ABSA: 4th Class Part B - Comprehensive Exam 4 150 Multiple Choice, 4th Class Part B , Units 1

ABSA: 4th Class Part B - Comprehensive Exam 4 150 Multiple Choice, 4th Class Part B , Units 1 One of the legal responsibilities of the engineer during an inspection is: Select one: a. To notify the Workers Compensation Board of the inspection b. Point out any known or suspected defects to the inspector c. To have at least two staff members present at all times d. To be in possession of an inspection certificate b The _____ tubes of a fired hot oil heater have fins on their outer surfaces. Select one: a. Water b. Radiant c. Extended type d. Fire c The injection pump of a diesel engine is driven by: Select one: a. A camshaft b. The governor c. The gudgeon pin d. Piston action a Ammonia, as well as being toxic, is also: Select one: a. A low pressure refrigerant b. Flammable c. Miscible with oil d. Odourless b When a boiler primes, it means that: Select one: a. The steam vent is open, to allow it to fill b. Water is being carried over with the steam c. The boiler is being over fired d. The water has not been chemically treated b The slide valve of a steam engine is designed to: Select one: a. Allow steam to enter and leave the cylinder b. Prevent the engine from over-speeding c. Provide lubrication for the steam engine d. Drain the condensate from the cylinder during warm-up a A journal bearing: Select one: a. Supports a shaft b. require cooling water c. Does not require lubrication d. Controls thrust movement a Smaller spark ignition engine use ____________ to vapourize gasoline: Select one: a. Carburetion b. Atomization c. Electric heaters d. Vapourizers a Heat load from people in a room is mostly affected by: Select one: a. The building occupancy class b. The activity of the people c. The number of people d. The age of the people b Testing a safety valve on a boiler by pulling the try-lever Select one: a. Ensures the valve is free to operate b. Takes approximately two seconds c. Ensures the closing pressure is correct d. Ensures the popping pressure is correct a The ______________ is a type of unitary air conditioning system that uses a direct expansion refrigeration system to provide cooling and dehumidification, without using ductwork. Select one: a. Rooftop unit b. Window air conditioner c. Multi-zone system d. Unit ventilator b The property of oil that indicates its ability to support a load is: Select one: a. Viscosity b. Viscosity index c. Pour point d. Floc point a The inner walls and floor of a fired heater furnace are lined with: Select one: a. Ceramic tile b. Refractory c. Asbestos blocks d. Fiberglass insulation b A collar thrust bearing: Select one: a. Has boundary lubrication b. Is used with steam turbines only c. Is an anti-friction type bearing d. Can support more load than a Michell thrust bearing a With regard to hot oil leaving the heater, the operating parameter of particular importance is the oil: Select one: a. Viscosity b. Temperature c. Velocity d. Pressure b Buildings require heat sources to: Select one: a. Offset the building's heat losses b. Replace the exhaust air c. Replace the ventilation air d. Offset the heat gain from the atmosphere a Grooving and general thinning of the condensate return system is a result of: Select one: a. scale build-up b. high alkalinity c. oxygencorrosion d. carbonic acid corrosion d Freezing problems in steam coils with long tube lengths, when heating large amounts of low temperature outside air, can be minimized using Select one: a. An over-sized steam flow control valve. b. A controller that fully closes the outside air dampers when the outside air temperature drops to below freezing. c. Preheat coils controlled by an outdoor temperature controller. d. Modulating control valves to control the steam heating coil output. c The blow off valve in a storage heater is used to: Select one: a. Relieve excess pressure in the heater, during periods of low hot water demand. b. Remove sediment from the base of the heater c. Release steam should the heater malfunction, to keep steam from entering the plumbing fixtures d. Take potable water samples b With antifriction bearings using grease, the bearings: Select one: a. Never require cleaning b. Are cleaned less often than oil-lubricated bearings c. can be cleaned by adding solvent to the grease cartridge d. Must be cleaned twice as often as oil-lubricated bearings b Caustic embrittlement of boiler metal is promoted by: Select one: a. Concentration of sodium sulfite b. Overheating of boiler parts c. Concentration of sodium chloride d. Concentrations of sodium hydroxide d A _____ system uses a thermal fluid in place of steam or water, to conduct heat from a central source to other vessels and heating coils in a plant. Select one: a. Hot oil b. Condensing c. Closed d. Low temperature heating a For a wet layup, what is the recommended boiler water sodium sulfite residual?