ABSA 4B1 – Detailed Practice Questions with Verified Answers

ABSA 4B |1032 questions with verified answers
____ are chemicals injected into the boiler feedwater to change scale
forming salts into sludge.
1. Amines
2. Chelants
3. Litmus
4. Organics
5. Phosphates Ans✓✓✓ 5. Phosphates


____ are considered basic.
1. Alkali solutions
2. Acidic solutions
3. PH ranges of 0 to 7.0
4. PH of 7.0
5. Strong acids Ans✓✓✓ 1. Alkali solutions


____ are designed into large air ducts to increase the inherent stiffness.
1. Thermocouples
2. Flanges
3. Butt connections
4. Circular sections
5. Diagonal creases Ans✓✓✓ 5. Diagonal creases

,____ are installed in air cooled condensers, ventilation systems and unit
heaters.
1. Humidifiers
2. Rotary fans
3. Airfoil fans
4. Propeller axial flow fans
5. Sliding vane fans Ans✓✓✓ 4. Propeller axial flow fans


____ are installed in applications where the capability for the rotor to
reverse rotational direction is desired (example: ships).
1. Diesel engines
2. Heat engine
3. Reciprocating engines
4. Steam engines
5. Gasoline engines Ans✓✓✓ 4. Steam engines


____ are installed in applications where the capability for the rotor to
reverse rotational direction is desired (example: ships).
1. Reciprocating engines
2. Heat engine
3. Diesel engines
4. Gasoline engines
5. Steam engines Ans✓✓✓ 5. Steam engines

,____ are installed in steam heating systems to removed non-
condensables.
1. Air vents
2. Radiator valves
3. Radiator traps
4. Condensate receivers
5. Vacuum pumps Ans✓✓✓ 1. Air vents


____ are installed in steam heating systems to removed non-
condensables.
1. Condensate receivers
2. Radiator traps
3. Vacuum pumps
4. Radiator valves
5. Air vents Ans✓✓✓ 5. Air vents


____ are removed during the annual cleaning of a firetube boiler tubes.
1. Soot deposits
2. Scale deposits
3. Salt deposits
4. Silica deposits
5. Magnetite layers Ans✓✓✓ 1. Soot deposits

, ____ are small relief valves that do not relieve pressure, but are installed
in systems to warn of impending overpressurization.
1. Sentinel valves
2. Rupture discs
3. Safety relief valves
4. Fusible plugs
5. Turbine overspeed trips Ans✓✓✓ 1. Sentinel valves


____ are the two methods used to lay up a boiler.
1. Cold and hot storage
2. Idle and active storage
3. Long and short storage
4. Dry and wet storage
5. Annual and semi-annual storage Ans✓✓✓ 4. Dry and wet storage


____ boiler safety valve is required to be installed on a higher pressure
boiler if the boiler's heating surface is not greater than 47 m2.
1. Two
2. Five
3. One
4. Three
5. Four Ans✓✓✓ 3. One