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Mechanical Engineering Objective Questions { Engineering Mechanics }

253. A machine is said to be irreversible if its efficiency is
B.Less than 50%
D.More than 50%
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254. Pick up the incorrect statement from the following. In case of a suspension bridge if there is a rise in temperature
A.The dip of the cable will increase
B.The length of the cable will increase
C.The dip of the cable will decrease
D.All of the above
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255. If the speed of rotation of earth decreases, the weight of the body will
C.Remain same
D.Increase/decrease depending on range of increase
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256. Two cars are 10 km apart and moving in the same direction at speed of 40 km/hr. A car moving in opposite direction meets these cars at interval of 8 minutes. At what speed the other car is moving
A.75 km/hr
B.60 km/hr
C.45 km/hr
D.35 km/hr
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257. The friction experienced by a body, when in motion, is known as
A.rolling friction
B.dynamic friction
C.limiting friction
D.static friction
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258.  Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity
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259. The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
A.sin θ
B.cos θ
C.tan θ
D.cosec θ
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