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Mechanical Engineering Board Exam Questions Part 2

Mechanical Board Exam Questions from Machinery's Handbook.
Topic: Machine Design : Strength of Materials

1.______ is the amount by which a dimension of a body changes when the body is subjected to a load, divided by the original value of the dimension
a. stress
b. unit strain
c. modulus of resilience
d. modulus of elasticity

2.______is the maximum stress to which a test specimen may be subjected and still
return to its original length upon release of the load.
a. elastic limit
b. rupture point
c. yield point
d. elastic limit

3. _______ is the ratio of unit stress to unit strain within the proportional limit of a material in tension or compression.
a. Modulus of Elasticity
b. Modulus of Resilience
c. Strain
d. unit strain

4._______is the ratio of lateral strain to longitudinal strain for a given material
subjected to uniform longitudinal stresses within the proportional limit.
a. Poisson's ratio
b. unit stress
c. strain
d. Young's modulus of elasticity

5._______is the maximum stress that can be applied without permanent deformation of the test specimen.
a.Yield Strength
b. Yield Point
c. Utimate Strength
d. Rupture strength

6. _______ is the ratio of unit stress to unit strain within the proportional limit of a material in shear.
a. Modulus of Elasticity
b. Modulus of Resilience
c. Modulus of Rigidity
d. Young's Modulus

7. When strain cycling is produced by a fluctuating temperature field, the failure process is termed _____.
a. Thermal Fatigue
b. Corrosion Fatigue
c. Surface or Contact Fatigue
d. Creep

8. ______ is the ratio of length l of the column in inches divided by the least radius of gyration r of the cross-section.
a. Poisson's ratio
b. slenderness ratio
c. strain
d. Modulus of elasticity

9.Rankine formula for colunms is also known as...
a. Straight line formula
b. Gordon's Formula
c. secant formula
d. Euler's Formula

10. This is the most widely used of all spring materials for small springs operating at temperatures up to about 250F.
a.Music Wire
b.Oil-Tempered MB Grade
c.Oil-Tempered HB Grade
d.Hard-Drawn MB Grade

11.This general-purpose spring steel is commonly used for many types of coil springs where the cost of music wire is prohibitive and in sizes larger than are available in music wire.
a.Music Wire
b.Oil-Tempered MB Grade
c.Oil-Tempered HB Grade
d.Hard-Drawn MB Grade

12.This grade is used for general-purpose springs where cost is the most important factor.
a.Music Wire
b.Oil-Tempered MB Grade
c.Oil-Tempered HB Grade
d.Hard-Drawn MB Grade

13. This alloy, the first constant-modulus alloy used for
hairsprings in watches, is an austenitic alloy hardened only by cold-drawing and cold-rolling.
d.Ni-Span C

14.This spring service is for 1,000 to 10,000 deflections.
a.Severe Service
b.Light Service
c.Average Service
d.Extra Light Service

15.______ is the highest stress, or range of stress, in pounds per square inch that can be repeated indefinitely without failure of the spring.
a. Endurance Strength
b. Endurance limit
c. Elastic Limit
d. Proportional Limit

More questions to come from Machinery's Handbook. Always visit this site for regular updates or subscribe on a reader or through email.


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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

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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…