ABSA 4A UPDATED ACTUAL Questions and CORRECT Answers

ABSA 4A UPDATED ACTUAL Questions
and CORRECT 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


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
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

,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
c. 101.31

d. 102.16 - CORRECT ANSWER - d. 102.16


When using radiographic inspections, defects such as cracks and porosity show up as:
a. lighter shadows on the photographic paper


b. wave signals on a small screen


c. darker shadows on the penetrometer

, d. darker shadows on the photographic paper - CORRECT ANSWER - d. darker shadows
on the photographic paper


When a wire is stretched its resistance


a. Increases
b. Decreases
c. Decreases exponentially

d. Doesn't change - CORRECT ANSWER - a. Increases


A groove melted into the parent metal at the toe of the weld and left unfilled by the weld metals
is called:


a. inclusion
b. slag
c. cluster

d. undercut - CORRECT ANSWER - d. undercut


When an ultraviolet light is used in welding inspections, the testing method is:
a. destructive
b. ultrasonic
c. fluorescent penetrant

d. radiographic - CORRECT ANSWER - c. fluorescent penetrant


The entire weld joint including the re-hot parent metal adjacent to the weld joint is called:
a. the stress relief area
b. the heat affected zone