Power Engineering - 4A Exam
Questions & Answers (Grade A+)
(4-012-1.9) Coplanar vectors all occur in the same:
a. Plane
b. Direction
c. Magnitude
d. Velocity -
correct answer ✅a. Plane
(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
(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?
,Power Engineering - 4A Exam
Questions & Answers (Grade A+)
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
(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
(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
,Power Engineering - 4A Exam
Questions & Answers (Grade A+)
b. 17 658 N
c. 882.9 N
d. 4414.4 N -
correct answer ✅b. 17 658 N
(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
(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
, Power Engineering - 4A Exam
Questions & Answers (Grade A+)
d. Minimum -
correct answer ✅a. Potential
(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.
(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
Questions & Answers (Grade A+)
(4-012-1.9) Coplanar vectors all occur in the same:
a. Plane
b. Direction
c. Magnitude
d. Velocity -
correct answer ✅a. Plane
(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
(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?
,Power Engineering - 4A Exam
Questions & Answers (Grade A+)
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
(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
(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
,Power Engineering - 4A Exam
Questions & Answers (Grade A+)
b. 17 658 N
c. 882.9 N
d. 4414.4 N -
correct answer ✅b. 17 658 N
(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
(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
, Power Engineering - 4A Exam
Questions & Answers (Grade A+)
d. Minimum -
correct answer ✅a. Potential
(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.
(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
