This set of Energy Engineering online test focuses on “Engine Starting Methods – 2”.
1. What is a relay?
a) A device that resists the flow of Current
b) A device that resists the flow of direction in two ways
c) Device that allows small electrical current to control large electrical current
d) A device that allows the operator to control the current flow in the required direction
Explanation: A relay is a device that allows a small amount of electrical current to control a large amount of current. An automobile starter uses a large amount of current to start an engine. If we allow much current to go through the ignition switch, we would need a very large switch.
2. Years ago diesel engines were started with small engines called ________
a) mini engines
b) runty engines
c) pup engines
d) puny engines
Explanation: Years ago diesel engines were started with the small engines called pup engines. And another way used to start a diesel engine was by gasoline and switch it over to diesel fuel. A 12v electrical system became very popular and later on they were used.
3. How is minimum cranking speed achieved?
a) By providing the hp
b) By providing speed
c) By providing torque
d) By proving sufficient amount of fuel
Explanation: Minimum cranking speed is achieved by providing the necessary torque, which is actually a purpose of starter motor. As the starter motor rotates the flywheel, the crankshaft is turned, which then starts piston movement.
4. Engine cranking is difficult in which temperatures?
Explanation: The engine cranking is difficult in colder temperatures especially if engine is directly driving other machine equipments such as torque converter or hydraulic pumps. Cold engine oil adds to the load on starter, and this load may increase by 3 to 4 times what it would normally be in warmer weather.
5. Which is the recent difficulty added to the starting systems?
a) Fuel flow
b) Gear transmissions
c) Electronic controls
d) Fuel consumption
Explanation: The recent difficulty added to the stating system is electronic controls in engines. Some electronic control machines may need some minimum number of revolutions at a minimum speed before energizing the fuel system.
6. If the starter is used properly, for how many starts will it last?
a) About 8000
b) Over 10000
c) Upto 40000
d) At least 25000
Explanation: If the starter is used properly, it will last for over 10000 starts. The biggest factor affecting the life of a electric starter is overheating and over-cranking. Never run the starter switch for more than 30 seconds continuously.
7. What is CRDi?
a) Common rail direct infusion
b) Common rail direct injection
c) Common rail diesel injection
d) Common rail diesel infusion
Explanation: CRDi id common rail direct injection, which says direct injection of fuel into cylinders via a common single rail called single line which is connected to all the fuel injectors. This system is commonly equipped in diesel engines.
8. What is CDI?
a) Common diesel injection
b) Common direct injection
c) Capacitor discharge ignition
d) Capacitor direct ignition
Explanation: CDI stands for capacitor discharge ignition or thyristor ignition is a type of automotive electronic ignition system which is widely used in the outboard motors, motorcycles, chainsaws, lawn mowers and some cars.
9. What does TDI stand for?
a) Turbocharged diesel injection
b) Turbocharged direct injection
c) Turbocharged discharged infusion
d) Turbocharged Direction ignition
Explanation: TDI stands for Turbocharged direct injection is a design of turbo diesel engines. These are used in vehicles, also used in the marine engines. In this fuel injector sprays atomized fuel into main combustion chamber of each cylinder.
10. What is GDI engine?
a) Gasoline direct injection
b) Gasoline diesel injection
c) Gasoline discharge injection
d) Gasoline direct infusion
Explanation: In non-diesel IC engines, GDI (Gasoline direct injection), also known as petrol direct injection, Fuel satisfied ignition etc. Emission levels can be easily and accurately controlled with diesel systems.
Sanfoundry Global Education & Learning Series – Energy Engineering.
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