1) In a single-cylinder 4-stroke engine, which strokes occur with both valves closed? a) Compression and intake strokes. b) Compression and exhaust strokes. c) Power and intake strokes. d) Compression and power strokes. 2) How many power strokes occur with 8 crankshaft revolutions in a single cylinder 2-stroke engine? a) 2. b) 4. c) 8. d) 16. 3) When the crankshaft of a 4-stroke engine is rotating at 2000 rpm, the camshaft speed is: a) 1000 rev/min. b) 2000 rev/min. c) 4000 rev/min. d) 8000 rev/min. 4) What is the name of the distance traveled by a piston from top dead center to bottom dead center? a) Capacity. b) Rotary motion. c) Connecting rod travel. d) Stroke. 5) How does inlet mixture enter the rotary engine working chamber? a) Through ports in the housing or side housing. b) Past inlet valves. c) Past reed valves. d) Through a port in the rotor. 6) In a 4-stroke engine, what is the speed and direction of a chain-driven camshaft compared to that of the crankshaft? a) Twice the speed of the crankshaft, in the same direction. b) Half the speed of the crankshaft, in the opposite direction. c) Half the speed of the crankshaft, in the same direction. d) Twice the speed of the crankshaft, in the opposite direction. 7) In a 2-stroke engine, when the piston moves up from bottom dead center, which port closes first? a) Inlet port. b) Transfer port to the cylinder. c) Opening to the reed valve. d) Exhaust port. 8) What causes combustion in a diesel engine? a) A glow plug. b) A spark plug. c) Heat of compression. d) Heat of the fuel. 9) In a 4-stroke diesel engine, what is in the charge that enters the inlet valve? a) Air only. b) Air and fuel. c) Air, fuel and oil. d) Fuel only. 10) In a 2-stroke diesel engine, what controls the flow of clean air into the cylinder? a) The camshaft and pushrod. b) The inlet valve. c) Movement of the piston over the inlet ports. d) The injector. 11) A diesel engine is also called a CI engine. What does CI stand for? a) Combustion Ignition. b) Combustion Induction. c) Compression Induction. d) Compression Ignition. 12) What is the basic operating principle of the internal combustion engine? a) Heat energy is changed to kinetic energy. b) Pressure increases as temperature decreases. c) A gas contracts when heated. d) A vacuum produces heating. 13) The sequence of strokes in a 4-stroke engine is: a) exhaust, power, intake, compression. b) intake, compression, power, exhaust. c) compression, inlet, power, exhaust. d) compression, inlet, exhaust, power. 14) Why do injectors in diesel engines use a number of fuel spray patterns? a) To achieve atomization. b) To cool the exhaust valves. c) To heat the highly compressed air charge. d) To cool the spark plug. 15) Why do many 2-stroke diesel engines use blowers? a) To cool the inlet ports. b) To assist with scavenging. c) To heat the exhaust valves. d) To provide clean air-fuel mixture for combustion. 16) When is fuel injected into the cylinder of a diesel engine? a) During the intake stroke. b) At the end of the power stroke. c) At the beginning of the compression stroke. d) Near the end of the compression stroke. 17) Diesel engines are usually more robust than spark-ignition engines, because they: a) use more fuel. b) operate at higher temperatures and pressures. c) run for longer periods of time. d) operate at lower temperatures. 18) How does the exhaust leave the rotary engine chamber? a) Past two exhaust valves in the housing. b) Through a port in the rotor center. c) Through an exhaust port in the rotor housing. d) Past an exhaust valve in the rotor. 19) How is a rotary engine normally cooled? a) Air is forced through hollows in the housing. b) Oil is circulated through galleries. c) Water is circulated through passages. d) Air is blown over the housing. 20) Which rotary engine components produce the eccentric motion of the rotor? a) Connecting rod and crankshaft. b) External and internal gears, and an eccentric shaft. c) Camshaft and cam followers. d) Camshaft and connecting rod. 21) In 1 rotation of the rotary engine rotor, how many power pulses does the rotor receive? a) 1. b) 2. c) 3. d) 6. 22) In a rotary engine, power is transferred to the flywheel: a) through the external and internal gears only. b) by the eccentric shaft. c) through the crankpin. d) by the camshaft. 23) How does a rotary engine achieve a seal between the rotor, the working chambers & the housing? a) It uses piston rings similar to a 4 stroke engine. b) The rotor actually touches the housing. c) Rotor speed makes sealing unnecessary. d) It uses sliding apex seals. 24) A gasoline or petrol engine can have: a) only one camshaft. b) a maximum of two camshafts. c) multiple camshafts. d) a minimum of one inlet and one exhaust camshafts. 25) To return the inlet and exhaust valves to their seats after opening by the cam, most four stroke engines use: a) pressure differential. b) gravity. c) springs. d) mechanical levers. 26) In a four-stroke engine which stroke occurs immediately before the power stroke? a) Combustion. b) Exhaust. c) Intake. d) Compression. 27) In a carbureted four stroke petrol engine, the air fuel mixture is transmitted to the engine by the: a) intake valves. b) exhaust manifold. c) intake manifold. d) transfer ports. 28) The terms ‘Bottom Dead Center’ and ‘Top Dead Center’ refer to the position of the: a) connecting rods. b) crankshaft. c) camshaft. d) pistons. 29) On a rotary engine, why is the inner surface of the rotor housing chrome-plated? a) For its shiny appearance. b) To make it more wear resistant. c) It’s cheaper to produce. d) It makes the engine quieter.

Engine Cycles (Recap)

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