4B ABSA QUESTIONS with correct
|\ |\ |\ |\ |\
answers
Four cycle compression ignition engine, the fuel enters the
|\ |\ |\ |\ |\ |\ |\ |\ |\
cylinder during what stroke ? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔compression stroke |\
Condensing turbines will: - CORRECT ANSWERS ✔✔1 - condense
|\ |\ |\ |\ |\ |\ |\ |\ |\
the exhaust steam in a heat exchanger
|\ |\ |\ |\ |\ |\
2- will create a vacuum on the last rotating blades
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
3-will have more auxillar equipment than a back pressure turbine
|\ |\ |\ |\ |\ |\ |\ |\ |\
In an impulse turbine the steam: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔pressure is reduced in the nozzles |\ |\ |\ |\ |\
Diesel engine cylinder scavenging: - CORRECT ANSWERS ✔✔is
|\ |\ |\ |\ |\ |\ |\ |\
the removal of exhaust gases from the cylinder
|\ |\ |\ |\ |\ |\ |\
Diesel engines require a: - CORRECT ANSWERS ✔✔fuel injector
|\ |\ |\ |\ |\ |\ |\ |\
The purpose of a diffuser in a centrifugical pump is to: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔change the velocity of the liquid to
|\ |\ |\ |\ |\ |\ |\ |\ |\
pressure:
Reaction turbines: - CORRECT ANSWERS ✔✔have a pressure drop
|\ |\ |\ |\ |\ |\ |\ |\
through the stationary and moving blades
|\ |\ |\ |\ |\ |\
,The forced draft cooling tower is different from the induced draft
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
tower because: - CORRECT ANSWERS ✔✔the induced draft tower
|\ |\ |\ |\ |\ |\ |\ |\ |\
has a fan which draws air up through the tower and out the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
atmosphere
Which engine has the highest compression ratio? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔diesel engine |\ |\
The pump best suited to pump a heavy viscous liquid is a: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔rotary pump |\ |\ |\
Which of the following types of compressors is best for high
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
compression ratios and small compression volumes? - CORRECT |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔reciprocating compressor |\ |\
The motion of moving parts _________ by friction? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Resisted |\
Oil used in the lubrication and cooling of refrigeration
|\ |\ |\ |\ |\ |\ |\ |\ |\
compressors must: - CORRECT ANSWERS ✔✔be readily and easily |\ |\ |\ |\ |\ |\ |\ |\
separated from the refrigerant
|\ |\ |\ |\
The main disadvantage of a gas turbine over other prime movers
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
is: - CORRECT ANSWERS ✔✔low thermal efficiency
|\ |\ |\ |\ |\ |\ |\
, The device used for removing the heat of compression of the air
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
between consecutive stages of a multi-staged compressor is
|\ |\ |\ |\ |\ |\ |\ |\
called: - CORRECT ANSWERS ✔✔an intercooler
|\ |\ |\ |\ |\
When the height above sea level increases, the atmospheric
|\ |\ |\ |\ |\ |\ |\ |\ |\
pressure will: - CORRECT ANSWERS ✔✔decrease |\ |\ |\ |\ |\
The methods used to control the output of an air compressor are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
grouped into three categories: - CORRECT ANSWERS ✔✔start and
|\ |\ |\ |\ |\ |\ |\ |\
stop control, variable speed control, constant speed control
|\ |\ |\ |\ |\ |\ |\ |\
To protect the motor when starting, the compressor must be: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔unloaded |\ |\
A thrust bearing is used to: - CORRECT ANSWERS ✔✔prevent
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
axial movement of the shaft
|\ |\ |\ |\
The type of combustion fuel control frequently used on a small
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
package boiler is: - CORRECT ANSWERS ✔✔on and off control
|\ |\ |\ |\ |\ |\ |\ |\ |\
A fresh air supply duct allows a controlled amount of outside air
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the enter the system for ? - CORRECT ANSWERS ✔✔Ventilation
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
purposes
A valve that seals on the downstroke is: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔direct acting |\
|\ |\ |\ |\ |\
answers
Four cycle compression ignition engine, the fuel enters the
|\ |\ |\ |\ |\ |\ |\ |\ |\
cylinder during what stroke ? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔compression stroke |\
Condensing turbines will: - CORRECT ANSWERS ✔✔1 - condense
|\ |\ |\ |\ |\ |\ |\ |\ |\
the exhaust steam in a heat exchanger
|\ |\ |\ |\ |\ |\
2- will create a vacuum on the last rotating blades
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
3-will have more auxillar equipment than a back pressure turbine
|\ |\ |\ |\ |\ |\ |\ |\ |\
In an impulse turbine the steam: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔pressure is reduced in the nozzles |\ |\ |\ |\ |\
Diesel engine cylinder scavenging: - CORRECT ANSWERS ✔✔is
|\ |\ |\ |\ |\ |\ |\ |\
the removal of exhaust gases from the cylinder
|\ |\ |\ |\ |\ |\ |\
Diesel engines require a: - CORRECT ANSWERS ✔✔fuel injector
|\ |\ |\ |\ |\ |\ |\ |\
The purpose of a diffuser in a centrifugical pump is to: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔change the velocity of the liquid to
|\ |\ |\ |\ |\ |\ |\ |\ |\
pressure:
Reaction turbines: - CORRECT ANSWERS ✔✔have a pressure drop
|\ |\ |\ |\ |\ |\ |\ |\
through the stationary and moving blades
|\ |\ |\ |\ |\ |\
,The forced draft cooling tower is different from the induced draft
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
tower because: - CORRECT ANSWERS ✔✔the induced draft tower
|\ |\ |\ |\ |\ |\ |\ |\ |\
has a fan which draws air up through the tower and out the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
atmosphere
Which engine has the highest compression ratio? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔diesel engine |\ |\
The pump best suited to pump a heavy viscous liquid is a: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔rotary pump |\ |\ |\
Which of the following types of compressors is best for high
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
compression ratios and small compression volumes? - CORRECT |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔reciprocating compressor |\ |\
The motion of moving parts _________ by friction? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Resisted |\
Oil used in the lubrication and cooling of refrigeration
|\ |\ |\ |\ |\ |\ |\ |\ |\
compressors must: - CORRECT ANSWERS ✔✔be readily and easily |\ |\ |\ |\ |\ |\ |\ |\
separated from the refrigerant
|\ |\ |\ |\
The main disadvantage of a gas turbine over other prime movers
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
is: - CORRECT ANSWERS ✔✔low thermal efficiency
|\ |\ |\ |\ |\ |\ |\
, The device used for removing the heat of compression of the air
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
between consecutive stages of a multi-staged compressor is
|\ |\ |\ |\ |\ |\ |\ |\
called: - CORRECT ANSWERS ✔✔an intercooler
|\ |\ |\ |\ |\
When the height above sea level increases, the atmospheric
|\ |\ |\ |\ |\ |\ |\ |\ |\
pressure will: - CORRECT ANSWERS ✔✔decrease |\ |\ |\ |\ |\
The methods used to control the output of an air compressor are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
grouped into three categories: - CORRECT ANSWERS ✔✔start and
|\ |\ |\ |\ |\ |\ |\ |\
stop control, variable speed control, constant speed control
|\ |\ |\ |\ |\ |\ |\ |\
To protect the motor when starting, the compressor must be: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔unloaded |\ |\
A thrust bearing is used to: - CORRECT ANSWERS ✔✔prevent
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
axial movement of the shaft
|\ |\ |\ |\
The type of combustion fuel control frequently used on a small
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
package boiler is: - CORRECT ANSWERS ✔✔on and off control
|\ |\ |\ |\ |\ |\ |\ |\ |\
A fresh air supply duct allows a controlled amount of outside air
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the enter the system for ? - CORRECT ANSWERS ✔✔Ventilation
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
purposes
A valve that seals on the downstroke is: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔direct acting |\
