ABSA 4A Exam Questions And Answers
Lowest boiling point of water is at?
a. 3000m above the sea level
b. Just below sea levelc.
at 1000m above sea level
d. at 101.3kPa -
correct answer ✅a. 3000m above the sea level
Efficiency of an electrostatic precipitator is:
a. 75%
b. 60%
c. 90%
d. 99.9% -
correct answer ✅d. 99%
Non-Return stop valves are important in which situations
a. when connected in parallel with other boilers
b. when boiler trips
c. if boiler ruptures
d. all of the above -
correct answer ✅d. all of the above
,ABSA 4A Exam Questions And Answers
4th class power engineer can take charge of Power Plant as a shift
Engineer:
a. Up to 500 kW
b. Up to 1000 kW
c. Up to 5000 kW
d. Up to 10000 kW -
correct answer ✅c. Up to 5000 kW
Wear on stem packing is mainly due to:
a. Less tight packing
b. Stem is under high temperature
c. stem exposed to high corrosive material
d. Rising and turning motion of the valve stem -
correct answer ✅d. Rising and turning motion of the valve stem
The following is true of a gate valve:
a. has less restriction in a line than a globe valve, is used to throttle
flow
b. has less restriction in a line than a globe valve, should be
operated fully open or fully closed
c. is used to throttle flow, is used for different applications than a
globe valve
,ABSA 4A Exam Questions And Answers
d. should be operated fully open or fully closed, has more
restriction in a line than a globe valve -
correct answer ✅b. has less restriction in a line than a globe valve,
should be operated fully open or fully closed
The flat disc of a butterfly valve rotates through __________ from
the wide open to the fully closed position:
a. 45 degrees
b. 60 degrees
c. 90 degrees
d. 180 degrees -
correct answer ✅c. 90 degrees
An advantage of the gate valve is that it has a low resistance to flow
when fully open. This is due to the fact that:
a. gate valves are larger than globe valves
b. fluid handled by gate valves is of higher viscosity than that
handled by globe valves
c. fluid flows in a straight line through the valve
, ABSA 4A Exam Questions And Answers
d. gate valves are used in horizontal installations only -
correct answer ✅c. fluid flows in a straight line through the valve
If the heating surface area of a boiler is 12 m , kW rating of the
boiler is:
a. 6 kW
b. 12 kW
c. 120 kW
d. 1200 kW -
correct answer ✅c. 120 kW
Two methods in common use that provide for expansion of pipe
lines are ___________ and expansion joints
a. expansion pipes
b. corrugation joints
c. bellows joints
d. expansion bends -
correct answer ✅d. expansion bends
.What are the inside dimensions of schedule 40 pipe of 114.3 OD:
a. 108.2
b. 120.32
Lowest boiling point of water is at?
a. 3000m above the sea level
b. Just below sea levelc.
at 1000m above sea level
d. at 101.3kPa -
correct answer ✅a. 3000m above the sea level
Efficiency of an electrostatic precipitator is:
a. 75%
b. 60%
c. 90%
d. 99.9% -
correct answer ✅d. 99%
Non-Return stop valves are important in which situations
a. when connected in parallel with other boilers
b. when boiler trips
c. if boiler ruptures
d. all of the above -
correct answer ✅d. all of the above
,ABSA 4A Exam Questions And Answers
4th class power engineer can take charge of Power Plant as a shift
Engineer:
a. Up to 500 kW
b. Up to 1000 kW
c. Up to 5000 kW
d. Up to 10000 kW -
correct answer ✅c. Up to 5000 kW
Wear on stem packing is mainly due to:
a. Less tight packing
b. Stem is under high temperature
c. stem exposed to high corrosive material
d. Rising and turning motion of the valve stem -
correct answer ✅d. Rising and turning motion of the valve stem
The following is true of a gate valve:
a. has less restriction in a line than a globe valve, is used to throttle
flow
b. has less restriction in a line than a globe valve, should be
operated fully open or fully closed
c. is used to throttle flow, is used for different applications than a
globe valve
,ABSA 4A Exam Questions And Answers
d. should be operated fully open or fully closed, has more
restriction in a line than a globe valve -
correct answer ✅b. has less restriction in a line than a globe valve,
should be operated fully open or fully closed
The flat disc of a butterfly valve rotates through __________ from
the wide open to the fully closed position:
a. 45 degrees
b. 60 degrees
c. 90 degrees
d. 180 degrees -
correct answer ✅c. 90 degrees
An advantage of the gate valve is that it has a low resistance to flow
when fully open. This is due to the fact that:
a. gate valves are larger than globe valves
b. fluid handled by gate valves is of higher viscosity than that
handled by globe valves
c. fluid flows in a straight line through the valve
, ABSA 4A Exam Questions And Answers
d. gate valves are used in horizontal installations only -
correct answer ✅c. fluid flows in a straight line through the valve
If the heating surface area of a boiler is 12 m , kW rating of the
boiler is:
a. 6 kW
b. 12 kW
c. 120 kW
d. 1200 kW -
correct answer ✅c. 120 kW
Two methods in common use that provide for expansion of pipe
lines are ___________ and expansion joints
a. expansion pipes
b. corrugation joints
c. bellows joints
d. expansion bends -
correct answer ✅d. expansion bends
.What are the inside dimensions of schedule 40 pipe of 114.3 OD:
a. 108.2
b. 120.32
