ইঞ্জিনিয়ারিং মেকানিক্স MCQ
21. The units of moment of inertia of mass are-
kg-m²
m4
kg/m²
kg/m
22. In which power transmitting drive polygon effect is observed?
Belt drive
Chain drive
Both ক andখ
None of the above
23. In roller bearings which type of rolling elements are used?
Cylindrical rollers
Taper rollers
Spherical rollers
All of the above
24. The CG of a right circular solid cone of height h lies at the following distance from the base-
h/2
J/3
h/6
h/4
25. The unit of the radial motion -
m/min
cm/sec
rad/sec
mm/sec
26. Which of the following is the locus of 25 a point that moves in such a manner that its distance from a fixed point is equal to its distanc from a fixed line multiplied by a constant greater than one-
Ellipse
Hyperbola
Parabola
Circle
27. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be-
r/2
2r/3
r/A
3r/2
28. The polar moment of inertia of a solid circular shaft of diameter (D) is-.
πD^3/16
πD^3/32
πD^4/32
πD^4/64
29. The CG of a plane lamina will not be at its geometrical centre in the case of a-
Right angled triangle
Equilateral triangle
Square
square
30. The velocity of a particle coming from a height 'h' is -
2√(gh)
√(gh)
√ (2gh)
2g√h
31. If the line AB have forward bearing 130° the what is then backward bearing?
50°
220°
310°
30°
32. Which of the following is an inversion of four bar chain?
Coupled wheels of locomotive
Whitworth quick return mechanis
Reciprocating air compressor
Hand pump
33. Moment of inertia is the-
second moment of force
second moment of area
second moment of mass
all of these
34. The motion of a wheel of a car is-
purely translation
purely rotational
combined translation and rotational
none of these
35. Cylindrical roller bearings have greater-
axial load carrying capacity
thrust load carrying capacity
radial load carrying capacity
all of the above
36. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly-
38m
62.5m
96m
124m
37. Bull bearing is usually made from-
low carbon steel
high carbon steel
medium carbon steel
chrome steel
38. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to-
25
50
100
250
39. The unit of moment of inertia of an area is-
kg-m²
kg-m-sec²
kg/m^4
m^4
40. A compressor is driven by a motor and flat belt without any slip, diameter of the motor pulley is 15cm, motor pulley rpm is 1440, compressor rpm is 600. Diameter of the compressor pulley is-
60cm
42cm
36cm
28cm