4th Class ABSA Exam Part A Practice Questions And Answers Verified 100% Correct

4th Class ABSA Exam Part A Practice Questions And
Answers Verified 100% Correct
3rd class power engineer can take charge of what HEATING PLANT
a) ALL
b) 1000kW
c) 15000kW
d) 10000kW - ANSWER -

5th class power engineer can work as shift engineer in a power plant rated at what
capacity
a) 500kW
b) 1000kW
c) 5000kW
d) 10000kw - ANSWER -

What is the enthalpy of 1kg of saturated water at 200kPa - ANSWER -

How do you tighten a flange - Cross sectional (star pattern) - ANSWER -

Superheater PRV discharge capacity
a) 50%
b) 65%
c) 75%
d) 85% - ANSWER -

Chemical composition of SO2

a) 1 Sulphur atom 2 oxygen atoms
b) 1 Sulphur molecule 2 oxygen molecules
c) 2 Sulphur atom 1 oxygen atoms
d) 1 Sulphur electron 2 oxygen electrons - ANSWER -

P&ID - ANSWER -Piping and Instrumentation Diagram , Uses a flow diagram to
represent process flows , Does not show monitoring devices

What does Lead Sulphide cell respond to
a) Flame temperature
b) Infrared rays - ANSWER -

, Thermowells are used for
a) Low pressure
b) High Pressure
c) Low Temperature
d) High Temperature - ANSWER -

Flashpoint - ANSWER -The lowest temperature at which a combustible material
will produce an ignitable vapor.

Lower Explosive Limit (LEL) - ANSWER -minimum concentration of vapour to
air below which a flame will not ignite in the presence of an ignition source "too
lean to burn"

Upper Explosive Limit (UEL) - ANSWER -Is the maximum vapour to air
concentration above, which a flame will not ignite. Also known as "too rich to
burn."

Proportional controller - ANSWER -Provides a proportional output based on the
error between process variable and setpoint

Vanstone flange is held in place by?

a) Loosely
b) Nuts
c) Threaded - ANSWER -Loosely

Who is responsible for providing workplace labels? - ANSWER -

Name of field rotation speed - Synchronous - ANSWER -

Advantages of having flat tube sheets? - ANSWER -

What are settling ponds used for?

a) Collidal fine particles
b) Floating Pollutants - ANSWER -

Definition of acceleration - ANSWER -The rate at which velocity changes

,Scalar definition - ANSWER -having only magnitude, not direction.

Vector definition - ANSWER -A quantity that has magnitude and direction

MSDS provider - ANSWER -

emergency plan - ANSWER -

thermo couple - ANSWER -a device that converts thermal energy into electrical
energy

Avogadro's number - ANSWER -number of representative particles in a mole,
6.02 X 10^23

A 8 m bar is pivoted at 5 m from the left end. A force of 15 N is applied
downwardly on the left end and a force of 20 N is applied downwardly on the right
end. What would be the clockwise and counter-clockwise moments and in which
direction would the bar rotate?

a. 60 Nm counter-clockwise, 75 Nm clockwise, counter-clockwise rotation
b. 60 Nm counter-clockwise, 75 Nm clockwise, clockwise rotation
c. 75 Nm counter-clockwise, 60 Nm clockwise, clockwise rotation
d. 75 Nm counter-clockwise, 60 Nm clockwise, counter-clockwise rotation
e. 60 Nm counter-clockwise, 60 Nm clockwise, equilibrium - ANSWER -d

Total Resistance in a circuit - ANSWER -

Compute for current in a circuit V=IR - ANSWER -

Voltage for Electrostatic Precipitators - ANSWER -

Whats flux on a welding rod for - ANSWER -

Whats air and steam used for in devices

a) Burner
b) Sootblower - ANSWER -

What is the Tensile strength for a welding rod E6010 - ANSWER -

, What are welded nozzles on a boiler called - ANSWER -

Flat stubs are one of the 3 types of ________? - ANSWER -

What are manholes used for? - ANSWER -

Cylinder volume diameter height given and cylinder is 35% full. Calculate weight
of water in cylinder - ANSWER -

Cooling tower used to reduce? - ANSWER -Thermal pollution

Calculate displacement from 3 vectors - ANSWER -

Instrumentation (NO/NC) question - ANSWER -

Steam tables x 5 Questions - ANSWER -

Tube Stub definition - ANSWER -

Which of these have to be replaced after use --- - ANSWER -Rupture Disk

Calculate the weight of a pipe (Schedule 40) 2meter SL-3" - ANSWER -

Why don't large clinkers form on a fluidized bed boiler - ANSWER -

When the magnetic field is rotating what type of speed is that - ANSWER -

Why is a tubesheet in a firetube boiler made flat - ANSWER -

Sensors send signals to - ANSWER -

Efficiency of Electrical boiler - ANSWER -

Where do we use stays on a firetube boiler
waterleg,
tubesheet,
crownsheet - ANSWER -

Solving for dryness factor - 3 questions - ANSWER -