Power Engineering - 4A1 UPDATED ACTUAL Questions and CORRECT
Answers
Question: (4-012-1.9) Coplanar vectors all occur in the same
Correct Answer: a. Plane b. Direction c. Magnitude d. Velocity: a. Plane
Question: (4-015-2.3) Find the mass of the refrigerator that is just started moving by a force of 6350N
along a tile floor with a coefficient of friction of 0.30. a. 2157.66 kg b. 21.2 tonnes c. 1905 kg d. 0.04 g
Correct Answer: a. 2157.66 kg
Question: (4-013-2.4) A car travels a total of 350km. The journey involves a total of 3 hours driving time
and 45 minutes of stop time. What is the average journey speed? a. 93.3 km/h b. 71.7 km/h c. 116.7 km/h d.
107.7 km/h
Correct Answer: a. 93.3 km/h
Question: (4-009-2.2) The rate of doing work is called _________. a. Power b. Kinetic energy c. Potential
energy d. Work
Correct Answer: a. Power
Question: (4-010-2.3) A lever, 10m long, pivots at one end and has a load of 900 kg suspended from the
other end. What upward force must be applied at the midpoint of the lever to obtain equilibrium? a. 8829 N
b. 17 658 N c. 882.9 N d. 4414.4 N
Correct Answer: b. 17 658 N
Question: (4-015-2.1) Find the coefficient of friction between a 73kg cubic box measuring 3m on each side
and a hardwood floor, 16m long and 20m wide, if a force of 236N is required to start the box moving. S a.
0.33 b. 36 N c. 3.20 d. 3.03
Correct Answer: a. 0.33
Question: (4-009-2.5) The product, 'm x g x h', will result in the _______ energy of an object. a. Potential
b. Kinetic c. Maximum d. Minimum
Correct Answer: a. Potential
Question: (4-010-2.2) If a system is in equilibrium, which of the following statements is true? a. The
system will not rotate because the moments in the system balance each other. b. The system will rotate
counter-clockwise. c. The system will not rotate because no force is being exerted. d. The system will rotate
under the largest force.
Correct Answer: a. The system will not rotate because the moments in the system balance each other.
Question: (4-011-1.11) 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
lifted? a. 501.6 kg b. 51.1 kg c. 5113.1 kg d. 250 kg
Correct Answer: b. 51.1 kg
Question: (4-013-2.2) A train starts off from rest and reaches a velocity of 100km/h in 8 minutes. If the
velocity increases uniformly, how far will the train travel during the first 8 minutes? a. 6.67 km b. 7.43 km
c. 8.50 km d. 9.25 km
, Correct Answer: a. 6.67 km
Question: (4-016-2.9) A hollow cylinder with an OD of 100mm and an ID of 30mm, supports a load of
100kN. What is the compressive stress in MPa? a. 11 b. 13.99 c. 15.2 d. 16.34
Correct Answer: b. 13.99
Question: (4-017-1.7) The input to a 93.33% efficient belt drive system is 75kW. What is the output? a. 75
kW b. 70 kW c. 80.36 kW d. 72.5 Watts
Correct Answer: b. 70 kW
Question: (4-016-1.5) If engineers require a material that can be stretched and reduced in cross-section
without breaking, they would choose a material that is
Correct Answer: a. Ductile b. Brittle c. Plastic d. Elastic: a. Ductile
Question: (4-009-2.9) A uniformly applied force, acting at right angles to a surface, divided by the surface
area, is defined as
Correct Answer: a. Acceleration b. Pressure c. Weight d. Surface area: b. Pressure
Question: (4-012-1.1) A single vector that can replace a system of vectors and have the same effect is
called a
Correct Answer: a. Coplanar vector b. Resultant c. Concurrent vector d. Equilibrant: b. Resultant
Question: (4-010-2.4) A 12 m long bar is pivoted on the right end and a force of 150 N is applied upwards
on the left end. The magnitude of the resulting moment of force is
Correct Answer: a. 12.5 Nm b. 25 Nm c. 1.8 kNm d. 1800 kNm: c. 1.8 kNm
Question: (4-013-2.3) An airplane travels 500km due west in 2 hours. Its average velocity was
Correct Answer: a. 250 m/s due west b. 4167 m/s c. 69.4 m/s due west d. 69.4 m/s: c. 69.4 m/s due west
Question: (4-017-2.2) A 28-tooth gear turns at 100 rpm and drives a 112-tooth gear. What is the speed of
the follower gear? a. 400 rpm b. 25 rpm c. 31.36 rpm d. 125.44 rpm
Correct Answer: b. 25 rpm
Question: (4-015-2.7) Find the force required to move a 25kg block along a horizontal floor if the
coefficient of sliding friction is 0.19. a. 4.28 kN b. 4.28 N c. 46.6 N d. 4.66 kN
Correct Answer: c. 46.6 N
Question: (4-015-1.1) To start a body moving, which of the following must be overcome? a. Kinetic
friction b. Static friction c. Fluid friction d. Rolling friction
Correct Answer: b. Static friction
Question: (4-016-int.1) _____________ is the internal resistance to an applied external force. a. Strain b.
Stress c. Ultimate strength d. Load
Correct Answer: b. Stress
Question: (4-009-1.10) A body moves in a straight line at 20m/s. Six seconds later it is moving at 35m/s.
What was the acceleration of the body during that time? a. 9.167 m/s² b. 9.167 m/s c. 0.4 m/s² d. 2.5 m/s²
Correct Answer: d. 2.5 m/s²
Answers
Question: (4-012-1.9) Coplanar vectors all occur in the same
Correct Answer: a. Plane b. Direction c. Magnitude d. Velocity: a. Plane
Question: (4-015-2.3) Find the mass of the refrigerator that is just started moving by a force of 6350N
along a tile floor with a coefficient of friction of 0.30. a. 2157.66 kg b. 21.2 tonnes c. 1905 kg d. 0.04 g
Correct Answer: a. 2157.66 kg
Question: (4-013-2.4) A car travels a total of 350km. The journey involves a total of 3 hours driving time
and 45 minutes of stop time. What is the average journey speed? a. 93.3 km/h b. 71.7 km/h c. 116.7 km/h d.
107.7 km/h
Correct Answer: a. 93.3 km/h
Question: (4-009-2.2) The rate of doing work is called _________. a. Power b. Kinetic energy c. Potential
energy d. Work
Correct Answer: a. Power
Question: (4-010-2.3) A lever, 10m long, pivots at one end and has a load of 900 kg suspended from the
other end. What upward force must be applied at the midpoint of the lever to obtain equilibrium? a. 8829 N
b. 17 658 N c. 882.9 N d. 4414.4 N
Correct Answer: b. 17 658 N
Question: (4-015-2.1) Find the coefficient of friction between a 73kg cubic box measuring 3m on each side
and a hardwood floor, 16m long and 20m wide, if a force of 236N is required to start the box moving. S a.
0.33 b. 36 N c. 3.20 d. 3.03
Correct Answer: a. 0.33
Question: (4-009-2.5) The product, 'm x g x h', will result in the _______ energy of an object. a. Potential
b. Kinetic c. Maximum d. Minimum
Correct Answer: a. Potential
Question: (4-010-2.2) If a system is in equilibrium, which of the following statements is true? a. The
system will not rotate because the moments in the system balance each other. b. The system will rotate
counter-clockwise. c. The system will not rotate because no force is being exerted. d. The system will rotate
under the largest force.
Correct Answer: a. The system will not rotate because the moments in the system balance each other.
Question: (4-011-1.11) 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
lifted? a. 501.6 kg b. 51.1 kg c. 5113.1 kg d. 250 kg
Correct Answer: b. 51.1 kg
Question: (4-013-2.2) A train starts off from rest and reaches a velocity of 100km/h in 8 minutes. If the
velocity increases uniformly, how far will the train travel during the first 8 minutes? a. 6.67 km b. 7.43 km
c. 8.50 km d. 9.25 km
, Correct Answer: a. 6.67 km
Question: (4-016-2.9) A hollow cylinder with an OD of 100mm and an ID of 30mm, supports a load of
100kN. What is the compressive stress in MPa? a. 11 b. 13.99 c. 15.2 d. 16.34
Correct Answer: b. 13.99
Question: (4-017-1.7) The input to a 93.33% efficient belt drive system is 75kW. What is the output? a. 75
kW b. 70 kW c. 80.36 kW d. 72.5 Watts
Correct Answer: b. 70 kW
Question: (4-016-1.5) If engineers require a material that can be stretched and reduced in cross-section
without breaking, they would choose a material that is
Correct Answer: a. Ductile b. Brittle c. Plastic d. Elastic: a. Ductile
Question: (4-009-2.9) A uniformly applied force, acting at right angles to a surface, divided by the surface
area, is defined as
Correct Answer: a. Acceleration b. Pressure c. Weight d. Surface area: b. Pressure
Question: (4-012-1.1) A single vector that can replace a system of vectors and have the same effect is
called a
Correct Answer: a. Coplanar vector b. Resultant c. Concurrent vector d. Equilibrant: b. Resultant
Question: (4-010-2.4) A 12 m long bar is pivoted on the right end and a force of 150 N is applied upwards
on the left end. The magnitude of the resulting moment of force is
Correct Answer: a. 12.5 Nm b. 25 Nm c. 1.8 kNm d. 1800 kNm: c. 1.8 kNm
Question: (4-013-2.3) An airplane travels 500km due west in 2 hours. Its average velocity was
Correct Answer: a. 250 m/s due west b. 4167 m/s c. 69.4 m/s due west d. 69.4 m/s: c. 69.4 m/s due west
Question: (4-017-2.2) A 28-tooth gear turns at 100 rpm and drives a 112-tooth gear. What is the speed of
the follower gear? a. 400 rpm b. 25 rpm c. 31.36 rpm d. 125.44 rpm
Correct Answer: b. 25 rpm
Question: (4-015-2.7) Find the force required to move a 25kg block along a horizontal floor if the
coefficient of sliding friction is 0.19. a. 4.28 kN b. 4.28 N c. 46.6 N d. 4.66 kN
Correct Answer: c. 46.6 N
Question: (4-015-1.1) To start a body moving, which of the following must be overcome? a. Kinetic
friction b. Static friction c. Fluid friction d. Rolling friction
Correct Answer: b. Static friction
Question: (4-016-int.1) _____________ is the internal resistance to an applied external force. a. Strain b.
Stress c. Ultimate strength d. Load
Correct Answer: b. Stress
Question: (4-009-1.10) A body moves in a straight line at 20m/s. Six seconds later it is moving at 35m/s.
What was the acceleration of the body during that time? a. 9.167 m/s² b. 9.167 m/s c. 0.4 m/s² d. 2.5 m/s²
Correct Answer: d. 2.5 m/s²
