Internal Combustion Engines Test
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ScribdTranslationsInternal Combustion Engines Test
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ScribdTranslationsInternal combustion engine testing(the correct answers are at the end)
1. What is referred to as Otto engine:
a) To gasoline engines
b) To Diesel engines
c) Both.
They can reach 5500 rpm and their unit displacement ranges between 400 and 600 cm3, what about
What type of engines are we referring to?
a) Gasoline engines
b) Diesel Engines
c) High-speed Diesel engines
3. An engine whose cylinders have a greater diameter than the stroke is called:
square engines
b) Super square engines
c) Elongated engines
4. How many turns does the crankshaft of a 4-stroke engine make to complete one cycle?
work (admission, compression, expansion, and exhaust).
4 laps
b) 2 laps
1 lap
5. What is the distance between the PMS and PMI called?
caliber
b) Engine displacement
c) Race
6. La relación de compresión compara el volumen de la cámara de combustión con:
a) The unit volume
b) The total displacement
c) The volume of the cylinder plus the volume of the combustion chamber
7. How is it possible to increase the available time for gas exchange?
in highly revved engines?
a) Increased the AEE
b) Increased the valve overlap angle
c) Increased ignition
8. How do pressure and volume behave within the cylinder over time?
expansion?
a) Volume and pressure increase
b) The volume increases and the pressure decreases
c) The volume decreases and the pressure increases
In the Diesel engine, a high temperature and a strong turbulence of the compressed air:
a) They improve the mixing formation
They worsen performance
c) They generate the risk of self-ignition
10. The injection pressures used in direct injection Diesel engines:
They are lower than in the indirect injection.
They are higher than in indirect injection.
They are approximately the same.
11. The filling of air in the cylinder of a Diesel engine:
It should be the maximum possible
It is regulated by the gas butterfly
c) It depends on the engine load
12. In a Diesel engine when the fuel is injected:
a) It becomes inflamed at the end of the injection
It inflames when the spark jumps.
It inflames with a certain delay.
13. What consequence can the ignition delay have in a Diesel engine?
a) Slow and progressive combustion
b) Incomplete combustion
c) Accumulation of fuel followed by a sudden rise in pressure
14. What temperature should be reached during the compression stroke inside the cylinder?
of a diesel engine to ignite the injected fuel?
from 100 to 150 ºC
b) From 250 to 300 ºC
c) Above 500 ºC
15. Why is it necessary to cool the intake air in engines?
overfed?
a) Why does hot air take up more volume?
b) Why does hot air weigh more
c) Why does the fresh air mix better with the fuel?
16. What is the name of the parameter that is the product of the force applied on the piston and the
length of the crankshaft elbow?
a) Power
b) Performance
c) By motor
17. What data is always expressed along with the torque and power of an engine?
a) The compression ratio
b) The engine speed or rpm
c) The mean effective pressure
18. In which unit of the international system is the engine power expressed?
a) CV
b) Hp
c) KW
19. In a 6-cylinder engine, at what interval do the ignitions occur?
180º
b) 120°
c) 240º
20. Which side do they start numbering the engine cylinders?
a) On the side opposite to the flywheel
b) On the power output side of the motor
c) On the side opposite to the distribution
21. How many supports does a crankshaft have in a 4-cylinder inline engine?
a) 3
b) 4
c) 5
22. In a 4-stroke engine with 2 cylinders, how many strokes are produced in a
crankshaft rotation?
a) 1
b) 2
c) 4
23. In a 4-cylinder inline engine when cylinder number 1 goes down in stroke of
expansion What is the weather like in cylinder number 4?
a) Admission
b) Compression
c) Escape
24. To achieve an engine with shorter dimensions, its architecture must be
a) In 'V'
b) Online
25. The effective efficiency of an engine is higher in an engine:
a) Diesel
b) Otto
c) Equal
26. What metals currently make up the material for the manufacturing of gunstocks?
a) Of aluminum alloy
b) Made of cast iron
27. Which combustion chamber shape is the most similar to the ideal one?
bathtub camera
wedge camera
c) Hemispherical camera
28. The compression ratios used in Diesel with auxiliary combustion chamber:
They are taller than those of direct injection
They are lower than those of direct injection.
They are the same
29. What type of combustion chamber do injection Diesel engines usually use?
direct
a) Bathtub chamber over the piston head
b) Toric chamber on the piston head
c) Pre-combustion chamber
30. Inside the auxiliary combustion chambers are:
a) The pre-combustion chamber
b) The turbulence chamber
c) Both
31. The valve guides:
from soldiers to the buttstock
They are mounted with interference on the cylinder head.
They are mounted loosely on the cylinder head.
32. How to check the strength of the valve springs:
a) Its diameter and free height are measured
b) The force required to compress it to the maximum is measured.
c) Its deformation is measured under a certain load.
33. Before assembling the cylinder head, in OHC engines, the marks must be aligned.
distribution draft, why?
a) Because it is easier to move the crankshaft
b) To avoid damaging the belt during assembly
c) To prevent the pistons from colliding with the valves
34. Why is it that in some cases the screws cannot be reused?
buttstock?
a) Because traction decreases its length and increases its diameter
b) Because traction increases its length and decreases its diameter
c) Because the thread of the screws deteriorates
35. What tightening methods can be applied to the cylinder head?
a) In spiral or in cross
b) Cold or hot
c) Dynamometric or angular
36. What does a manometer measure?
a) The deflection of the timing belt under a known load
b) The load to which the tensor is subjected
c) The force needed to bend the belt at a 90º angle
37. What tolerance is allowed in the regulation of the timing belt tension?
5%
b) 10%
c) 20%
38. In case of incorrect timing alignment:
The heights vary but the total opening angle remains.
b) The total opening angle varies and the dimensions are maintained.
c) Vary the opening angle and the levels
39. If both valves of a cylinder are closed, and we turn the crankshaft in a direction
Correct, which one of them will open first?
a) It depends on the type of distribution
b) The intake valve
c) The escape valve
40. In what timing does valve overlap occur?
a) After the compression
b) After the expansion
c) At the end of exhaust and the beginning of intake
41. To adjust the tappets using the "cross" valve system:
a) The valves of cylinder no. 3 are regulated when those of no. 1 are crossed.
b) The valves of cylinder number 4 are crossed and their valves are adjusted.
The valves of cylinder no. 1 are crossed and those of no. 4 are adjusted.
42. What type of engine block is used for cylinders machined directly from the material itself?
block?
a) In the block with dry shirts
b) In the block with wet shirts
c) In the integral block
43. How many segments do the pistons usually have?
a) 2
b) 3
c) 4
44. Is the lubrication segment at the top of the piston?
a) True
b) False
45. What is the name of the connection system between the connecting rod and piston that incorporates a
bushing in the connecting rod and safety elastic rings?
Floating bolt
b) Fixed bolt to the connecting rod
c) Semi-floating bolt
46. Is the connecting rod 'foot' attached to the piston or to the crankshaft?
piston
b) Crankshaft
c) Neither of the two
47. What conditions are necessary to measure compression pressure?
a) Hot engine and closed throttle
b) Hot engine and throttle fully open
c) Cold engine and open throttle
48. Where do compression leaks occur most frequently?
a) Through the valve, the piston, and the crankcase
b) For the segments, connecting rod and piston
c) For the segments, the valves, and the cylinder head gasket
49. To measure the wear of the cylinders, the following is used:
a caliper or vernier
b) An interior gauge
c) A micrometer and a goniometer
50. When there is low compression in two adjacent cylinders it means:
Escape through the segments
b) Escape through the valves
c) Leak through the cylinder head gasket
Correct answers:
1-a 11-a 21-c 31-b 41-c
2-c 12-c 22-a 32-c 42-c
3-b 13-c 23-a 33-c 43-b
4-b 14-c 24-a 34-b 44-b
5-c 15-a 25-a 35-c 45-a
6-c 16-c 26-a 36-a 46-a
7-b 17-b 27-c 37-b 47-b
8-b 18-c 28-a 38-a 48-c
9-a 19-b 29-b 39-c 49-c
10-b 20-a 30-c 40-c 50-c