ABSA 4A Exam Questions and Answers 2024 Correctly done

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 - Answer-a. 3000m above the sea level Efficiency of an electrostatic precipitator is: a. 75% b. 60% c. 90% d. 99.9% - 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 - 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 - Answer-c. Up to 5000 kW Wear on stem packing is mainly due to: a. Less tight packingb. Stem is under high temperature c. stem exposed to high corrosive material d. Rising and turning motion of the valve stem - 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 - 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 - 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 - Answer-c. fluid flows in a straight line through the valveIf 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 - 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 - 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 - 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 - Answer-d. darker shadows on the photographic paper When a wire is stretched its resistancea. Increases b. Decreases c. Decreases exponentially d. Doesn't change - Answer-a. Increases