Online Mechanical Engineering Test - Theory of Machines Test 2

Instruction:

This is a FREE online test. Beware of scammers who ask for money to attend this test.
Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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All the best!

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

sliding

turning

rolling

screw

[#]

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

0° and 90°

0° and 180°

90° and 180°

180° and 360°

[#]

The factor which affects the critical speed of a shaft is

diameter of disc

span of shaft

eccentricity

all of these

[#]

Which of the following is a higher pair?

Belt and pulley

Turning pair

Screw pair

Sliding pair

[#]

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

Agree

Disagree

[#]

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

radial component only

tangential component only

coriolis component only

radial and tangential components both

[#]

The unbalanced primary forces in a reciprocating engine are

balanced completely

balanced partially

balanced by secondary forces

not balanced

[#]

The lower pairs are __________ pairs.

self-closed

force-closed

[#]

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)

P = W tan α

P = W tan (α + φ)

P = W (sin α + μ cos α)

P = W (cos α + μ sin α)

[#]

10.

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

flat pivot bearing

flat collar bearing

conical pivot bearing

truncated conical pivot bearing

[#]

11.

A watt's governor can work satisfactorily at speeds from

60 to 80 r.p.m.

80 to 100 r.p.m.

100 to 200 r.p.m.

200 to 300 r.p.m.

[#]

12.

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

Correct

Incorrect

[#]

13.

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

Correct

Incorrect

[#]

14.

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

True

False

[#]

15.

A shaft of mass (m_c)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.

Yes

[#]

16.

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,

Yes

[#]

17.

A sliding pair has a completely constrained motion.

Yes

[#]

18.

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

Correct

Incorrect

[#]

19.

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

radial component only

tangential component only

coriolis component only

radial and tangential components both

[#]

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)