Power Engineering 4th Class - Unit A1 Review Exam 2025 Questions and Answers

Power Engineering 4th Class - Unit A1
Review Exam 2025 Questions and
Answers


(4-011-1.3) A wheel and axle has a mechanical advantage of 10. Calculate the diameter of the axle if

the diameter of the wheel is 30cm.

Select one:

a. 3 cm

b. 3.3 cm

c. 6 cm


d. 15 cm - CORRECT ANSWER✔️✔️-a


(4-014-3.4) A 68.5kg object is at rest at a height of 65m above the earth's surface. What is its kinetic

energy?

Select one:

a. 4.45 kJ

b. 4.37 kJ




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,c. 34.25 kJ


d. 0 kJ - CORRECT ANSWER✔️✔️-d


(4-013-2.1) A car accelerates uniformly from rest to 6.1 m/s in 40 seconds. It continues at this

velocity for an additional 60 seconds. Then it decelerates to a stop in 10 seconds. If the car traveled

in a straight line during this time, determine the final distance from its original position.

Select one:

a. 671 m

b. 9.15 m

c. 518.5 m


d. 122 m - CORRECT ANSWER✔️✔️-c


(4-016-2.4) The ratio between the ultimate strength and the allowable stress is called the:

Select one:

a. Ultimate stress

b. Maximum allowable load

c. Working stress


d. Safety factor - CORRECT ANSWER✔️✔️-d


(4-009-2.9) A uniformly applied force, acting at right angles to a surface, divided by the surface area,

is defined as:

Select one:



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,a. Acceleration

b. Pressure

c. Weight


d. Surface area - CORRECT ANSWER✔️✔️-b


(4-014-1.1) The capacity of a body to do work is defined as:

Select one:

a. Energy

b. Power

c. Pressure


d. Force - CORRECT ANSWER✔️✔️-a


(4-009-2.4) The unit of measure for work in the SI system is:

Select one:

a. Newtons

b. Joules

c. Kilowatts


d. Foot pounds - CORRECT ANSWER✔️✔️-b


(4-010-1.3) Which of the following statements about force is FALSE?

Select one:




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, a. Force is the push exerted on a body.

b. Force may make a body move.

c. Force is the pull exerted on a body.


d. No force is required to stop a body's motion. - CORRECT ANSWER✔️✔️-d


(4-012-1.7) Displacement is:

Select one:

a. A vector quantity

b. A scalar quantity

c. Measured by the actual path the object travels


d. How far an object has moved - CORRECT ANSWER✔️✔️-a


(4-014-1.4) A simple machine is required to raise 1 tonne of stones a vertical distance of 30m. If the

efficiency of the pulley is 100%, how much work must be done on the pulley to raise the stone?

Select one:

a. 294.3 J

b. 30 kJ

c. 35 kJ


d. 294.27 kJ - CORRECT ANSWER✔️✔️-d


(4-010-2.8) A 5m long bar is pivoted on the right end and a force of 10N is applied upwards on the

left end. The moment of force is:


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