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.Management Sciences
Category: Engineering Mechanics
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to___________________?
A. 25
B. 50
C. 100
D. 250
E. 500
A number of forces acting at a point will be in equilibrium if_____________________?
A. their total sum is zero
B. two resolved parts in two directions at right angles are equal
C. sum of resolved parts in any two per-pendicular directions are both zero
D. all of them are inclined equally
E. none of the above
The C.G. of a plane lamina will not be at its geometrical centre in the case of a__________________?
A. right angled triangle
B. equilateral triangle
C. square
D. circle
E. rectangle
In the equation of virtual work, following force is neglected_______________________?
A. reaction of any smooth surface with which the body is in contact
B. reaction of a rough surface of a body which rolls on it without slipping
C. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
D. all of the above
E. none of the above
A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve ____________________?
A. catenary
B. parabola
C. hyperbola
D. elliptical
E. circular arc
The unit of power in S.I. units is______________?
A. newton meter
B. watt
C. joule
D. kilogram meter/sec
E. pascal per sec
Coefficient of friction is the_________________?
A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the friction force acting when the body is just about to move
D. the friction force acting when the body is in motion
E. tangent of angle of repose
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be___________________?
A. towards the wall at its upper end
B. away from the wall at its upper end
C. upwards at its upper end
D. downwards at its upper end
E. none of the above
The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
A. Wtan(a + )
B. Wtan(a-)
C. Wcos(a + )
D. Wsin(a + )
E. W (sin a + cos ).
The algebraic sum of moments of the forces forming couple about any point in their plane is_________________?
A. equal to the moment of the couple
B. constant
C. both of above are correct
D. both of above are wrong
E. none of the above
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