Power Engineering| 4th Class Chap 1-
6 Test Practice Questions With All
Correct Solutions| Approved
Any action on a body, which tends to change its size, shape or its state of motion is defined
as: - Ans--force
__________ energy is the ability of a body to do work by virtue of its position. - Ans--
Potential
A body travels 163 m in 6 seconds. What is the velocity? - Ans--27.166 m/s
Which of the following is an example of a static body? - Ans--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: - Ans--counter-clockwise
If a system of forces is in equilibrium, then which of the following statements is true? - Ans--
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: - Ans--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. - Ans--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%? - Ans--798.7
The ratio of the load to the effort is called: - Ans--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? -
Ans--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: - Ans--115 N 77 degrees east of south
A vector quantity has: - Ans--direction, magnitude and necessary units of the quantity
A scalar quantity has: - Ans--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 - Ans--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? - Ans--291
A vehicle that travels 150 km in 3 hours: - Ans--has an average speed of 50 km/h
The area under a velocity vs. time graph equals: - Ans--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: - Ans--16
In the SI system, the unit of force is called the Newton (N). One Newton is equal to - Ans--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? - Ans--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?
- Ans--8489
The ability to do work due to an object's motion is defined as: - Ans--kinetic energy
Regarding the equation μ = FF/RN, which statement is correct: - Ans--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: - Ans--2157.66
What are the units associated with "Coefficient of Friction": - Ans--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? - Ans--ductility
A unit of stress is: - Ans--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? - Ans--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? - Ans--0.016
Idler gears: - Ans--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? - Ans--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? - Ans--1.074
Which of the following statements about belt drive systems is false? - Ans--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: - Ans--no work was done
The unit of force used in the SI system is the: - Ans--Newton
The unit of acceleration in the SI system is: - Ans--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: - Ans--75 Nm counter-clockwise
The unit of measure for a ______of force is the Newton meter. - Ans--moment
Which If a system is in equilibrium, then which of the following statements is true? - Ans--
The system will not rotate because the moments in the system balance each other out
A block and tackle system has 3 pulleys in each of two blocks. If a downward effort of 100 N
is applied and the machine has an efficiency of 83.6%, what is the maximum mass that can
be moved? - Ans--51.13
A simple machine is one that receives energy by means of a single applied force, and
produces work by means of __________. - Ans--a single output force
A block and tackle system has 6 pulleys in each of two blocks (12 pulleys total). If a
downward effort of 260 N is required to raise a load of 300 kg, calculate the efficiency of the
system. - Ans--94.33
Vectors that are all in the same plane are defined as: - Ans--coplanar
6 Test Practice Questions With All
Correct Solutions| Approved
Any action on a body, which tends to change its size, shape or its state of motion is defined
as: - Ans--force
__________ energy is the ability of a body to do work by virtue of its position. - Ans--
Potential
A body travels 163 m in 6 seconds. What is the velocity? - Ans--27.166 m/s
Which of the following is an example of a static body? - Ans--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: - Ans--counter-clockwise
If a system of forces is in equilibrium, then which of the following statements is true? - Ans--
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: - Ans--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. - Ans--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%? - Ans--798.7
The ratio of the load to the effort is called: - Ans--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? -
Ans--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: - Ans--115 N 77 degrees east of south
A vector quantity has: - Ans--direction, magnitude and necessary units of the quantity
A scalar quantity has: - Ans--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 - Ans--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? - Ans--291
A vehicle that travels 150 km in 3 hours: - Ans--has an average speed of 50 km/h
The area under a velocity vs. time graph equals: - Ans--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: - Ans--16
In the SI system, the unit of force is called the Newton (N). One Newton is equal to - Ans--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? - Ans--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?
- Ans--8489
The ability to do work due to an object's motion is defined as: - Ans--kinetic energy
Regarding the equation μ = FF/RN, which statement is correct: - Ans--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: - Ans--2157.66
What are the units associated with "Coefficient of Friction": - Ans--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? - Ans--ductility
A unit of stress is: - Ans--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? - Ans--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? - Ans--0.016
Idler gears: - Ans--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? - Ans--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? - Ans--1.074
Which of the following statements about belt drive systems is false? - Ans--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: - Ans--no work was done
The unit of force used in the SI system is the: - Ans--Newton
The unit of acceleration in the SI system is: - Ans--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: - Ans--75 Nm counter-clockwise
The unit of measure for a ______of force is the Newton meter. - Ans--moment
Which If a system is in equilibrium, then which of the following statements is true? - Ans--
The system will not rotate because the moments in the system balance each other out
A block and tackle system has 3 pulleys in each of two blocks. If a downward effort of 100 N
is applied and the machine has an efficiency of 83.6%, what is the maximum mass that can
be moved? - Ans--51.13
A simple machine is one that receives energy by means of a single applied force, and
produces work by means of __________. - Ans--a single output force
A block and tackle system has 6 pulleys in each of two blocks (12 pulleys total). If a
downward effort of 260 N is required to raise a load of 300 kg, calculate the efficiency of the
system. - Ans--94.33
Vectors that are all in the same plane are defined as: - Ans--coplanar
