ans✓✓✓ a
A diffuser pump:
Select one:
a. is more effective at changing velocity to pressure than a volute pump
b. Has high suction lift
c. Does not have a volute
d. Does not have to be primed Ans✓✓✓ a
questions wit verified answers
"Barking", as it occurs in a pulp mill, means:
Select one:
a. Cutting the logs into short lengths
b. The removal of bark from the logs
c. To wash the incoming logs
d. To chip the logs Ans✓✓✓ b
A _____ system uses a thermal fluid in place of steam or water, to
conduct heat from a central source to other vessels and heating coils in a
plant.
Select one:
a. Hot oil
b. Condensing
c. Closed
d. Low temperature heating Ans✓✓✓ a
A boiler feedwater isolation valve:
Select one:
a. May be a globe valve, provided water enters below the disc
,b. Should be located close to the feedwater pump
c. Must be a globe valve
d. Is used to isolate the deaerator Ans✓✓✓ a
A boiler furnace pre-purge:
Select one:
a. must last a specific amount of time.
b. happens only when the draft fans are at low speed.
c. can occur even if the boiler has a low water condition.
d. happens after the ignition transformer is energized. Ans✓✓✓ a
A boiler pressure explosion:
Select one:
a. Could result from a defective flame scanner
b. May be caused by a low water condition
c. Could be the result of inadequate ignition
d. Could be the result of water in the fuel oil Ans✓✓✓ b
A chemical dot placed under the lens of a sight glass that is exposed to
liquid refrigerant monitors
Select one:
,a. Vapour flow
b. Refrigerant levels
c. The presence of moisture in the refrigerant
d. Liquid flow Ans✓✓✓ c
A circulating pump, known as a cooling water pump, is usually:
Select one:
a. A small capacity pump
b. A once-through device
c. A reciprocating pump
d. Connected with some type of heat exchanger system Ans✓✓✓ d
A collar thrust bearing:
Select one:
a. Has boundary lubrication
b. Is used with steam turbines only
c. Is an anti-friction type bearing
d. Can support more load than a Michell thrust bearing Ans✓✓✓ a
A common 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✓✓✓ c
A compression refrigeration system can be divided into two sections: a
high pressure section containing the head pressure and a low pressure
section carrying the _____ pressure:
Select one:
a. Suction
b. Saturation
c. Absolute
d. Discharge Ans✓✓✓ a
A diffuser pump:
Select one:
a. is more effective at changing velocity to pressure than a volute pump
b. Has high suction lift
c. Does not have a volute
d. Does not have to be primed Ans✓✓✓ a
