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3A1 > 251-300 > Flashcards

251-300 Flashcards

1
Q
  1. A steel rod 3 m long has a cross-sectional area of 0.26 m2 and is stretched 0.05 cm by a load suspended from one end. The stress produced by the load is 350 kPa. Young’s modulus is 210 X 106. What is the load?

a. 91000 KN
b. 910 KN
c. 91000 Pa
d. 91000 N
e. 910 kPa

A

d. 91000 N

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2
Q
  1. A steel rod has a factor of safety of 4.3. The maximum stress on the rod is 5431 kPa. What is the ultimate strength of the steel rod.

a. 23353.3 Pa
b. 23353.3 kPa
c. 23353.3 MPa
d. 23353.3 N
e. 23353.3 KN

A

b. 23353.3 kPa

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3
Q
  1. A steel rod is 100 cm long and is subjected to a load of 10,000 N. While subjected to this load the length of the bar remains the same. Young’s modulus is 306 GPa. Determine the strain on the bar.

a. 10
b. 5
c. 1
d. 0
e. None of the above

A

d. 0

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4
Q
  1. A steel rod is 5 m long and has a cross-sectional area of 0.26 m2. When subjected to a load of 1421 N the rod is stretched to .0012 m. What is Young’s modulus for this material?

a. 22.772 GPa
b. 22.772 MPa
c. 22.772 kPa
d. 22.772 MN
e. 22.772 GN

A

b. 22.772 MPa

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5
Q
  1. If the factor of safety of a piston under a working load of 800 KN is 7.85 what is the diameter of the piston if the ultimate strength of the material is 800,000 kPa.

a. 10 cm
b. 10 mm
c. 5 cm
d. 5 mm
e. .05 m

A

a. 10 cm

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6
Q
  1. A 2.5 cm diameter bolt is in double shear and carries a load of 30 KN. What is the shear stress in the bolt?

a. 30,559 MPa
b. 61,115 MPa
c. 61,115 Pa
d. 30,559 kPa
e. 61,115 kPa

A

d. 30,559 kPa

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7
Q
  1. Hook’s Law applies to the portion in the stress-strain diagram where the curve representing the relationship between the stress and strain is:

a. Slightly curved upward
b. Linear
c. Slightly curved downward
d. Horizontal
e. Exponential

A

b. Linear

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8
Q
  1. According to Hooke’s Law, the stress in an elastic body is directly proportional to the strain if:

a. The yield point of the material is exceeded
b. The elastic limit of the material is exceeded
c. Young’s Modulus changes proportionally with stress
d. The factor of safety is not exceed
e. The elastic limit is not exceeded

A

e. The elastic limit is not exceeded

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9
Q
  1. In the equation where, E is known as the modulus of elasticity or __________.

a. the modulus of rigidity
b. the plastic modulus
c. the Wong’s modulus
d. the Young’s modulus
e. the modulus of elongation

A

d. the Young’s modulus

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10
Q
  1. The yield point for a material is the point at which it undergoes large deformation at a/an____________.

a. Accelerated stress
b. Maximum stress
c. Variable stress
d. Constant stress
e. Minimum stress

A

d. Constant stress

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11
Q
  1. The ultimate stress of a material is determined by the experimental test. The ultimate stress of a material can be calculated according to the following:

a. Multiplying the maximum load by the original cross-sectional area of the test sample.
b. Multiplying the maximum load by the new cross-sectional area of the test sample.
c. Dividing the maximum load by the new cross-sectional area of the test sample.
d. Dividing the breaking load by the new cross-sectional area of the test sample.
e. Dividing the maximum load by the original cross-sectional area of the test sample.

A

e. Dividing the maximum load by the original cross-sectional area of the test sample.

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12
Q
  1. If a material is stressed beyond the proportional limit and does not totally regain its original shape when the stress is removed, the amount of deformation is called:

a. Permenant strain
b. Plastic set
c. Strain
d. Maximum set
e. Permenant set

A

c. Strain

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13
Q
  1. A hole 12 mm in diameter is to be punched through a plate 18 mm thick. If the shear strength of the material is 300 N/mm2, find the load required on the punch.

a. 2036 N
b. 203.6 Kg
c. 203.6 Pa
d. 203.6 KN
e. None of the above

A

d. 203.6 KN

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14
Q
  1. The ratio of shear stress to shear strain is called the modulus rigidity (G). It is also known as the:

a. Modulus of elasticity
b. Shearing modulus of elasticity
c. Young’s modulus
d. Shear stress modulus of plasticity
e. Wong’s shear modulus

A

c. Young’s modulus

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15
Q
  1. A tie bar made of mild steel of tensile strength 462 MN/m2 is to carry a tensile load of 11.12 KN, find its diameter allowing a factor of safety of 12.

a. 19.17 mm
b. 19.17 cm
c. 1.917 m
d. 14.36 mm
e. 14.36 cm

A

a. 19.17 mm

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16
Q
  1. Safe working stress is determined by:

a. Interpolation
b. Extrapolation
c. Dividing the ultimate stress by the factor of safety
d. Multiplying the ultimate stress by the strain
e. The average value of the breaking stress determined by testing

A

c. Dividing the ultimate stress by the factor of safety

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17
Q
  1. A safe load of 20.31 KN is carried by a stud of 580.2 mm2 in cross-sectional area at the bottom of the thread. The bolt has a safe working stress of 35 MN/m2. Calculate the number of studs required to hold the cylinder cover of a diesel engine where the maximum pressure in the cylinder is 42 X 105 N/m2 and the diameter of the cover is 380 mm.

a. 23
b. 10
c. 20
d. 25
e. 24

A

e. 24

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18
Q
  1. The ratio of the output force to the input force is called the:

a. Actual mechanical advantage
b. Ideal mechanical advantage
c. Velocity ratio
d. Velocity proportion
e. Mechanical ratio

A

a. Actual mechanical advantage

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19
Q
  1. Velocity ratio is:

a. Ideal efficiency
b. Actual mechanical advantage
c. Actual efficiency
d. Actual mechanical ratio
e. Ideal mechanical advantage

A

e. Ideal mechanical advantage

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20
Q
  1. The efficiency of any apparatus is given by the ratio:

a. Input divided by output
b. Distance effort moves divided by distance load moves
c. Output divided by input
d. Load divided by effort
e. Load multiplied by effort

A

c. Output divided by input

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21
Q
  1. Load multiplied by distance load moves divided by effort multiplied by distance effort moves is the:

a. Mechanical advantage of a simple machine
b. Velocity ratio of a simple machine
c. Efficiency of a simple machine
d. Torquing effect of a simple machine
e. Ratio of the mechanical advantage of a simple machine

A

c. Efficiency of a simple machine

22
Q
  1. Actual mechanical advantage divided by velocity ratio is equal to:

a. Efficiency
b. Velocity ratio
c. Ideal mechanical advantage
d. Equilibrium
e. Resultant

A

a. Efficiency

23
Q
  1. A solid brass statue has a mass of 20 000 kg. What mass of steel would be required to exactly duplicate the structure?

a. 303.5 kg
b. 18 738 kg
c. 21 347 kg
d. 21 593 kg
e. 21 953 kg

A

b. 18 738 kg

24
Q
  1. A bar with a diameter of 494 mm and a length of 1.5 m has a square hole with 177.8 mm sides through its axis. If the mass of the bar is 2 027.1 kg, find the relative density of this material.

a. 10.7
b. 9.77
c. 9.77 kg/m3
d. 8.44
e. 8.44 kg/m3

A

d. 8.44

24
Q
  1. A solid cylinder is 31 cm dia. by 2.4 m long. It has the same mass as a lead cube with 0.5 m sides. What material is the cylinder likely made of?

a. mild steel
b. wrought iron
c. brass
d. copper
e. cobalt

A

a. mild steel

25
Q
  1. A cylindrical tank has its axis vertical. It is 2 m in diameter and its mass is 800 kg. When it is filled to 2 m high with oil, the total mass is 5050 kg. What is the relative density of the oil?

a. 6.312
b. 6.764 kg/m3
c. 6.764
d. 0.876
e. 0.6764

A

e. 0.6764

26
Q
  1. A pile of coal that forms a perfect cone shape has a base area of 24 m2 and a height of 15 m. Assuming the pile has 25 percent of void space, and that the density of the coal given is 1400 kg/m3, determine the mass of the coal in this pile.

a. 12 600 kg
b. 14 700 kg
c. 54 000 kg
d. 126 t
e. 168 t

A

d. 126 t

27
Q
  1. A solid 1345 kg object is totally submerged in a tank of ether with a relative density of 0.74. If the object has a relative density of 5.8, what is the mass of ether that will be displaced?

a. 171.6 kg
b. 171.6 liters
c. 171.6 N
d. 171.6 m3
e. 171.6 cubic liters

A

a. 171.6 kg

28
Q
  1. A piece of coal has a mass of 1.08 kg. The relative density of this piece is 1.4. Find its volume in cubic meters.

a. 1.296 m3
b. 1.296 x 103 m3
c. 7.7 x 10-4 m3
d. 17.7 x 10-4 m3
e. 7.7 x 104 m3

A

c. 7.7 x 10-4 m3

29
Q
  1. A block of wood measures 20 cm wide x 15 cm deep and has a specific gravity of 0.75. If its mass is 8 kg, find the length of the block.

a. 3.56 cm
b. 13.56 cm
c. 35.6 cm
d. 105 mm
e. 10 667 cm

A

c. 35.6 cm

30
Q
  1. A 5000 litre oil tank contains 60 litres of water. If the water is drained off and replaced with fresh oil of relative density 0.95, what is the change in the mass of the tank’s contents?

a. 4940 kg
b. 4750 kg
c. 60 kg
d. 5 kg
e. 3 kg

A

e. 3 kg

31
Q
  1. A 400 kg block of steel is placed on top of 1.17 m3 of solid copper. 70 kg of aluminum are laid on the steel. Calculate the average weight density of the combined masses. The relative density for steel is 7.87, for copper: 8.77, and for aluminum: 2.56.

a. 84 273 N/m3
b. 84 654 N/m3
c. 90 813 N/m3
d. 6 400 kg/m3
e. 62 784 N/m3

A

b. 84 654 N/m3

31
Q
  1. “Standard conditions” used to compare mass densities of several substance are set at:

a. 25°C and 25 atmospheric pressure
b. 20°C and one atmospheric pressure
c. 20°C and zero atmospheric pressure
d. Zero °C and zero atmospheric pressure
e. Zero °C and one atmospheric pressure

A

d. Zero °C and zero atmospheric pressure

32
Q
  1. The unit of relative density is:

a. kg/m3
b. lbs/ft3
c. N/m2
d. none
e. kg/cm3

A

d. none

32
Q
  1. The “relative density” of a substance refers to:

a. The density of a substance compared to the density of water
b. The density of a substance compared to the density of air at standard conditions
c. The density of a substance compared to the density of gold
d. The density of a substance compared to the density of the same substance at standard conditions
e. The density of water divided by the density of other substance

A

a. The density of a substance compared to the density of water

32
Q
  1. Weight Density of a substance is defined as weight per unit of volume. Its unit is:

a. m3/kg
b. ft3/lb
c. lb/ft3
d. kg/m3
e. N/m3

A

c. lb/ft3

32
Q
  1. The “mass density” of a substance is commonly called “density.” It has a unit of:

a. kg/cm3
b. N/kg
c. kg/m3
d. lbs/ft2
e. m3/kg

A

c. kg/m3

33
Q
  1. Specific weight is:

a. A unit used to indicate volume per unit weight
b. A term used in the Imperial System only
c. Equal to the ratio of mass to its force
d. Used to indicate density of a substance compared to the density of water
e. Force per unit of area

A

b. A term used in the Imperial System only

33
Q
  1. Specific Gravity used in the Imperial system is equivalent to the _______ used in the metric system.

a. relative density
b. relative gravity
c. specific density
d. weight density
e. specific weight

A

a. relative density

33
Q
  1. An internal combustion engine has 8 cylinders, the diameter of each of the pistons is 10 cm. Assuming the force of explosion within the cylinder is 314.16 N, determine the average pressure acting on each of the cylinders.

a. 1 MPa
b. 4 MPa
c. 8 MPa
d. 16 MPa
e. 32 MPa

A

e. 32 MPa

33
Q
  1. The ambient pressure measures 100.78 kPa in a beautiful Prince George, BC. The hot water boiler pressure gauge recorded a pressure of 85 kPa. Determine the absolute pressure under which this boiler is operating.

a. 15.78 kPa
b. 85 kPa
c. 115.325 kPa
d. 135.78 kPa
e. 185.78 kPa

A

e. 185.78 kPa

34
Q
  1. An oil well is 2 kilometers in depth. What pressure is necessary at the bottom of the well in order to force oil of relative density 0.70 to the top.

a. 14 000 Pa
b. 536.76 kPa
c. 686.7 kPa
d. 1400 kPa
e. 13 734 KPa

A

e. 13 734 KPa

34
Q
  1. A storage tank is 6.5 m high and 1.75 meters in diameter. It is filled to within 0.75 meters from the top of the tank with an oil that has a relative density of 0.72. What is the pressure in kPa at the bottom of the tank?

a. 42305.6 kPa
b. 42305.6 Pa
c. 42.305 kPa
d. 42.305 N
e. 42.305 Pa

A

c. 42.305 kPa

34
Q
  1. A swimming pool is 4 m deep. What is the gauge pressure on the at of the bottom of the pool?

a. 4 000 Pa
b. 11 kPa
c. 24.3 kPa
d. 39.24 kPa
e. 140.54 kPa

A

d. 39.24 kPa

35
Q
  1. A storage tank is 6.5 m high and 1.75 meters in diameter. It is filled to within 1 meter from the top of the tank with an oil that has a relative density of 0.63. What is the pressure in kPa at a fitting located halfway up the side of the tank.

a. 13287.6 Pa
b. 13.38 kN
c. 13.28 N
d. 13.287 kPa
e. 13287.6 kPa

A

d. 13.287 kPa

35
Q
  1. A tank is 8 m long, 6 m wide and is filled to a depth of 8 m with gasoline. Density of the gasoline is 672 kg/m3. Determine the pressure at the bottom of the tank.

a. 52.74 KPa
b. 53.76 KPa
c. 403.2 KPa
d. 527.4 KPa
e. 624.3 KPa

A

a. 52.74 KPa

36
Q
  1. A rectangular tank is 10 meters long, 2 meters wide and 6 meters high. The tank is filled to the 4 meter mark with a liquid having a relative density of 1.24. What is the pressure on the bottom of the tank?

a. 97315.2 N
b. 97315.2 Pa
c. 97315 kN
d. 97315 kPa
e. None of the above

A

a. 97315.2 N

36
Q
  1. What is the pressure in kPa at the back end of a boiler where the draft gauge indicates a reading of 230 mm of H20?

a. 230 Pa
b. 230 kPa
c. 3.4 Pa
d. 2.256 kPa
e. 2.256 Pa

A

d. 2.256 kPa

36
Q
  1. How much will the mercury in a manometer be displaced if the pressure difference being measured is 100 kPa?

a. 751.8 cm
b. 75.18 m
c. 7.5 mm
d. 7.5 cm
e. 751.8 mm

A

e. 751.8 mm

36
Q
  1. In a fluid contained by solid boundaries the pressure exerted by the enclosed fluid on its boundaries is always ____________.

a. normal or perpendicular
b. constant at all directions
c. equal
d. measured in kgs
e. acting on the side and bottoms

A

b. constant at all directions

3A1 (12 decks)

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