ABSA: 4th Class Part B - Comprehensive Exam 2 Questions and Answers 100% Pass

ABSA: 4th Class Part B - Comprehensive Exam 2 Questions and Answers 100% Pass What must be located outside a Class T machinery room? Select one: a. Spare flashlights b. Disposable coveralls c. Machinery shut off switch d. Light switches - Answer- c Degradation of heat transfer fluid of a hot oil system will begin to occur if: Select one: a. The oil filter is not serviced regularly b. The oil temperature is above a specified range, for an extended period of time c. The oil is allowed to churn in the circulating pump d. The oil becomes too viscous - Answer- b Dry and flooded evaporators differ primarily in what respect? Select one: a. Dry evaporators use low-side floats, whereas flooded evaporators use high-side floats b. Flooded systems primarily use Group B1 and B2 refrigerants c. The heat transfer surfaces of a flooded evaporator are kept covered with liquid refrigerant d. The dry evaporator is designed to cool gases only - Answer- c It is good design practice to select a steam coil size so that: Select one: a. At least 10% of the coil capacity is needed when the air temperature at the coil inlet is €"5°C b. At least 80% of the coil capacity is needed when the air temperature at the coil inlet is €"1°C c. At least 40% of the coil capacity is needed when the air temperature entering the coil is €"1°C d. 100% of the coil capacity is needed when the air temperature entering the coil is €"1°C - Answer- c The final step when replacing a firetube is: Select one: a. Re-expansion b. Hydrostatic test c. Seal welding d. Annealing the tube ends - Answer- b If a boiler sustains a low water condition Select one: a. open the safety valve or drum vent valve to release pressure. b. use cool feedwater to quench any overheated heating surface. c. shut down the burner, let the boiler cool slowly, then drain and inspect it for damage due to overheating. d. immediately feed water into the boiler to raise the level. - Answer- c An advantage of a pump using a mechanical seal is: Select one: a. Ease of repair b. Less lubrication c. Less maintenance d. Lower first cost - Answer- c For economical operation, the steam supply to a steam engine is cut off once the piston has traveled _______ of its stroke. Select one: a. 1 b. 75% to 90% c. 1/2 to 5/8 d. 1/4 to 1/3 - Answer- d A high stack temperature in a hot oil heater may indicate: Select one