480 Important Theory of Machines MCQ Question and Answer | PDF Free Download
1.A rotary internal combustion engine has __________ cylinders.
- AFour
- BFive
- CSix
- DSeven
2.A mechanism consisting of four links is called a __________ mechanism.
- ASimple
- BCompound
- CBinary
- DNone of the
3.Effort of a governor is the
- AMean force exerted at the sleeve for a given percentage change of speed
- BWork-done at the sleeve for maximum equilibrium speed
- CMean force exerted at the sleeve for maximum equilibrium speed
- DNone of the above
4.Power of a governor is the
- AMean force exerted at the sleeve for a given percentage change of speed
- BWork-done at the sleeve for maximum equilibrium speed
- CMean force exerted at the sleeve for maximum equilibrium speed
- DNone of the above
5.Which of the following forms a kinematic link In a reciprocating steam engine?
- ACylinder and piston
- BPiston rod and connecting rod
- CCrankshaft and flywheel
- DFlywheel and engine frame
6.The Coriolis component of acceleration acts
- AAlong the sliding surface
- BPerpendicular to the sliding surface
- CAt 45° to the sliding surface
- DParallel to the sliding surface
7.In a shaper mechanism, the Coriolis component of acceleration will
- ANot exist
- BExist
- CDepend on position of crank
- DNone of the above
8.The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at
- AThe center of the disc
- BThe point of contact
- CAn infinite distance on the plane surface
- DThe point on the circumference situated vertically opposite to the contact point
9.Which of the following statements regarding laws governing the friction between dry surfaces are correct?
- AThe friction force is dependent on the materials of the contact surfaces.
- BThe friction force is directly proportional to the normal force.
- CThe friction force is independent of me area of contact.
- DAll of the above
10.In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is
- AEqual to 1
- BEqual to 2
- CLess than 2
- DGreater than 2
11.For an involute gear, the ratio of base circle radius and pitch circle radius is equal to
- ASinφ
- BCosφ
- CSecφ
- DCosecφ
12.In a four bar chain or quadric cycle chain
- AEach of the four pairs is a turning pair
- BOne is a turning pair and three are sliding pairs
- CTwo are turning pairs and two are sliding pairs
- DThree are turning pairs and one is a sliding pair
13.A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be
- A90 RPM
- B100 RPM
- C80 RPM
- Ddata are insufficient
14.When one of the links of a kinematic chain is fixed, the chain is known as a
- AStructure
- BMechanism
- CInversion
- DMachine
15.The example of completely constrained motion is a
- AMotion of a piston in the cylinder of a steam engine
- BMotion of a square bar in a square hole
- CMotion of a shaft with collars at each end in a circular hole
- DAll of the above
16.The example of successfully constrained motion is a
- AMotion of an I.C. engine valve
- BMotion of the shaft between a footstep bearing
- CPiston reciprocating inside an engine cylinder
- DAll of the above
17.When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a
- AScrew pair
- BSpherical pair
- CTurning pair
- DSliding pair
18.When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a
- AScrew pair
- BSpherical pair
- CTurning pair
- DSliding pair
19.The main disadvantage of the sliding pair is that it is
- ABulky
- BWears rapidly
- CDifficult to manufacture
- DBoth (A) and (B) above
20.The mechanism in which two are turning pairs and two are sliding pairs, is called a
- ADouble slider crank chain
- BElliptical trammel
- CScotch yoke mechanism
- DAll of these