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20 Spring term "Engineering Mechanics (II)" on-line job usually 3
Paper Total: 100 Score: 100
a, multiple choice (a total of 20 questions, a total of 100 points)
1. Iron cross-section along the specimen breaks during stretching, this () related.
Maximum shear stress A.
B. maximum tensile stress
C. maximum shear stress and the maximum tensile stress
D. Maximum tensile strain
2 a cross section along an axis of the lever shaft axial force is varied, the damage occurs in ().
A. certain maximum force, and the area of a certain minimum
B. axial force of a certain maximum and minimum area must
C. necessarily the maximum axial force, but the area of a certain minimum
constant than the maximum axial force and area of D.
3. When the result is a simplified plane General Force principal vector not equal to zero, not equal to zero when the primary moment, the result is synthetic.
A. force, by simplifying the center line of action
B. couple
C. force, the center line of action is not simplified by
D. balance
4. If the force line of axially longitudinal strain is negative rod, the transverse strain line ().
A. positive
B. negative
C. After calculated to determine
D. can not be determined
The high-temperature short-time () impact on the material.
Fatigue strength A.
B. hardness
C. creep
D. These three
6. The following () can function in a smaller lever flexibility.
A. Long reduced pressure club
stiffness increases supported B.
C. large inertia radius of the selected cross-sectional shape
D. more than three can be
7. Critical slender columns independent of the force ().
A. Lever material
length rod B.
C. the pressure rod
cross-sectional shape and size of rods D.
8. The plane-parallel force system using equilibrium conditions, up solved () unknowns.
A.1
B.2
C.3
D.4
9. The necessary and sufficient conditions Concurrent Force plane is two coordinates of the projection of each force shaft algebraic sum () is
A. A is greater than 0, less than 0 a
B .. We are equal to 0
C. less than 0
D. greater than 0
10. The theoretical stress concentration factor refers to () ratio.
A. Maximum local stress and mean stress
B. minimal local stress and mean stress
C. The average maximum stress and local stress
D. minimal local stress and mean stress
11. If the space of main stress point = Shear Stress = - minor principal stress, at the point ().
A. Pure stretched flat state
B. pure compression plane
C. plane shearing state
D. stressed state space
12. If a plane oriented force system to the point A simplified sagittal plane results, principal moment are zero, the results point to another within the plane B simplified ().
A. principal vector, principal moment are zero
B. principal vector is zero, non-zero principal moment
C. principal vector is not zero, the principal moment of zero
D. are possible
{FIG 13}
AA
BB
the CC
DD
14. The effect of the concentrated moment, the beam bending moment diagram ().
A. mutation
B. No mutation
C. There corner
D. can not be determined
15. The safety factor n is a constant size ().
A. greater than. 1
B. less than. 1
C. equal. 1
D. Not regulated
16. A reinforced concrete beam, the reinforcement effect is resistant to stretching, as to be arranged along the reinforcing bar ().
A. principal tensile stress trace
B. principal stress trace
C. principal tensile and compressive stresses main traces
D. primary or main draw stress trace
17. In the added steel () can increase the strength of steel.
Silicon A.
B. manganese
C. Nickel
D. can
18. The following () is correct.
Mechanics main A. Mechanical various materials
mechanical properties main B. Mechanical various materials
main lever Law C. Mechanical force after deformation and destruction of the
main lever of various types of mechanical D. the relationship of forces and materials
19. (), the center of gravity more suitable for calculating the position of the negative area method.
A. object from a combination of several simple shape
B. complex shape of the object
C. porous interior of the body
D. any shape of the object
20. The following statements on the primary and principal moment vector is incorrect ().
A. main vector force than the original force system
B. principal moment of the force system co the original moment
C. principal vector and the principal moment acting on behalf of the sum of the original force system
D. principal vector described original translational force system acting on the object
