Engineering Mechanics – Free PSC Quiz (16)

 Free PSC Quiz for civil engineers (Topic: Engineering Mechanics):

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1. A flywheel is rotating at 100 rpm and after 5 seconds it rotates at 150 rpm. The initial and final angular velocity respectively is

 3πand 5.33 π

 5.33πand 3π

 3.33 π and 5π

 5π and 3.33 π

2. A lift has an upward acceleration of 1m/s2.What is the pressure exerted by a man weighing 500N on the floor of lift?

 55N

 500 N

 550 N

 50N

3. An object of mass 1kg is rotated in horizontal circle of radius 1m length at an angular velocity 5rad/sec. The centripetal acceleration is

 12.5 m/s2

 6.25 m/s2

 32.5 m/s2

 25 m/s2

4. The efficiency of lifting machine is given by

 Mechanical advantage /Velocity Ratio

 Mechanical advantage * Velocity Ratio

 VR/MA

 Load /VR

5. The ratio of ideal effort to actual effort of a screw jack gives

 Efficiency

 Velocity ratio

 Mechanical advantage

 Input

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