Power Engineering 4th Class Chap 1-6
Test Practice Questions With Correct
Marking Scheme
/.Any action on a body, which tends to change its size, shape or its state of motion is
defined as: - Answer-✅force
/.Energy is the ability of a body to do work by virtue of its position. - Answer-✅Potential
/.A body travels 163 m in 6 seconds. What is the velocity? - Answer-✅27.166 m/s
/.Which of the following is an example of a static body? - Answer-✅a rigid body that is
at rest.
/.A bar is pivoted on the right end and a force is applied downwards on the left end. The
rotation of the bar will be: - Answer-✅counter-clockwise
/.If a system of forces is in equilibrium, then which of the following statements is true? -
Answer-✅The total forces to the right = the total forces to the left.
/.A 5 m long bar is pivoted on the right end and a force of 10 N is applied upwards on
the left end. The moment of force is: - Answer-✅50 Nm clockwise
/.An effort of 3 kN is required to move a mass of 2,000 kg in a certain simple machine.If
the mass is raised 1.5 m while the effort moves 12 m, find:
the velocity ratio (VR)
the actual mechanical advantage (MA)
and the efficiency (EFF) of the machine. - Answer-✅8, 6.54, 81.75
/.A simple wheel and axle has a wheel diameter of 3 m and an axle diameter of 25 cm.
What effort is required to raise 850 kg if the efficiency is 87%? - Answer-✅798.7
/.The ratio of the load to the effort is called: - Answer-✅actual mechanical advantage
/.A simple wheel and axle has a wheel diameter of 2.3 m and an axle diameter of 92
mm. If an effort of 26 N is required to raise a mass of 16 kg, what is the efficiency of the
machine? - Answer-✅24.1
/.Find the magnitude and direction of 4 concurrent coplanar forces:
,i) 10 N 32 degrees east of north
ii) 35 N 50 degrees east of north
iii) 25 N 72 degrees east of north
iv) 85 N 40 degrees east of south: - Answer-✅115 N 77 degrees east of south
/.A vector quantity has: - Answer-✅direction, magnitude and necessary units of the
quantity
/.A scalar quantity has: - Answer-✅both magnitude and necessary units
/.Find the magnitude and direction of 3 coplanar forces of:
i) 40 N 45 degrees east of southii) 10 N westiii) 70 N 35 degrees east of north - Answer-
✅65 N 65 degrees east of north
/.A vehicle traveling at 100 km/h decelerate uniformly to 40 km/h in 15 seconds. How far
will the vehicle travel in this time? - Answer-✅291
/.A vehicle that travels 150 km in 3 hours: - Answer-✅has an average speed of 50 km/h
/.The area under a velocity vs. time graph equals: - Answer-✅displacement
/.A body moves 180 degrees from Point A to Point B in a semicircular path. The radius
of the semicircle is 8 m. Calculate the displacement between Point A and Point B: -
Answer-✅16
/.In the SI system, the unit of force is called the Newton (N). One Newton is equal to -
Answer-✅1 kg m/s2
/.What is the kinetic energy possessed by a car, having a mass of 1500 kg and
travelling at a velocity of 50 km/h? - Answer-✅144.7
/.A body with a mass of 88 kg is moving at a velocity of 13.89 m/s. What is its kinetic
energy? - Answer-✅8489
/.The ability to do work due to an object's motion is defined as: - Answer-✅kinetic
energy
/.Regarding the equation μ = FF/RN, which statement is correct: - Answer-✅The values
for FF and RN must be measured at right angles to each other.
/.Find the mass of the refrigerator, which is just started moving by a force of 6,350 N
along a tile floor with a coefficient of friction of 0.30: - Answer-✅2157.66
, /.What are the units associated with "Coefficient of Friction": - Answer-✅there are no
units
/.If engineers require a material which would be able to be stretched and reduced in
cross section without breaking they would choose a material with which of the following
properties? - Answer-✅ductility
/.A unit of stress is: - Answer-✅kPa
/.A hole 3 cm in diameter is to be punched out of a steel plate 8 cm thick. The shear
stress of the material is 670 GPa. What load is required on the punch? - Answer-
✅5051.6
/.A compressive load of 219 kN is resisted by a rectangular strut which has one side
measuring 83 mm. If the stress in the strut is 164,909 kPa, what is the length of the
other side (or width) of the strut? - Answer-✅0.016
/.Idler gears: - Answer-✅are used to reverse rotation
/.In a drive belt system the input to the driver pulley is 265 kW and the output is 211 kW.
What is the efficiency? - Answer-✅79.6
/.A pulley of diameter 2.6 m rotates at 107 r/min and drives a follower pulley at 259
r/min. What is the diameter of the follower pulley? - Answer-✅1.074
/.Which of the following statements about belt drive systems is false? - Answer-
✅Tension in the bottom belt is always double that in the top belt.
/.Which of the following statements is true? if a person pushes with a force of 300 N on
a rock and the rock does not move: - Answer-✅no work was done
/.The unit of force used in the SI system is the: - Answer-✅Newton
/.The unit of acceleration in the SI system is: - Answer-✅m/s2
/.A 15 m long bar is pivoted on the right end and a force of 5 N is applied downwards on
the left end. The moment of force is: - Answer-✅75 Nm counter-clockwise
/.The unit of measure for a ______of force is the Newton meter. - Answer-✅moment
/.Which If a system is in equilibrium, then which of the following statements is true? -
Answer-✅The system will not rotate because the moments in the system balance each
other out
Test Practice Questions With Correct
Marking Scheme
/.Any action on a body, which tends to change its size, shape or its state of motion is
defined as: - Answer-✅force
/.Energy is the ability of a body to do work by virtue of its position. - Answer-✅Potential
/.A body travels 163 m in 6 seconds. What is the velocity? - Answer-✅27.166 m/s
/.Which of the following is an example of a static body? - Answer-✅a rigid body that is
at rest.
/.A bar is pivoted on the right end and a force is applied downwards on the left end. The
rotation of the bar will be: - Answer-✅counter-clockwise
/.If a system of forces is in equilibrium, then which of the following statements is true? -
Answer-✅The total forces to the right = the total forces to the left.
/.A 5 m long bar is pivoted on the right end and a force of 10 N is applied upwards on
the left end. The moment of force is: - Answer-✅50 Nm clockwise
/.An effort of 3 kN is required to move a mass of 2,000 kg in a certain simple machine.If
the mass is raised 1.5 m while the effort moves 12 m, find:
the velocity ratio (VR)
the actual mechanical advantage (MA)
and the efficiency (EFF) of the machine. - Answer-✅8, 6.54, 81.75
/.A simple wheel and axle has a wheel diameter of 3 m and an axle diameter of 25 cm.
What effort is required to raise 850 kg if the efficiency is 87%? - Answer-✅798.7
/.The ratio of the load to the effort is called: - Answer-✅actual mechanical advantage
/.A simple wheel and axle has a wheel diameter of 2.3 m and an axle diameter of 92
mm. If an effort of 26 N is required to raise a mass of 16 kg, what is the efficiency of the
machine? - Answer-✅24.1
/.Find the magnitude and direction of 4 concurrent coplanar forces:
,i) 10 N 32 degrees east of north
ii) 35 N 50 degrees east of north
iii) 25 N 72 degrees east of north
iv) 85 N 40 degrees east of south: - Answer-✅115 N 77 degrees east of south
/.A vector quantity has: - Answer-✅direction, magnitude and necessary units of the
quantity
/.A scalar quantity has: - Answer-✅both magnitude and necessary units
/.Find the magnitude and direction of 3 coplanar forces of:
i) 40 N 45 degrees east of southii) 10 N westiii) 70 N 35 degrees east of north - Answer-
✅65 N 65 degrees east of north
/.A vehicle traveling at 100 km/h decelerate uniformly to 40 km/h in 15 seconds. How far
will the vehicle travel in this time? - Answer-✅291
/.A vehicle that travels 150 km in 3 hours: - Answer-✅has an average speed of 50 km/h
/.The area under a velocity vs. time graph equals: - Answer-✅displacement
/.A body moves 180 degrees from Point A to Point B in a semicircular path. The radius
of the semicircle is 8 m. Calculate the displacement between Point A and Point B: -
Answer-✅16
/.In the SI system, the unit of force is called the Newton (N). One Newton is equal to -
Answer-✅1 kg m/s2
/.What is the kinetic energy possessed by a car, having a mass of 1500 kg and
travelling at a velocity of 50 km/h? - Answer-✅144.7
/.A body with a mass of 88 kg is moving at a velocity of 13.89 m/s. What is its kinetic
energy? - Answer-✅8489
/.The ability to do work due to an object's motion is defined as: - Answer-✅kinetic
energy
/.Regarding the equation μ = FF/RN, which statement is correct: - Answer-✅The values
for FF and RN must be measured at right angles to each other.
/.Find the mass of the refrigerator, which is just started moving by a force of 6,350 N
along a tile floor with a coefficient of friction of 0.30: - Answer-✅2157.66
, /.What are the units associated with "Coefficient of Friction": - Answer-✅there are no
units
/.If engineers require a material which would be able to be stretched and reduced in
cross section without breaking they would choose a material with which of the following
properties? - Answer-✅ductility
/.A unit of stress is: - Answer-✅kPa
/.A hole 3 cm in diameter is to be punched out of a steel plate 8 cm thick. The shear
stress of the material is 670 GPa. What load is required on the punch? - Answer-
✅5051.6
/.A compressive load of 219 kN is resisted by a rectangular strut which has one side
measuring 83 mm. If the stress in the strut is 164,909 kPa, what is the length of the
other side (or width) of the strut? - Answer-✅0.016
/.Idler gears: - Answer-✅are used to reverse rotation
/.In a drive belt system the input to the driver pulley is 265 kW and the output is 211 kW.
What is the efficiency? - Answer-✅79.6
/.A pulley of diameter 2.6 m rotates at 107 r/min and drives a follower pulley at 259
r/min. What is the diameter of the follower pulley? - Answer-✅1.074
/.Which of the following statements about belt drive systems is false? - Answer-
✅Tension in the bottom belt is always double that in the top belt.
/.Which of the following statements is true? if a person pushes with a force of 300 N on
a rock and the rock does not move: - Answer-✅no work was done
/.The unit of force used in the SI system is the: - Answer-✅Newton
/.The unit of acceleration in the SI system is: - Answer-✅m/s2
/.A 15 m long bar is pivoted on the right end and a force of 5 N is applied downwards on
the left end. The moment of force is: - Answer-✅75 Nm counter-clockwise
/.The unit of measure for a ______of force is the Newton meter. - Answer-✅moment
/.Which If a system is in equilibrium, then which of the following statements is true? -
Answer-✅The system will not rotate because the moments in the system balance each
other out
