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Mechanical Review: Power Elements Part 4

Here's the 4th installment of mechanical engineering review questions on Power and Industrial plant engineering.

Choose the BEST answer.

1. A term referring to the process of clearing exhaust gases by forcing into it a current of air which provides clean air for the next compression stroke of the engine.
a. Scavenging
b. Turbo charging
c. Doping
d. Ventilation

2. The process regulating air supply either by mechanical or natural means.
a. Air conditioning
b. Turbo charging
c. Ventilation
d. Scavenging

3. A large pipe or drum into which a group of boiler is connected.
a. leader
b. header
c. kiln
d. liquid receiver

4. An ideal gas undergoes an isothermal compression, the enthalpy therefore,
a. Increases
b. Decreases
c. Increases then decreases
d. Remain the same

5. The speed of the turbine in a medium head hydroelectric power plant is regulated by…
a. Nozzle
b. Forebay
c. Deflector gate
d. Wicket gate

6. Which of the following is NOT a unit measure of viscosity
a. SSU
b. Centipoises
c. Redwood
d. Degree Baume

7. Energy from the random motion of molecules within the body
a. Kinetic energy
b. Temperature
c. Heat
d. Chemical energy

8. Term referring to the ignition of air fuel mixture in the intake of the exhaust manifold
a. Backfire
b. Fire point
c. Flash point
d. Detonation

9. The amount of matter containing the Avogadro’s number of particles (molecule or atoms).
a. gram
b. Mole
c. Molecular mass
d. Atomic mass

10. Internal combustion engine works on the following engines EXCEPT
a. Diesel
b. Otto
c. Dual combustion
d. Rankine

Answers will be posted here after 3 days.


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Past Mechanical Engineering Board Exam Question Number 1
A 4 inches diameter short shaft carrying 2 pulleys close to the bearings transmits how much horsepower if the shaft makes 120 rpm.

A.200HP               B. 199 HP

C.198 HP              D. 202 HP

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Past Mechanical Engineering Board Exam Question Number 2
An instrument that measures the hardness of the work piece in terms of elasticity.

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Source: Machinery’s Handbook


Here are the solutions to board problems given at Power Subject Set-1. If you do not understand anything, feel free to write a comment voicing out your concern. I'm still looking for better ways to present my solution. I still don't know how to present equations and mathematical symbols with blogger. Please bear with me.

1. An automobile tire is inflated to 32psig pressure at 50 degree F. After being driven, the temperature rises to 75 degree F. Determine the final gage pressure assuming the volume remains constant. (Electrical Engineering Board Exam Problem)

Since volume is constant, use Charles’ Law on constant volume processes.
Note: P and T should be absolute.

(32+14.7)/ (50+460) =P2/ (75+460)

P2=48.99 psia

Converting back to gage pressure,


P2g=34.29 psig

2. Four hundred cubic centimeters of gas at a pressure of 740 mmHg absolute and temperature of 18 degree C undergoes a process until the pressure and temperature becomes 760 mmHg abso…