# Online Mechanical Engineering Test - Theory of Machines Test 2

Instruction:

• This is a FREE online test. DO NOT pay money to anyone to attend this test.
• Total number of questions : 20.
• Time alloted : 30 minutes.
• Each question carry 1 mark, no negative marks.
• DO NOT refresh the page.
• All the best :-).

1.

In a coupling rod of a locomotive, each of the four pairs is a __________ pair.

A.
 sliding
B.
 turning
C.
 rolling
D.
 screw

2.

The factor which affects the critical speed of a shaft is

A.
 diameter of disc
B.
 span of shaft
C.
 eccentricity
D.
 all of these

3.

The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

A.
 0° and 90°
B.
 0° and 180°
C.
 90° and 180°
D.
 180° and 360°

4.

Which of the following is a higher pair?

A.
 Belt and pulley
B.
 Turning pair
C.
 Screw pair
D.
 Sliding pair

5.

The distance between the centre of suspension and centre of percussion is equal to the equivalent length of a simple pendulum.

A.
 Agree
B.
 Disagree

6.

The unbalanced primary forces in a reciprocating engine are

A.
 balanced completely
B.
 balanced partially
C.
 balanced by secondary forces
D.
 not balanced

7.

When a point at the end of a link moves with constant angular velocity, its acceleration will have

A.
B.
 tangential component only
C.
 coriolis component only
D.

8.

A watt's governor can work satisfactorily at speeds from

A.
 60 to 80 r.p.m.
B.
 80 to 100 r.p.m.
C.
 100 to 200 r.p.m.
D.
 200 to 300 r.p.m.

9.

A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

A.
 P = W tan α
B.
 P = W tan (α + φ)
C.
 P = W (sin α + μ cos α)
D.
 P = W (cos α + μ sin α)

10.

The lower pairs are __________ pairs.

A.
 self-closed
B.
 force-closed

11.

The frictional torque transmitted by a disc or plate clutch is same as that of

A.
 flat pivot bearing
B.
 flat collar bearing
C.
 conical pivot bearing
D.
 truncated conical pivot bearing

12.

The maximum gyroscopic couple acting on the ship tends to shear the holding down bolts.

A.
 Correct
B.
 Incorrect

13.

For the isochronous Porter governor, the controlling force curve is a straight line passing through the origin.

A.
 Correct
B.
 Incorrect

14.

When no external force acts on a body, after giving it an initial displacement, the body is said to have free vibrations.

A.
 True
B.
 False

15.

A shaft of mass (mc)and stiffness (s) is fixed at one end and carries a mass (m) at the other end. The natural frequency of its transverse vibration is same as for longitudinal vibration.

A.
 Yes
B.
 No

16.

A sliding pair has a completely constrained motion.

A.
 Yes
B.
 No

17.

When the connection between the elements forming a pair is such that the constrained motion is not completed by itself, but by some other means, the motion is said to be a completely constrained motion,

A.
 Yes
B.
 No

18.

A pair is said to be a kinematic pair, if the relative motion between them is completely or successfully constrained.

A.
 Correct
B.
 Incorrect

19.

When a point moves along a straight line, its acceleration will have

A.
B.
 tangential component only
C.
 coriolis component only
D.

20.

The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r1 and r2 = External and internal radii of collar respectively)

A.
 μ W (r1 + r2)
B.
 μ W (r1 + r2)
C.
D.