Power Engineering 4A - Unit 1 -
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
What is the power required to apply a 200kN force over a distance
of 15m in 15 seconds?
Select one:
a. 3000 W
b. 1500 kW
c. 1000 kW
d. 200 kW -
correct answer ✅D
A 7m long bar is pivoted at 2m from the left end. A force of 60N is
applied downwards on the left end and a force of 20N is applied
downward on the right end. What would be the clockwise and
counter-clockwise moments about the pivot, due to each force, and
in which direction would the bar rotate?
Select one:
a. 120Nm counter-clockwise, 100Nm clockwise, clockwise rotation.
b. 120Nm counter-clockwise, 100Nm clockwise, counter-clockwise
rotation.
c. 80Nm counter-clockwise, 100Nm clockwise, counter-clockwise
rotation.
,Power Engineering 4A - Unit 1 -
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
d. 60Nm counter-clockwise, 100Nm clockwise, clockwise rotation. -
correct answer ✅B
A titanium bar with a mass of 2kg and a length of 3m shortens by
0.02mm under a compressive load of 3900kN. What is the strain?
Select one:
a. 6.66 x 10-3
b. -1.9 x 102
c. 0.000006666
d. 1.9 x 10-3 -
correct answer ✅C
External tensile forces acting parallel but not in line produce
_________ in an object.
Select one:
a. Shear stress
b. Working stress
c. Compressive stress
,Power Engineering 4A - Unit 1 -
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
d. Tensile stress -
correct answer ✅A
The ratio between the ultimate strength and the allowable stress is
called the:
Select one:
a. Working stress
b. Safety factor
c. Maximum allowable load
d. Ultimate stress -
correct answer ✅B
The ability of a material to return to its original shape after the
force or load that caused the deformation is removed is called:
Select one:
a. Ductility
b. Elasticity
c. Stiffness
, Power Engineering 4A - Unit 1 -
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
d. Plasticity -
correct answer ✅B
1 psi equals:
Select one:
a. 0.145 kPa
b. 6.89 kPa
c. 1 kilopascal
d. 100 kPa -
correct answer ✅B
How much work is done by a pump with a 0.1m diameter piston,
traveling 250mm against a pressure of 1500kPa?
Select one:
a. 3.72 kJ
b. 5.9 kJ
c. 1.96 kJ
d. 2.95 kJ -
correct answer ✅D
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
What is the power required to apply a 200kN force over a distance
of 15m in 15 seconds?
Select one:
a. 3000 W
b. 1500 kW
c. 1000 kW
d. 200 kW -
correct answer ✅D
A 7m long bar is pivoted at 2m from the left end. A force of 60N is
applied downwards on the left end and a force of 20N is applied
downward on the right end. What would be the clockwise and
counter-clockwise moments about the pivot, due to each force, and
in which direction would the bar rotate?
Select one:
a. 120Nm counter-clockwise, 100Nm clockwise, clockwise rotation.
b. 120Nm counter-clockwise, 100Nm clockwise, counter-clockwise
rotation.
c. 80Nm counter-clockwise, 100Nm clockwise, counter-clockwise
rotation.
,Power Engineering 4A - Unit 1 -
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
d. 60Nm counter-clockwise, 100Nm clockwise, clockwise rotation. -
correct answer ✅B
A titanium bar with a mass of 2kg and a length of 3m shortens by
0.02mm under a compressive load of 3900kN. What is the strain?
Select one:
a. 6.66 x 10-3
b. -1.9 x 102
c. 0.000006666
d. 1.9 x 10-3 -
correct answer ✅C
External tensile forces acting parallel but not in line produce
_________ in an object.
Select one:
a. Shear stress
b. Working stress
c. Compressive stress
,Power Engineering 4A - Unit 1 -
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
d. Tensile stress -
correct answer ✅A
The ratio between the ultimate strength and the allowable stress is
called the:
Select one:
a. Working stress
b. Safety factor
c. Maximum allowable load
d. Ultimate stress -
correct answer ✅B
The ability of a material to return to its original shape after the
force or load that caused the deformation is removed is called:
Select one:
a. Ductility
b. Elasticity
c. Stiffness
, Power Engineering 4A - Unit 1 -
Elementary mechanics and dynamics
Exam Questions & Answers (Grade
A+)
d. Plasticity -
correct answer ✅B
1 psi equals:
Select one:
a. 0.145 kPa
b. 6.89 kPa
c. 1 kilopascal
d. 100 kPa -
correct answer ✅B
How much work is done by a pump with a 0.1m diameter piston,
traveling 250mm against a pressure of 1500kPa?
Select one:
a. 3.72 kJ
b. 5.9 kJ
c. 1.96 kJ
d. 2.95 kJ -
correct answer ✅D
