480 Important Theory of Machines MCQ Question and Answer | PDF Free Download
1.In which of the following type of gear train the first gear and the last gear are co-axial?
- ASimple gear train
- BCompound gear train
- CReverted gear train
- DNone of the above
2.The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
- AGreater than
- BLess than
- CEqual to
- DNone of these
3.Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?
- AD-slide valve
- BGovernor
- CFlywheel
- DMeyer's expansion valve
4.The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line
- AJoining the corresponding points
- BPerpendicular to line as per (A)
- CNot possible to determine with these data
- DAt 45° to line as per (A)
5.The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as
- ATurning pair
- BRolling pair
- CSliding pair
- DSpherical pair
6.The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as
- ASpur gearing
- BHelical gearing
- CBevel gearing
- DSpiral gearing
7.In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
- Ax₁/x₂
- Blog(x₁/x₂)
- Cloge(x₁/x₂)
- Dlog(x₁.x₂)
8.In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
- A0.2
- B0.4
- C0.6
- D0.8
9.Rectilinear motion of piston is converted into rotary by
- ACross head
- BSlider crank
- CConnecting rod
- DGudgeon pin
10.The method of direct and reverse cranks is used in engines for
- AThe control of speed fluctuations
- BBalancing of forces and couples
- CKinematic analysis
- DVibration analysis
11.The gear train usually employed in clocks is a
- ASimple gear train
- BReverted gear train
- CSun and planet gear
- DDifferential gear
12.Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular speed = (ω₁ + ω₂)/2]
- AI.ω.(ω₁ - ω₂)
- BI.ω².CS
- C2.E.CS
- DAll of these
13.The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because
- AWhole of the mechanism in the Ackerman steering gear is on the back of the front wheels
- BThe Ackerman steering gear consists of turning pairs
- CThe Ackerman steering gear is most economical
- DBoth (A) and (B)
14.In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines
- AThe algebraic sum of the primary forces must be equal to zero
- BThe algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
- CBoth (A) and (B)
- DNone of these
15.In order to give a complete secondary balance of a multi-cylinder inline engine
- AThe algebraic sum of the secondary forces must be equal to zero
- BThe algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
- CBoth (A) and (B)
- DNone of these
16.The pair is known as a higher pair, when the relative motion between the elements of a pair is
- ATurning only
- BSliding only
- CRolling only
- DPartly turning and partly sliding
17.The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the center of gravity is equal to the radius of gyration of the body about its center of gravity.
- AZero
- BMinimum
- CMaximum
- DNone of these
18.Which of the following property of the instantaneous center is correct?
- AA rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.
- BThe two rigid links have no linear velocity relative to each other at the instantaneous centre.
- CThe velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
- DAll of the above
19.A Hartnell governor is a
- ADead weight governor
- BPendulum type governor
- CSpring loaded governor
- DInertia governor
20.In higher pair, the relative motion is
- APurely turning
- BPurely sliding
- CPurely rotary
- DCombination of sliding and turning