Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

3A1 > 201-250 > Flashcards

201-250 Flashcards

1
Q
  1. If we find the maximum load applied to a sample being subjected to an ultimate tensile strength test, and know the cross-sectional area of the sample prior to testing, we can calculate the ultimate tensile strength of the sample by:

a. Dividing the original cross-sectional area into the maximum load applied
b. Multiplying the original cross-sectional area by the maximum load applied
c. Dividing the final cross-sectional area by the maximum load applied
d. Dividing the original cross-sectional area by the maximum load applied and multiplying by the cross-sectional area found at the break
e. Dividing the original cross-sectional area into the minimum load applied

A

a. Dividing the original cross-sectional area into the maximum load applied

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  1. If the factor of safety was increased on an object from 4 to 5, the load on the object operating at maximum safe working conditions:

a. Could be increased from the original
b. Could be increased providing new safety values were installed
c. Must be reduced from the original
d. Could be maintained at original
e. Must be increased to one times the value of the maximum working load

A

c. Must be reduced from the original

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. If the operating temperature of a vessel operating at maximum allowable working stress was increased the safety factor value:

a. Remains unchanged
b. Will be increased
c. Will be reduced
d. Remains unchanged providing the vessel was fitted with high temperature alarms
e. Will be decreased to two times the original

A

c. Will be reduced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. The formula, strain equals change in length divided by original length, is used to find:
1.     The strain in an object subjected to compressive loading
2.     The strain in an object subjected to tensile loading
3.     Young's modulus

a. 1
b. 2, 3
c. 1, 2
d. 1, 3
e. 1, 2, 3

A

c. 1, 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. When calculating the ultimate strength of a material we should:

a. Multiple the maximum load by the original cross-sectional area
b. Multiply the maximum load by the new cross-sectional area
c. Divide the maximum load by the new cross-sectional area
d. Divide the maximum load by the original cross-sectional area
e. Multiply the maximum load by the original cross-sectional area

A

d. Divide the maximum load by the original cross-sectional area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  1. The ultimate strength of a material is:

a. Same as the elastic limit
b. Factor of safety multiplied by the safe working stress.
c. Same as the yield point
d. Inverse of Young’s modulus
e. The maximum load times the original area

A

b. Factor of safety multiplied by the safe working stress.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  1. Moment of a force is equal to force multiplied by:

a. Parallel distance to the pivot
b. Linear distance to the pivot
c. Perpendicular distance to the pivot
d. Slant distance to the pivot
e. Horizontal distance to the pivot

A

b. Linear distance to the pivot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  1. A simple beam is a beam that is supported at one end.

a. True
b. False

A

b. False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
  1. A load carried by a beam will produce bending stress.

a. True
b. False

A

a. True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  1. If a beam has its supports arranged so that the beam is free to move on the supports and no additional forces occur the beam is said to be:

a. Simple supported
b. Amply supported
c. Singularly supported
d. Supported
e. Strongly supported

A

a. Simple supported

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
  1. When the sum of the clockwise moments equals the anti-clockwise moments then:

a. Both forces are zero
b. Equilibrium exists
c. The resultant is reduced
d. The resultant is increased
e. The equilibrium is greater than the resultant

A

b. Equilibrium exists

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q
  1. For a lever to be in equilibrium the:

a. Clockwise moments must equal zero
b. Anti-clockwise moments must equal zero
c. Lever must have a torquing effect
d. Clockwise moments must equal the anti-clockwise moments
e. Clockwise moments must be greater than the anti-clockwise moments

A

d. Clockwise moments must equal the anti-clockwise moments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q
  1. The moment of a force is the turning effect:

a. Opposite to the perpendicular force
b. About a given point
c. Of the resistance to movement
d. Of a short period of time
e. On an object due to gravity

A

b. About a given point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q
  1. A beam supported at both ends has a concentrated load of 70 kg at a distance of 4 m from one end and 8 m from the other end. This load produces a stress of the type classed as:
1.     Shearing
2.     Tensile
3.     Torsional
4.     Bending

a. 2, 3
b. 1, 3
c. 3, 4
d. 1, 4
e. 1, 2, 3, 4

A

d. 1, 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  1. The magnitude of the moment of a force is equal to:

a. Force times the area
b. Force times the time
c. Force times the pressure
d. Force times the perpendicular distance
e. Force times the circular distance

A

d. Force times the perpendicular distance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  1. A 6 m long cantilever beam carries a concentrated load of 45 kN at its free end. What is the shear force at the wall?

a. 270 kNm
b. 270 kN
c. 45 kN
d. 7.5 kN/m
e. 0.133 kN

A

b. 270 kN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q
  1. Reaction forces are those:

a. Those which support the beam
b. Clockwise movements
c. Internal forces in the beam
d. The sum of the clockwise movements

A

a. Those which support the beam

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q
  1. A simply supported beam is 8 m long and has a concentrated load of 40 kN at 3 m from the left end support and a concentrated load of 30 kN at 2 m from the right hand end. Find the support reactions. (Neglect the mass of the beam).

a. R1 = 37.5 kN, R2 = 32.5 kN
b. R1 = 32.5 kN, R2 = 37.5 kN
c. R1 = 35 kN, R2 = 35 kN
d. R1 = 30.5 kN, R2 = 39.5 kN
e. R1 = 40 kN, R2 = 30 kN

A

b. R1 = 32.5 kN, R2 = 37.5 kN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q
  1. When a simply supported, horizontal beam has a load of 19 620 kN hanging from the centre of the beam, the supports on each end of the beam carry an equivalent mass of:

a. 900 kg
b. 1200 kg
c. 9810 kg
d. 100 t
e. 1000 t

A

e. 1000 t

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q
  1. A cantilever pivoted at one end is 6 m long. The load due to the lever’s weight is 9 N, and it acts through its mid-point. At 1 m from the pivoted end a force of 298 N acts in an upward direction. To keep the system in balance, a load must be placed at the extreme end of the cantilever. What is the magnitude of that load?

a. 243 N
b. 149.79 N
c. 45.17 kg
d. 45.17 N
e. 41.75 kg

A

d. 45.17 N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q
  1. A beam, simply supported at both ends, is 12 m long and has uniformly distributed load of 10 N/m. The beam supports concentrated loads of 150 N at 3 m from the left end and 350 N at 8 m from the left end. The reaction at the left end is:

a. 229.2 N
b. 289.2 N
c. 330 N
d. 3420 N
e. 39 kN

A

b. 289.2 N

22
Q
  1. A cantilever beam 4 m long carries a concentrated load of 100 kN at its free end. The beam is also uniformly loaded at 10 kN/m over its entire length. The shear force at the wall is:

a. 100 kN
b. 110 kN
c. 40 kN
d. 140 kN
e. 480 kN

A

d. 140 kN

23
Q
  1. The factor of safety for both new and used boilers is set out by the ASME code.

a. True
b. False

A

b. False

24
Q
  1. A beam 20 meters long rests on a support at each extreme end and carries a uniformally distributed load of 50 N per meter of length. Find the bending moment and shearing force at the center section of the beam.

a. SF = 0 N BM = 2500 Nm counterclockwise
b. SF = 0 N BM = 2500 Nm clockwise
c. SF = 1000 N BM = 2500 counterclockwise
d. SF = 500 N BM = 2500 counterclockwise
e. SF = 500 N BM = 2500 clockwise

A

a. SF = 0 N BM = 2500 Nm counterclockwise

25
Q
  1. A beam 20 meters long rests on a support at each extreme end and carries a load of 10 N at the center of its length. Find the bending moment and shearing force at the center section of the beam.

a. SF = 5N upwards BM = 100 N m clockwise
b. SF = 5 N downwards BM = 100 N m counterclockwise
c. SF = 5N upwards BM = 50 N m counterclockwise
d. SF = 0 N BM = 50 N m counterclockwise
e. SF = 0 N BM = 50 N m clockwise

A

c. SF = 5N upwards BM = 50 N m counterclockwise

26
Q
  1. A force of 20 N balances a force of 36 N at the extremities of a weightless 14 meter long lever. Calculate the length of the arms from the fulcrum.

a. 7 and 7 m
b. 6 and 8 m
c. 6 and 6 m
d. 5 and 9 m
e. 10 and 4 m

A

d. 5 and 9 m

27
Q
  1. A uniform rod is 10 meters long and provides a force of 30 N. Forces of 40 and 50 N are suspended from its ends. Compute the position of the fulcrum.

a. 5.0 m from the 40 N force
b. 5.0 m from the 50 N force
c. 5.4 m from the 50 N force
d. 4.6 m from the 40 N force
e. 5.4 m from the 40 N force

A

e. 5.4 m from the 40 N force

28
Q
  1. A beam is simply supported at both ends and, carries a concentrated load of 1000 N. The types of stresses that are set up in the bar are:

a. Shear stress and bending stress
b. Compression and tension stress
c. Concentrated load and shear stress
d. Compression stress and bending stress
e. Tension stress and shear stress

A

a. Shear stress and bending stress

29
Q
  1. The number designations of a steel “I” beam such as 12I31.8 are:

a. 12 cm is the length and 31.8 cm is the width
b. 12” in nominal depth and 31.8” in nominal width
c. 12” in nominal depth and 31.8 pounds per linear foot.
d. 12 cm in nominal width and 31.8 kg per linear meter
e. 31.8 cm in nominal depth and 12 cm in nominal width

A

c. 12” in nominal depth and 31.8 pounds per linear foot.

30
Q
  1. From the list of conditions, select the condition/conditions that applies to the equilibrium of beams:
1.     Downward forces equal to upward forces
2.     Shear forces equal to all applied forces 
3.     Forces to the right equals to the forces to the left
4.     There should have no couples
5.     Clockwise movements equals to the anticlockwise movements

a. 1, 3 only
b. 2, 3 and 5 only
c. 1, 2, and 5 only
d. 1, 3 and 5 only
e. 1, 2, 3, 4 and 5

A

d. 1, 3 and 5 only

31
Q
  1. Shear force at any section or point in a beam is the algebraic sum of:

a. All the concentrated loads to the right or left of the section being considered
b. All the distributed loads to the right or left of the section being considered
c. All the external forces
d. All the parallel forces to the right or left of the section being considered
e. All the vertical forces to the right or to the left of the section being considered

A

e. All the vertical forces to the right or to the left of the section being considered

32
Q
  1. The bending moment at any section in a beam is the algebraic sum of:

a. The upward forces and downward forces
b. Movements to the left or the right of the section being considered
c. The distributed loads and the concentrated loads
d. Movements at the support
e. All the force couples acting on the beam

A

b. Movements to the left or the right of the section being considered

33
Q
  1. The movement of a force about a point is:

a. The component that will bring the system to equilibrium
b. The force multiplied by the resultant
c. The force multiplied by the equilibrant
d. The force multiplied by the perpendicular distance between the force and the pivot point
e. Equal to time multiplied by the force

A

d. The force multiplied by the perpendicular distance between the force and the pivot point

34
Q
  1. A column 10 cm diameter and 2 m long is subject to a compression force of 800 kN, which shortens the column 1 mm. Find the modulus of elasticity.

a. 20 371 kPa
b. 101 859 kPa
c. 20 372 MPa
d. 201 850 MPa
e. 203.72 GPa

A

e. 203.72 GPa

35
Q
  1. A steel tube is 8 m long, and has a net cross sectional area of 0.002 m2. It hangs vertically with a load of 500 Kg at its lower end. If the modulus of elasticity is 210 x 103 MPa, find the extension of the tube.

a. 0.0117 m
b. 0.0117 cm
c. 0.093 mm
d. 0.00093 mm
e. 1.117 m

A

c. 0.093 mm

36
Q
  1. A steel bar is 4 m long, and has a cross section of 3 cm x 4 cm. It is in tension from a force of 360 kN. Find the stress induced.

a. 300 kPa
b. 300 MPa
c. 120000 kPa
d. 300000 kN/cm2
e. None of the above

A

b. 300 MPa

37
Q
  1. A steel tube is 7 m long and is 6 cm OD with a wall thickness of 4 mm. It hangs vertically with a load of 400 kg attached to its lower end. If the modulus of elasticity is 210 x 106 kPa, find the stress induced in pipe material.

a. 1.39 MPa
b. 1.47 MPa
c. 3.47 MPa
d. 5.57 MPa
e. 12.49 MPa

A

d. 5.57 MPa

38
Q
  1. A knuckle joint is made up of a forked end with a 2 cm diameter pin through it, to hold the other section in place. The joint is under tension from a force F of 20 kN. Calculate the shearing stress in the pin.

a. 15 915 kPa
b. 31 831 kPa
c. 33 781 kPa
d. 63 662 kPa
e. 318 MPa

A

b. 31 831 kPa

39
Q
  1. Two (2) 19 mm bolts are supporting a load of 7 255 kg from an overhead beam. The allowable stress on the bolt material is 112 740 kPa. Determine the factor of safety.

a. 0.449
b. 0.898
c. -0.898
d. 1.898
e. None of the above

A

e. None of the above

40
Q
  1. The working stress of a material that has an ultimate strength of 525 MPa and a safety factor of 7 would be:

a. 3675 MPa
b. 367.5 MPa
c. 75 MPa
d. 525 kPa
e. 75 kPa

A

c. 75 MPa

41
Q
  1. A steam engine has a piston 20 cm in diameter, and a piston rod of 4 cm diameter. If the ultimate strength for the rod material is 400 000 kPa, and the factor of safety for the rod is 12, calculate the maximum allowable steam pressure.

a. 1 333 kPa
b. 1.333 GPa
c. 3333 kPa
d. 6031.87 kPa
e. 192 000 kPa

A

a. 1 333 kPa

42
Q
  1. Three bolts are required to carry a total load of 6.75 tonnes. If the stress allowed in the material is 55 900 kPa, calculate the minimum diameter of the bolts, and state the standard size of bolt you would use.

a. 0.88 mm, M8
b. 22.4 mm, M24
c. 25.4 mm, M27
d. 28.5 mm M30
e. 66.4 mm, M68

A

b. 22.4 mm, M24

43
Q
  1. A steel bar is 7 m long, 10 cm wide and 1.25 cm thick. The bar is subjected to a tensile force of 133,000 N. The stress produced in the bar is:

a. 106400 Pa
b. 106400 Kpa
c. 106400 Mpa
d. 106400 N
e. 106400 KN

A

b. 106400 Kpa

44
Q
  1. A steel wire 6 mm in diameter is used for hoisting purposes in building construction. If 150 m of the wire is hanging vertically, and a load of 1 kN is being lifted at the lower end of the wire, determine the elongation of the wire. Ignore the mass of the wire itself. Assume that E = 200 GPa.

a. 106.1 mm
b. 39.78 mm
c. 26.5 mm
d. 10.61 mm
e. 2.65 mm

A

c. 26.5 mm

45
Q
  1. A 65 cm diameter piston rod is subjected to a maximum load of 500 KN. The tensile strength of the material is 8900 Kpa. What is the factor of safety.

a. 5.3
b. 8
c. 3
d. 5.9
e. 6.4

A

d. 5.9

46
Q
  1. A specimen of certain material 4.6 cm in diameter is tested in a tensile testing machine until it breaks. The maximum load applied is 781793 N. Calculate the ultimate tensile strength of the material.

a. 995.41 kPa
b. 995.41 Pa
c. 995.41 MPa
d. 995407 kPa
e. 995407 MPa

A

a. 995.41 kPa

47
Q
  1. A steel rod 6 m long has a cross-sectional area of 71 cm and is stretched 1.2 cm by a load suspended from one end. (E=210 GPa). Find the stress produced by the load.

a. 420, 000 Pa
b. 420, 000, 000 Pa
c. 420, 000 MPa
d. 420, 000,000 kPa
e. 420, 000 kPa

A

e. 420, 000 kPa

48
Q
  1. A straight aluminum wire 60 m long is subjected to a stress of 90 MPa. Determine the total elongation of the wire. Assume E = 70 GPa.

a. 38.57 mm
b. 47.66 mm
c. 46.67 mm
d. 76.67 mm
e. 77.14 mm

A

e. 77.14 mm

49
Q
  1. A rod is 710 mm in diameter and has a tensile strength of 413 MPa. The rod supports a load of 143.6 KN. What is the factor of safety.

a. 1138.68
b. 4
c. 11.38
d. 1.138
e. 113

A

a. 1138.68

50
Q
  1. A steel rod 3 m long has a cross-sectional area of 26 cm2 and is stretched 0.05 cm by a load suspended from one end. Young’s modulus is 210 X 106kPa. What is the stress produced by the load?

a. 35 kPa
b. 35 MPa
c. 35 Pa
d. 350 kPa
e. 350 Pa

A

b. 35 MPa

3A1 (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions