Saturday, November 14, 2009

PAST MECHANICAL BOARD EXAM QUESTION: Machine Design Set-1






The questions below are BASED on the past board examinations given by the board of mechanical engineering. Also, please take note that some of the questions are intentionally varied for the purpose of improving them. Answers (and probably the solutions) will be given a few days after.



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

Past Mechanical Engineering Board Exam Question Number 2
An instrument that measures the hardness of the workpiece in terms of elasticity.
a. Durometer
b. Scleroscope
c. Mohs's Scale
d. Brinell Tester

Past Mechanical Engineering Board Exam Question Number 3
A cylindrical tank with 15 in inside diameter contains oxygen gas at 3000 psi. Calculate the required wall thickness in (mm) under stress of 25,000 psi.
A.11.44mm               B. 22.86mm
C.15.36mm               D. 15.86mm

Past Mechanical Engineering Board Exam Question Number 4
The minimum clearance allowed for meshing spur gears with a circular pitch of 0.1571 and diametral pitch of 20. The spur gear have 25 teeth.
A. 0.003578             B. 0.007855
C. 0.007558             D. 0.007585

Past Mechanical Engineering Board Exam Question Number 5
SAE steel that responds to heat treatment:
A.SAE 1060                  B.SAE 1030
C.SAE 1117                  D.SAE 1020

Past Mechanical Engineering Board Exam Question Number 6
The differential of the shear equation is which one of the following:
A. load of the beam                         B. slope of the elastic curve
C. bending moment of the beam       D. tensile strength of the beam

Past Mechanical Engineering Board Exam Question Number 7
To reduce cost in the manufacturing of large worm gears the materials to utilize:
A. alloyed aluminum rim with cast iron spider
B. bronze rim with cast steel spider
C. cast iron rim with bronze spider
D. all of these



Past Mechanical Engineering Board Exam Question Number 8
The _____ test is used for determining the hardness of metallic materials consists in applying a known load to the surface of the material to be tested through a hardened steel ball of known diameter.
a. Shore
b. Vicker
c. Brinell
d. Rockwell

Past Mechanical Engineering Board Exam Question Number 9
It is hardening treatment whereby a cast metal is being heated to a very temperature then suddenly subjected to rapid cooling to improve hardenability or resistance is called:
A. normalizing                B. quenching
C. tempering                  D. annealing

Past Mechanical Engineering Board Exam Question Number 10
Determine the estimated weight of an A-36 steel plates size 3/16 x 5 x 15.
A. 515 lbs               B. 625 lbs
C. 485 lbs               D. 575 lbs

Past Mechanical Engineering Board Exam Question Number 11
Split pulley or pulley made of separate section bolted together at the rim, the maximum speed should be limited to about _____% of the maximum speed of solid pulley,
A. 45 to 50%                    B. 65 to 70%
C. 55 to 60%                    D. 80 to 90%

Past Mechanical Engineering Board Exam Question Number 12
Killed steel is very much associated with :
A. manganese            B. phosphorous
C. sulphur                  D. silicon

Past Mechanical Engineering Board Exam Question Number 13
_____is a measure of the ease with which a crack progresses through a material from an existing notch, crack, or sharp corner.
A. Creep Rate
B. Brittleness
C. Notch sensitivity
D. Moh's Scale

Past Mechanical Engineering Board Exam Question Number 14
Calculate the estimated weight of a steel plate size 1/4 x 5 x 8.
A. 480 kg                     C. 100 kg
B. 186 kg                     D. 409 kg

Past Mechanical Engineering Board Exam Question Number 15
A type of welding whereby a wire or powder from the nozzle of a spray gun is fuse gas flame, arc or plasma jet and the molten particles are projected in form of a spray by means of compressed air or gas.
A. electro-slug building               B. plasma-arc welding
C. electro-beam welding            D. metal spray welding

Past Mechanical Engineering Board Exam Question Number 16
Heating of metal above the critical temperature and then cooling slowly usually furnace to reduce the hardness and improve the machinability is called:
A. normalizing                 B. tempering
C. annealing                    D. quenching

Past Mechanical Engineering Board Exam Question Number 17
Accident prevention is:
A. an association of employers, organization and individuals
B. a job of a safety engineer
C. the foreman's responsibility just as much as production
D. the responsibility of top management

Past Mechanical Engineering Board Exam Question Number 18
Major component of bronze casting :
A. copper                   B. zinc
C. manganese             D. lead

Past Mechanical Engineering Board Exam Question Number 19
Commonly utilized/cheapest shaft material available in the market with carbon cont 0.28 to 0.34% C.
A. SAE 4140              B. SAE 1030
C. SAE 1117              D. SAE 4130

Past Mechanical Engineering Board Exam Question Number 20
Continuing changes in dimensions of a stressed material over time is called ____.
A. Aging
B. Embrittlement
C. Creep
D. Deformation

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