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Engineering Mechanics QUESTIONS AND ANSWERS

Mechanical Engineering : Engineering Mechanics QUESTIONS AND ANSWERS :: part3 : 16 to 20

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

16.71. The ratio of limiting friction and normal reaction is known as

coefficient of friction

angle of friction

angle of repose

sliding friction

friction resistance.

17.81. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella

more inclined when moving

less inclined when moving

more inclined when standing

less inclined when standing

none of the above.

18.78. Pick up wrong statement about friction force for dry surfaces. Friction force is

proportional to normal load between the surfaces

dependent on the materials of contact surface

proportional to velocity of sliding

independent of the area of contact sur-faces

none of the above is wrong statement.

19.65. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, - ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

20 kg, - ve sense

20 kg, + ve sense

10 kg, + ve sense

10 kg, - ve sense

45 kg, + ve sense.

20.The effort required to lift a load W on a screw jack with helix angle a and angle of friction

Wtan(a + <)>)

Wtan(a-<)>)

Wcos(a + )

Wsin(a + <(>)

W (sin a + cos ).

More Engineering Mechanics QUESTIONS AND ANSWERS available in next pages