問題一覧
1
A hole is drilled between the crankshaft main journal and crank pin for :
Lubricating connecting rod bearings
2
Which of the following is attached to the piston to ensure good seal between the piston and the cylinder-
Piston ring
3
What type of bearing is fitted in the connecting rod big end ?
Shell bearing
4
The topmost ring in the piston ring is called -
Compression ring
5
Which mixed metal is present in the alloy of aluminium piston?
All of the above
6
Which type of piston from the following are used in two stroke engine ________?
Dome type
7
Piston tolerates high temperature and pressure. Mostly it is made of the following -
Aluminium alloy
8
What is connected to piston through the piston pin -
Connecting rod
9
What material is the piston made of -
Both
10
What is the correct composition of aluminium alloy for piston -
Aluminium = 91%, Tin = 2%, Copper = 7%
11
What connects the piston with the crankpin?
Connecting rod
12
Which one of the following is made of aluminum alloy ?
Piston
13
The diameter of the piston is ________ to the diameter of the cylinder.
Less
14
What is the name of the part marked 'X' in the figure given below-
Piston
15
Which of the following is not associated with piston -
Crankshaft
16
The purpose of piston rings is to control:
All of the above
17
Piston heads are dome shaped -
To help proper mixing of air fuel mixture
18
Generally the metal of piston rings is :
Cast iron
19
The piston pins in modern automobile engines are usually:
Fully-floating
20
The purpose of a piston pin that -
It connect the piston to the connecting rod
21
What is the type of piston head shown in the figure given below?
Irregular head
22
What is the piston clearance?
Clearance between cylinder and piston
23
The topmost ring in the piston ring is called -
Compression ring
24
What transfers energy from piston to crankshaft?
Connecting rod
25
Which of the following is not a part of a piston?
Gudgeon pin
26
What is the value of piston clearance for aluminum alloy-
0.025 to 0.1 mm
27
What is the type of piston head shown in the figure given below-
Concave head
28
Which statement is true about piston slap -
Piston slap gradually reduces as the engine warms up
29
Which is the crankshaft in opposite piston engine -
D. Both A and B
30
The volume of gas sucked between from TDC to BDC in piston is called -
Swept volume
31
What will happen if there is no proper clearance between the piston and the cylinder-
All of these
32
Which of the following is called Gudgeon pin?
Piston pin
33
Which is suitable for piston displacement -
π/4 × D² × L
34
The extreme point up to which the piston moves down inside the cylinder in its stroke is called -
B.D.C.
35
What is the name of the part marked 'X' in the figure given below-
Gudgeon pin boss
36
Which part of the piston is under high pressure and temperature?
Crown
37
Identify the type of floating gudgeon pin attached to the circle -
Full floating
38
The connecting rod is made of-
Alloy steel
39
In an opposed piston engine, the gas acts against the pistons during the combustion stage -
equal, opposite direction
40
There is some gap between the two ends of the piston ring, it is called piston ring gap, then what is the width of this gap ?
0.178 to 0.55 mm
41
The purpose of the gudgeon pin is to:
Connect the piston to the connecting rod
42
In full floating piston pin :
Piston pin is free in Piston bore and small end of connecting rod
43
Which of the following is not the function of a piston?
Generating energy by burning fuel
44
What is the value of piston clearance for cast iron?
0.018 mm
45
The maximum high point of movement of the piston of the cylinder is called -
TDC
46
The distance travelled by piston from upside to downside or vice versa is called ____ ?
Stroke
47
Which of the following piston rings is suitable for good oil scrap -
Inside bevel ring
48
If 'D' is the diameter of a piston, the length of skirt is usually of the range of __________
0.75D to 0.8D
49
What joins piston and connecting rod?
Gudgeon pin
50
What is the identity of oil ring groove ?
Holes are made in it
51
Due to high heat expansion of the material of the piston-
All of the above are correct
52
The return movement of the piston of the braking system in a single acting cylinder depends on _________.
External force or spring force
53
What material piston pins are made of?
Nickel chromium steel
54
Why is the piston skirt made hollow -
To reduce the weight of the piston
55
Gudgeon pins are made of-
Same material as that of piston
56
Gudgeon pin is used in -
In connecting the piston and connecting rod
57
Which of the following parts of piston act as bearing for connecting rod side thrust ?
Piston skirt
58
What is that point called from which piston cannot go more downward in cylinder ______?
B.D.C.
59
Connecting rod is attached to the piston by the-
Piston pin
60
The temperature of the piston will be more at which part of an automobile engine-
The crown of the piston
61
What is the name of the part marked 'X' in the figure given below-
Ring lands
62
When no. 1 piston of a four cylinder in line four stroke engine is performing the power stroke, no. 4 piston is on the stroke called -
Suction
63
Which packing is used in steam piston?
Cast iron
64
Which material is used to make the connecting rod -
Forged steel
65
Why does the cylinder remain less hot than the piston -
It is in direct contact with the coolant
66
The maximum up and maximum down position of the piston in the engine is called -
TDC and BDC
67
Piston rings are generally made of:
Cast iron
68
What type of piston is shown in the figure given below-
Split skirt piston
69
What is the function of heat dam in piston -
Keeping the piston cool
70
Through which part is the piston and the crankshaft connected-
Connecting rod
71
Which metal is present in the alloy of cast steel piston?
Copper
72
Which statement is not true for piston and connecting rod -
The piston moves linearly while the connecting rod moves circularly
73
What is the hole in the piston for the Gudgeon pin called -
Piston pin boss
74
Which part of the piston is subjected to high pressure and temperature?
Crown
75
When piston goes up then compression of gases is called ________?
Compression stroke
76
What is the name of the part marked 'X' in the figure given below-
Big end
77
Oil rings are used to scrap excess oil from the bore. The oil ring gap (picture) is :
0.3 mm to 0.9 mm
78
What is the name of most downward part of the piston -
Piston skirt
79
Which is the key element in converting reciprocating motion into rotary motion?
Connecting rod
80
What is the function of gudgeon pin?
Connect piston to connecting rod
81
Slots are cut on the piston -
To lighten the piston and prevent the lower skirt from overheating
82
Two types of rings are fitted on the piston -
Compression ring and oil ring
83
The minimum number of compression rings in an automotive engine is -
Two
84
What is the name of the part marked 'X' in the figure given below-
Gudgeon pin
85
In which type of combustion chamber is concave head piston used -
Solid injection
86
Which quality should not be there in a piston?
Must be heavy in weight
87
What is the type of piston head shown in the figure given below-
Domed head
88
A connecting rod connects the crankshaft and the:
Piston
89
The ring at the bottom of the piston is known by the following names -
Oil Ring
90
What is the space between two ring grooves called -
Ring Land
91
The part of piston below piston boss is called -
Skirt of the piston
92
What is the relationship between the diameter of the piston and the bore of the cylinder-
The diameter of the piston is less than the cylinder bore
93
What is the main reason for the problem of Piston slap -
Increase in piston clearance
94
On what factors does piston clearance depend ?
On both the bore and piston of the cylinder and the material of the cylinder
95
Piston compression rings are made of -
Cast iron
96
The volume of space left or remaining above the piston after piston reaching TDC called -
Clearance volume
97
Whose heat expansion is comparatively greater in piston and cylinder-
Piston
98
Which of the following are added to the piston to ensure good seal between piston and cylinder?
Piston rings
99
The extreme point up to which the piston moves up inside the cylinder in its stroke is called -
T.D.C.
100
Engine pistons are generally made of aluminum alloy because-
It is lighter