問題一覧
1
A heavy rotating body which serves as a reservolt. absorbing and redistributing kinetic energy,
C. Flywheel
2
Which of the following is not the use of spring?
B. Measure the thickness
3
The ratio of mean diameter of coil over the coil diameter is known as
C. Spring index
4
The overall length of the spring when it is compressed until all adjacent coils touched.
D. Solid length
5
The length of coil spring under no load is know as
B. Free length
6
in general, steel springs are made of relatively high carbon steel usually
D. more than 0.5%
7
When heat-treated wire is coiled cold it should be stress relieved for bending stresses after cooling by being heated at some
B. 500°F
8
A low cost spring material, suitable where service is not severe and dimensional precision is not needed.
A. Hard drawn wire spring
9
A hard drawn also 80% reduction but it is made grade steel.
B. Music wire
10
À spring wire with good quality for impact loads moderately high temperature is known as
A. Chromium-silicon
11
A type of coil where the helical coil is wrapped into a circle forming an annular ring.
D. Garter spring
12
An elastic stored energy machine element that when released, will recover its basic form.
D. Spring
13
In laminated spring the strips are provided in different lengths for
A. economy
14
À type of spring made in the form of a dished washed
A. Belleville spring
15
A type of spring where thin flat strip wound up on itself 2s a plane spiral, usually anchored at the inside.
C. Motor spring
16
The majority of colls springs are made of coll tempered carbon steel wire containing carbon.
D. 0.60 to 0.70
17
The solld length plus the clearance plus the maximum deflection is called
B. Free length
18
when a apring ia made of duclile material the curvature factor would be
C. unity
19
The solld length of squared ends is
A. (n + 3 )d
20
The actual number of coil is in a square and ground ends.
B. n + 2
21
According to W.M. Griffith the critical frequency of the spring should behold at least times the frequency of application of a periodic load.
D. 20
22
Experimental results Indicate that the actual frequency of the spring is from
B. 10 to 15%
23
The free length of ground ends is
D. пр
24
The ratio of the mean diameter of the spring to the wire diameter is called
С. spring index
25
The relationship between the force exerted by a spring and its deflection is called
C. spring rate
26
The shortest length for the spring during norms operation is known as
C. Operating length
27
Refers to the space between adjacent coils when the spring is compressed to its operating length.
C. Coil clearance
28
The spring index of valve and clutch is
B. 5
29
The spring index for general industrial uses should be
D. 8 to 10
30
Refers to the axial distance from a point on one coll to the corresponding point on the next adjacent coll.
A. Pitch
31
The most practical spring designs produce a pitch angle is less than
A. 12°
32
The length of a coil spring times the effective number of coil is called
A. active length
33
Which of the following material to be used for leaf and coil springs?
D. AISI 4063
34
Engine valves get shut by means of
D. valve spring
35
Cross wire grooves are types which
A. absorb shocks because of road unevenness
36
Refers to a flat or curved made of thin superimposed plates and forming a cantilever or beam of uniform strength.
D. Laminated spring
37
For springs subjected to light service, the factor of safety of, _Is suggested.
A. 1.5
38
The_____of parallel connection of spring is always constant.
A. elongation
39
Typical hub length falls between
B. 1.25D to 2.4 D
40
The device for smoothing out the power impulses from the engine is known as
C. flywheel
41
Speedometer drive is generally taken from
C. front wheel
42
The kind of energy stored in the flywheel is
B. kinetic energy
43
Flywheel is also known as
A. Balance wheel
44
Attached to the rear end of the crankshaft is the
B. flywheel
45
The recommended coefficient of fluctuation of flywheels for punching, shearing, and pressing machine is
A. 0.05 to 0.10
46
A large rotary machine parts whose function is to store energy and to produce uniform angular velocity of the shaft of reciprocating engine is known as
C. Flywheel
47
In many flywheel designs about of the weight is concentrated in the hub and am. per cent
B. 30
48
The function of the flywheel is
D. all of the above
49
The function of a flywheel is to
B. complete the unuseful stroke
50
A massive wheel, which by its inertia assists in securing uniform motion of machinery by resisting sudden changes of speed.
C. Flywheel