480 Important Theory of Machines MCQ Question and Answer | PDF Free Download
1.A rigid body possesses ________degrees of freedom
- AOne
- BTwo
- CFour
- DSix
2.Klein's construction is useful to determine
- AVelocity of various parts
- BAcceleration of various parts
- CDisplacement of various parts
- DAngular acceleration of various parts
3.The factor which affects the critical speed of a shaft is
- ADiameter of disc
- BSpan of shaft
- CEccentricity
- DAll of these
4.For a kinematic chain to be considered as mechanism
- ATwo links should be fixed
- BOne link should be fixed
- CNone of the links should be fixed
- DThere is no such criterion
5.When a point moves along a straight line, its acceleration will have
- ARadial component only
- BTangential component only
- CCoriolis component only
- DRadial and tangential components both
6.When a point at the end of a link moves with constant angular velocity, its acceleration will have
- ARadial component only
- BTangential component only
- CCoriolis component only
- DRadial and tangential components both
7.Sense of tangential acceleration of a link
- AIs same as that of velocity
- BIs opposite to that of velocity
- CCould be either same or opposite to velocity
- DIs perpendicular to that of velocity
8.Idler pulley is used
- AFor changing the direction of motion of the belt
- BFor applying tension
- CFor increasing velocity ratio
- DAll of the above
9.Pulley in a belt drive acts as
- ACylindrical pair
- BTurning pair
- CRolling pair
- DSliding pair
10.Which gear is used for connecting two coplanar and intersecting shafts?
- ASpur gear
- BHelical gear
- CBevel gear
- DNone of the above
11.According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a
- AStraight line
- BParabolic curve
- CTriangle
- DRectangle
12.The power of a Porter governor is equal to
- A[c²/(1 + 2c)] (m + M) g.h
- B[2c²/(1 + 2c)] (m + M) g.h
- C[3c²/(1 + 2c)] (m + M) g.h
- D[4c²/(1 + 2c)] (m + M) g.h
13.In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
- ADepends upon
- BIs independent of
- CEither A or B
- DNone of these
14.The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
- AStructure
- BMachine
- CInversion
- DCompound mechanism
15.Any point on a link connecting double slider crank chain will trace a
- AStraight line
- BCircle
- CEllipse
- DParabola
16.The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)
- Ar sinφ
- Br cosφ
- Cr tanφ
- D(r/2) cosφ
17.Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is
- A(l₁ + l₂ + l₃)/3
- Bl = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³
- Cl = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴
- Dl₁ + l₂ + l₃
18.The Klein's diagram is used when
- ACrank has uniform angular velocity
- BCrank has nonuniform angular velocity
- CCrank has uniform angular acceleration
- DCrank has nonuniform angular acceleration
19.The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is
- AAlong PO
- BPerpendicular to PO
- CAt 45° to PO
- DNone of the above
20.The example of rolling pair is
- ABolt and nut
- BLead screw of a lathe
- CBall and socket joint
- DBall bearing and roller bearing