ইঞ্জিনিয়ারিং মেকানিক্স MCQ
21. The motion of a wheel of a car is-
purely translation
purely rotational
combined translation and rotational
none of these
22. Which of the following is an inversion of four bar chain?
Coupled wheels of locomotive
Whitworth quick return mechanis
Reciprocating air compressor
Hand pump
23. The unit of moment of inertia of an area is-
kg-m²
kg-m-sec²
kg/m^4
m^4
24. 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
25. If the line AB have forward bearing 130° the what is then backward bearing?
50°
220°
310°
30°
26. 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
27. Moment of inertia is the-
second moment of force
second moment of area
second moment of mass
all of these
28. 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
29. 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
30. 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
31. The unit of the radial motion -
m/min
cm/sec
rad/sec
mm/sec
32. Cylindrical roller bearings have greater-
axial load carrying capacity
thrust load carrying capacity
radial load carrying capacity
all of the above
33. The units of moment of inertia of mass are-
kg-m²
m4
kg/m²
kg/m
34. Bull bearing is usually made from-
low carbon steel
high carbon steel
medium carbon steel
chrome steel
35. 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
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. In roller bearings which type of rolling elements are used?
Cylindrical rollers
Taper rollers
Spherical rollers
All of the above
38. 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
39. The velocity of a particle coming from a height 'h' is -
2√(gh)
√(gh)
√ (2gh)
2g√h
40. In which power transmitting drive polygon effect is observed?
Belt drive
Chain drive
Both ক andখ
None of the above