151-200 Flashcards
- The various types of stress measured in the study of applied mechanics are:
a. Radiation, ultrasonic, brittle and ductile
b. Concentrated, simple, uniform and random
c. Tense, counteractive, reactive, centrifugal and opposite
d. Torsional, compressive, uniform, shear and tensile
e. Torsional, compressive, bending, shear and tensile
d. Torsional, compressive, uniform, shear and tensile
- A load exerted upon rivets will produce a stress type classed as:
a. Bending
b. Shearing
c. Torsional
d. Compressive
e. Tensile
b. Shearing
- The amount of deformation compared to the original size of a body, in applied mechanics, is referred to as:
a. Strain
b. Stress
c. Set
d. Variable
e. Elastic limit
a. Strain
- The amount a bolt stretches when subjected to a load, is divided by the original length. The ratio found is classed as:
a. Linear stress
b. Compressive stress
c. Axial stress
d. Linear strain
e. Axial thrust
d. Linear strain
- An I-beam under compressive load is found to be 0.023 mm shorter than the original length. Given the original length we can find:
a. The compressive stress
b. Tensile stress
c. Linear strain
d. Tensile strain
e. Shearing strain
c. Linear strain
- Linear strain measures the change of length per unit length when a force is applied. Which of the following forces is applied to produce linear strain?
a. Shearing
b. Double shear
c. Torsional
d. Bending
e. Tensile
e. Tensile
- Strain is defined as:
a. Deformation per unit length
b. Force which causes a change in body shape
c. Original length multiplied by the change in length
d. Original length divided by the change in length
e. Original length divided by the change in area
a. Deformation per unit length
- Hooke’s Law is used to define which of the following properties of a body?
a. Toughness
b. Hardness
c. Plasticity
d. Elastic properties
e. Ductility
d. Elastic properties
- 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 limits of the material is not exceeded
c. The elastic limits of the material is exceeded
d. Young’s Modulus remains constant
e. The yield point of the material is not exceeded
b. The elastic limits of the material is not exceeded
- Hooke’s Law determines the constant proportionality of:
a. Area to load on a body
b. Change in length to original length of a body
c. Stress to strain relation of a body
d. Unit stress of a body
e. Unit strain of a body
c. Stress to strain relation of a body
- Hooke’s Law states that when a body is under load:
a. The deformation produced is directly proportional to the stress producing it.
b. The strain produced is indirectly proportional to the stress producing it.
c. The strain produced is inversely proportional to the stress producing it.
d. The deformation produced is directly proportional to the strain producing it.
e. The deformation produced is inversely proportional to the stress producing it.
a. The deformation produced is directly proportional to the stress producing it.
- The proportionality of stress to strain is expressed as:
a. The sum of increment of stress to increment of strain
b. The grain alignment within a body.
c. The average of increments of stress to increment of strain.
d. The product of increment of stress to increment of strain.
e. The ratio of increment of stress to increment of strain.
e. The ratio of increment of stress to increment of strain.
- The modulus of elasticity (E) is also known as:
a. Elastic limit of a specimen.
b. Young’s Modulus where E = stress divided by strain.
c. Elastic section modulus where E = area divided by strain.
d. Young’s Modulus where E = strain divided by stress.
e. Young’s Modulus where E = strain multiplied by stress.
b. Young’s Modulus where E = stress divided by strain.
- If Young’s Modulus and the stress that a body is subjected to are known, which of the following can be calculated?
a. Area of the body
b. Bending moments
c. Amount of strain produced
d. Moment of force
e. The original length
c. Amount of strain produced
- A perfectly elastic material:
a. Shows no sign of strain due to loading when the load is removed
b. Maintains a new length or shape after the load is removed
c. Can only be loaded to the yield point
d. Will take any shape due to elastic ability
e. Can only be loaded to the elastic limit
a. Shows no sign of strain due to loading when the load is removed
- The modulus of elasticity is expressed in:
a. Joules
b. kPa
c. Newtons per second
d. Newtons per hour
e. kN
b. kPa
- The stress in an elastic body is directly proportional to the strain if the elastic limit of the material is not exceeded, is called:
a. Young’s Modulus
b. Hooke’s Law
c. Modulus of elasticity
d. None of the above
b. Hooke’s Law
- Ultimate tensile strength designed into an object must be:
a. Less than the allowable working stress
b. Greater than the allowable working stress
c. Equal to the allowable working stress
d. Varied as to greater or less than the allowable working stress depending upon the load applied
e. Ten times greater than the allowable stress
b. Greater than the allowable working stress
- When subjecting a sample to an ultimate tensile test, the test is concluded at:
a. The elastic limit
b. The load at which the sample breaks
c. The yield point
d. When the maximum elongation is obtained without rupture to the sample
e. Before the yield point
b. The load at which the sample breaks
- Ultimate strength of a material is expressed in units of:
a. Kilowatts
b. Square metres
c. Kilopascals
d. Joules
e. Kilo Newtons
c. Kilopascals
- When conducting an ultimate tensile strength test the cross sectional area of the sample considered for the test calculations is:
a. That area at the point when the elastic limit is reached
b. That area when the maximum load is applied
c. That area when the yield point is reached
d. That area known prior to the test
e. That area before the elastic limit is reached
b. That area when the maximum load is applied
- If the safe working stress and the ultimate strength of a material are known, we can find the safety factor by:
a. Subtracting the safe working stress from the ultimate strength
b. Dividing the ultimate strength by the safe working stress
c. Dividing the safe working stress by the ultimate strength
d. Dividing the difference between the safe working stress and the ultimate strength into the ultimate strength
e. Multiplying the ultimate strength by the safe working stress
b. Dividing the ultimate strength by the safe working stress
- The maximum stress produced during fracture of a material is its:
a. Brittleness
b. Ductility
c. Ultimate strength
d. Stiffness
e. Hardness
c. Ultimate strength
- The internal resistance or force of a body is known as strain.
a. True
b. False
b. False
- Young’s Modulus is a very important quantity for if it is known then the amount of stretching produced by a given stress may be calculated.
a. True
b. False
a. True
- Factor of safety is always expressed:
a. In kPa
b. In Newton metres
c. As a ratio (without units)
d. In joules
e. In kN/m
c. As a ratio (without units)
- A load exerted upon rivets produces a tensile stress.
a. True
b. False
b. False
- Strain is equal to the change in length of an object divided by the original length.
a. True
b. False
a. True
- An example of compression stress would be a load suspended from a rod.
a. True
b. False
b. False
- A simply supported beam 12 m long, carries a uniform load of 10 kN/m. The reaction force at each end is:
a. 6 kN
b. 12 kN
c. 60 kN
d. 120 kN
e. 48 kN
c. 60 kN
- Linear strain equals:
a. Change in length multiplied by the original length
b. Original length divided by the change in length
c. Original length divided into the change in length
d. Original diameter divided by the change in length
e. Original area divided by the change in length
c. Original length divided into the change in length
- The ratio between the ultimate strength of a material and its safe working stress is known as the:
a. Tensile strength
b. Yield point
c. Strain
d. Factor of safety
e. Maximum load
d. Factor of safety
- The stress in an elastic body is directly proportional to the strain if the elastic limit of the material is not exceed, is called:
a. Young’s Modulus
b. Hooke’s Law
c. Modulus of elasticity
d. Yield point
e. Maximum load
b. Hooke’s Law
- When conducting an ultimate tensile strength test, the cross-sectional area of the specimen used for calculation is:
a. The area before the test is conducted
b. The area after the test is conducted
c. The area during the test
d. Always the area taken at 100 degrees C.
e. The area between the elastic limit and yield point
a. The area before the test is conducted
- The yield point of a material is where:
a. The breaking point of the specimen occurs
b. The maximum load is applied
c. The factor of safety is increased suddenly
d. The material can be return to its original size and shape
e. The material suddenly yields to the load
d. The material can be return to its original size and shape
- The factor of safety is:
1. Ultimate strength divided by the allowable working stress 2. A ratio 3. A numerical value only 4. Between zero to one
a. 1, 2, 4
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 3
e. 1, 2, 3, 4
d. 1, 2, 3
- Safe working stress is determined by:
a. Interpolation
b. Extrapolation
c. Dividing the ultimate strength by the factor of safety
d. Multiplying the ultimate strength by the strain
e. Dividing the ultimate strength by the strain
c. Dividing the ultimate strength by the factor of safety
- The amount of deformation compared to the original size is known as:
a. Hooke’s Law
b. Yield point
c. Strain
d. Ultimate strength
e. Allowable working stress
c. Strain
- The elastic limit of a material is indicated by the point at which the elongation of the specimen:
a. Is interrupted by breaking
b. Where there is a sudden great elongation of the specimen
c. Decreases at a slower rate than the applied load
d. Increases at a faster rate than the load
e. Remains unchanged
b. Where there is a sudden great elongation of the specimen
- The ratio of a stress to the corresponding strain is known as:
a. Hooke’s Law
b. The yield point
c. The modulus of elasticity
d. The ultimate strength
e. The maximum load
c. The modulus of elasticity
- Breaking load and maximum load are the same thing.
a. True
b. False
b. False
- The factor of safety is a ratio between the ultimate strength of a material and its safe working stress
a. True
b. False
a. True
- The ultimate strength of a material is reached at the yield point.
a. True
b. False
b. False
- The elastic limits of a material is reached before a force applied to a material stresses that material beyond its yield point.
a. True
b. False
a. True
- A material under tensile stress undergoes a sudden increase in length when forced beyond its yield point.
a. True
b. False
a. True
- A material is subjected to a compressive load. As the load is increased, a sudden change in the shape of the material is noticed. When the load is removed, the material returns to its original shape. This indicates the material’s ultimate tensile strength was not reached during test.
a. True
b. False
a. True
- When considering a steel block subjected to a tensile force, we would find the stress in the block by:
1. Using the formula stress equals force divided by the area 2. Using the same formula, we use to find stress in a block subjected to a compressive force 3. Using the same formula, we use to find the shear stress in a bolt
a. 1, 2
b. 2, 3
c. 1, 3
d. 1, 2, 3
e. 1, 2, 3, 4
d. 1, 2, 3
- The formula, stress = load divided by the area, can be transposed to read stress times load when you must solve to find the correct area.
a. True
b. False
b. False
- If we are given the values for the load and the area of an object, we find the stress by dividing the load by the area.
a. True
b. False
a. True
- To find the load, when the stress and the area are known, we must multiply the stress by the area.
a. True
b. False
a. True
