1) Diesel engine governors control engine speed by varying the: a) fuel quantity injected. b) throttle position. c) injection sequence. d) injection timing. 2) Pintle-type diesel fuel injectors spray fuel: a) into the inlet manifold. b) into an open combustion chamber. c) into the pre-combustion chamber. d) onto the spark plug. 3) The breaking up of liquid petrol into fine droplets by spraying it is called: a) vaporization. b) atomization. c) ionization. d) venturi effect. 4) Intake manifold heating is designed to: a) assist fuel vaporization at low temperatures. b) prevent vapor locks. c) increase engine operating temperatures. d) assist fuel atomization at low temperatures. 5) Air velocity through the venturi of a carburetor is at a minimum: a) when the throttle is opened suddenly. b) at idle speed. c) at high speed. d) when the power jet is operating. 6) In a carburetor fuel system, the fuel level in the float chamber is controlled by: a) inlet and outlet valves. b) the amount of fuel returned to the tank. c) the fuel nozzle and venturi. d) the float and needle valve. 7) A balanced carburetor is one which has:  a) no float chamber vent. b) 2 venturis. c) the float chamber vented into the air horn. d) the float chamber vented externally. 8) A ‘lean’ mixture is one that has: a) a low air-fuel ratio. b) a high air-fuel ratio. c) a ratio below 15 to 1. d) a ratio of approximately 12 to 1. 9) The chemically correct air-fuel ratio, by mass, for complete petrol combustion is approximately: a) 9:1. b) 12:1. c) 15:1. d) 18:1. 10) Air flow through the venturi of a carburetor results in: a) reduced air speed and pressure. b) increased air speed and pressure. c) increased air speed and lower pressure. d) reduced air speed and higher pressure. 11) In a carburetor fuel system, suddenly depressing the accelerator causes extra fuel to be delivered: a) into the airstream above the venturi. b) into the main jet system. c) through the low speed ports. d) into the float chamber. 12) In a carburetor fuel system, fuel vapors above the fuel in the tank are normally vented: a) to the atmosphere. b) into the crankcase. c) to the fuel return line. d) into a charcoal canister. 13) In a carburetor fuel system, a power bypass valve is usually opened by: a) an increase in fuel pressure. b) an increase in manifold vacuum. c) a decrease in manifold vacuum. d) a mechanical link and duration spring. 14) In-line fuel injection pumps in a diesel fuel system: a) have one pumping element per cylinder. b) have one pumping element for all cylinders. c) are connected to a throttle butterfly by a cable linkage. d) have a vane pump to raise fuel injection pressure. 15) In a diesel fuel system, a leak-off rail returns excess fuel from the injectors to the: a) fuel injection pump. b) fuel tank. c) inlet manifold. d) engine crankcase. 16) In a carburetor fuel system, mixture correction at high speed is usually achieved by: a) using a smaller main jet. b) using an air bleed. c) opening the choke valve. d) adjusting the idle mixture screw. 17) Diesel engine speed is controlled by: a) the quantity of fuel injected into the engine. b) the quantity of air drawn into the engine. c) the ignition timing. d) adjusting camshaft timing. 18) In a carburetor fuel system, increasing the diaphragm spring force in a fuel pump would result in: a) increased delivery pressure. b) increased vaporization of the fuel. c) increased vacuum on the inlet side. d) a cooling of the fuel supply. 19) Diesel fuel injectors are operated by: a) air pressure. b) fuel pressure. c) an electrical solenoid. d) a spring and rocker assembly. 20) The ignition quality of diesel fuel is determined by:  a) cetane number. b) octane number. c) octane rating. d) compression rating. 21) A hand-priming pump is fitted to diesel engine fuel systems to: a) bleed air from the system. b) clear fuel blockages in the return line. c) check injector operation. d) prime the fuel for cold-starting. 22) In a diesel fuel system, glow plugs are located in the: a) exhaust manifold, to promote cleaner burning. b) intake manifold, to vaporize the air-fuel mixture. c) combustion chamber, to raise the air temperature. d) fuel filters, to vaporize the fuel. 23) By volume, how much air is needed to consume 1 liter of gasoline? a) 11 liters. b) 110 liters. c) 1,100 liters. d) 11,000 liters. 24) In a carburetor fuel system, the fuel pump outlet valve opens when the: a) diaphragm moves up. b) diaphragm moves down. c) carburetor float chamber is full. d) rocker arm moves towards the pump body. 25) One advantage of an electric fuel pump in a carburetor fuel system is that it: a) pumps at a higher pressure than a mechanical one. b) fills the carburetor before cranking of the engine for starting. c) requires less power to operate. d) cannot fill the carburetor too high to cause flooding. 26) In a carburetor fuel system, how is a submersible electric fuel pump lubricated? a) Cool air surrounding the pump. b) By the fuel. c) Oil sealed within the pump. d) No lubrication is required.

Fuel Systems Big Quiz (Recap)

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