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ITI Diesel Mechanic Questions and Answers pdf

ITI Diesel Mechanic Theory Question Answer

Part – 2

ITI Diesel Mechanic Questions and Answers pdf

1- Which of the following is not a common type of diesel engine injection system?
a) Mechanical
b) Electronic
c) Common rail
d) Carbureted
Answer: d) Carbureted

2- What is the purpose of the fuel injector in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To atomize and inject fuel into the engine’s cylinders at the proper time and pressure
d) To increase fuel efficiency
Answer: c) To atomize and inject fuel into the engine’s cylinders at the proper time and pressure

3- What is the function of the glow plugs in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To heat the combustion chamber to facilitate starting
d) To increase fuel efficiency
Answer: c) To heat the combustion chamber to facilitate starting

4- What is the purpose of the camshaft in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To open and close the engine’s valves at the proper time
d) To increase fuel efficiency
Answer: c) To open and close the engine’s valves at the proper time

5- What is the function of the piston rings in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To seal the gap between the piston and the cylinder wall, preventing compression loss and oil leakage
d) To increase fuel efficiency
Answer: c) To seal the gap between the piston and the cylinder wall, preventing compression loss and oil leakage

6- What is the purpose of the turbocharger in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To compress the air before it enters the engine’s cylinders, increasing power and efficiency
d) To increase fuel efficiency
Answer: c) To compress the air before it enters the engine’s cylinders, increasing power and efficiency

7- What is the function of the oil pump in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To circulate engine oil through the engine, lubricating moving parts and reducing friction
d) To increase fuel efficiency
Answer: c) To circulate engine oil through the engine, lubricating moving parts and reducing friction

ITI Diesel Mechanic Questions and Answers pdf

8- What is the purpose of the timing belt or chain in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To synchronize the rotation of the camshaft and crankshaft, controlling valve timing and engine timing
d) To increase fuel efficiency
Answer: c) To synchronize the rotation of the camshaft and crankshaft, controlling valve timing and engine timing

9- What is the function of the crankshaft in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To convert linear motion (piston movement) into rotational motion, turning the engine’s flywheel and generating power
d) To increase fuel efficiency
Answer: c) To convert linear motion (piston movement) into rotational motion, turning the engine’s flywheel and generating power

10- What is the purpose of the flywheel in a diesel engine?
a) To regulate the amount of fuel entering the
b) To cool the engine
c) To store energy from the engine’s power stroke and deliver it to the transmission during the next cycle
d) To increase fuel efficiency
Answer: c) To store energy from the engine’s power stroke and deliver it to the transmission during the next cycle

11- What is the function of the alternator in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To generate electricity to recharge the battery and power the vehicle’s electrical systems
d) To increase fuel efficiency
Answer: c) To generate electricity to recharge the battery and power the vehicle’s electrical systems

12- What is the purpose of the engine oil filter in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To remove contaminants and impurities from the engine oil, protecting the engine’s internal components
d) To increase fuel efficiency
Answer: c) To remove contaminants and impurities from the engine oil, protecting the engine’s internal components

13- What is the function of the engine air filter in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To remove dirt, dust, and other debris from the air entering the engine, preventing damage and increasing efficiency
d) To increase fuel efficiency
Answer: c) To remove dirt, dust, and other debris from the air entering the engine, preventing damage and increasing efficiency

14- What is the purpose of the engine coolant in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To lubricate moving parts within the engine
d) To increase fuel efficiency
Answer: b) To cool the engine

15- What is the function of the exhaust system in a diesel engine?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To remove harmful gases and particulate matter from the engine’s exhaust before releasing it into the atmosphere
d) To increase fuel efficiency
Answer: c) To remove harmful gases and particulate matter from the engine’s exhaust before releasing it into the atmosphere

16- What is the purpose of the engine’s EGR system?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To reduce the amount of nitrogen oxides (NOx) produced by the engine
d) To increase fuel efficiency
Answer: c) To reduce the amount of nitrogen oxides (NOx) produced by the engine

17- Which of the following is not a component of the engine’s cooling system?
a) Radiator
b) Water pump
c) Thermostat
d) Brake caliper
Answer: d) Brake caliper

18- What is the purpose of the engine’s thermostat?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To regulate the engine’s operating temperature by controlling the flow of coolant through the engine
d) To increase fuel efficiency
Answer: c) To regulate the engine’s operating temperature by controlling the flow of coolant through the engine

19- What is the function of the engine’s serpentine belt?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To transfer power from the engine to the vehicle’s accessories (alternator, water pump, power steering pump, etc.)
d) To increase fuel efficiency
Answer: c) To transfer power from the engine to the vehicle’s accessories (alternator, water pump, power steering pump, etc.)

20- What is the purpose of the engine’s glow plugs?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To preheat the combustion chamber in cold temperatures, aiding in the ignition of the fuel
d) To increase fuel efficiency
Answer: c) To preheat the combustion chamber in cold temperatures, aiding in the ignition of the fuel

21- Which of the following is not a component of the engine’s fuel system?
a) Fuel filter
b) Fuel injectors
c) Throttle body
d) Fuel tank cap
Answer: d) Fuel tank cap

22- What is the purpose of the engine’s fuel injectors ?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To deliver precise amounts of fuel directly into the combustion chamber for efficient combustion
d) To increase fuel efficiency
Answer: c) To deliver precise amounts of fuel directly into the combustion chamber for efficient combustion

23- What is the function of the engine’s turbocharger?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To increase the amount of air entering the engine, resulting in improved power and efficiency
d) To increase fuel efficiency
Answer: c) To increase the amount of air entering the engine, resulting in improved power and efficiency

24- What is the purpose of the engine’s intercooler?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To cool the air entering the engine, increasing its density and improving performance
d) To increase fuel efficiency
Answer: c) To cool the air entering the engine, increasing its density and improving performance

25- What is the function of the engine’s crankshaft?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To convert the reciprocating motion of the pistons into rotational motion, providing power to the vehicle
d) To increase fuel efficiency
Answer: c) To convert the reciprocating motion of the pistons into rotational motion, providing power to the vehicle

26- What is the purpose of the engine’s camshaft?
a) To regulate the amount of fuel entering the engine
b) To cool the engine
c) To open and close the engine’s valves at the correct time, allowing air and fuel to enter and exhaust gases to exit the engine
d) To increase fuel efficiency
Answer: c) To open and close the engine’s valves

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