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  • 問題数 50 • 11/2/2023

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    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