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Engineering Mechanics
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Question
Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then
Options
A. their algebraic sum is zero
B. their lines of action are at equal distances
C. the algebraic sum of their moments about any point in their plane is zero
D. the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
Correct Answer
the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
More questions
1. Tungsten when added to steel __________ the critical temperature.
Options
A. does not effect
B. lowers
C. raises
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Correct Answer: raises
2. The unit of surface tension is
Options
A. N/m
B. N/m
2
C. N/m
3
D. N-m
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Correct Answer: N/m
3. When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
Options
A. lower pair
B. higher pair
C. self-closed pair
D. force-closed pair
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Correct Answer: lower pair
4. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
Options
A. delivers unit discharge under unit head
B. delivers unit discharge under unit speed
C. develops unit power under unit head
D. develops unit power under unit speed
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Correct Answer: develops unit power under unit head
5. The torsional rigidity of a shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft.
Options
A. True
B. False
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Correct Answer: True
6. Metal patterns are used for
Options
A. small castings
B. large castings
C. complicated castings
D. large scale production of castings
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Correct Answer: large scale production of castings
7. Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
Options
A. Silicon
B. Sulphur
C. Manganese
D. Phosphorus
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Correct Answer: Silicon
8. When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.
Options
A. Right
B. Wrong
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Correct Answer: Wrong
9. A beam of
T
-section is subjected to a shear force of
F
. The maximum shear force will occur at the
Options
A. top of the section
B. bottom of the section
C. neutral axis of the section
D. junction of web and flange
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Correct Answer: neutral axis of the section
10. Bernoulli's equation is applied to
Options
A. venturimeter
B. orifice meter
C. pitot tube
D. all of these
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Correct Answer: all of these
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