480 Important Theory of Machines MCQ Question and Answer | PDF Free Download
1.The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)
- Am.ω².r cosθ
- Bc.m.ω².r sinθ
- C(1 - c).m.ω².r (cosθ - sinθ)
- Dm.ω².r (cosθ - sinθ)
2.The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)
- A2π. √(q/I)
- B2π qI
- C(1/2π). √(q/I)
- D1/2π
3.In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be
- A45 mm
- BSlightly less than 45 mm
- CSlightly more than 45 mm
- D95 mm
4.Angular acceleration of a link can be determined by dividing the
- ACentripetal component of acceleration with length of link
- BTangential component of acceleration with length of link
- CResultant acceleration with length of link
- DAll of the above
5.In a ball bearing, ball and bearing forms a
- ATurning pair
- BRolling pair
- CScrew pair
- DSpherical pair
6.The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
- APitch circle
- BBase circle
- CPitch curve
- DPrime circle
7.The sense of Coriolis component 2 ωv is same as that of the relative velocity vector v rotated at
- A45° in the direction of rotation of the link containing the path
- B45° in the direction opposite to the rotation of the link containing the path
- C90° in the direction of rotation of the link containing the path
- D180° in the direction opposite to the rotation of the link containing the path
8.In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as
- ACritical damping ratio
- BDamping factor
- CLogarithmic decrement
- DMagnification factor
9.The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
- ADedendum
- BAddendum
- CClearance
- DWorking depth
10.The angle of inclination of the plane, at which the body begins to move down the plane is called
- AAngle of friction
- BAngle of repose
- CAngle of projection
- DNone of these
11.In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
- A10°-15°
- B15°-25°
- C25°-30°
- D30°-40°
12.In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
- A50°- 60°
- B60°-70°
- C70°- 80°
- D80°- 90°
13.The purpose of a link is to
- ATransmit motion
- BGuide other links
- CAct as a support
- DAll of the above
14.The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.
- ASum
- BDifference
- CProduct
- DRatio
15.In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is
- AEqual to sum of other two
- BGreater than sum of other two
- CLess than sum of other two
- DThere is no such relationship
16.The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)
- Asinφ + sinα = b/c
- Bcosφ - sinα = c/b
- Ccotφ - cotα = c/b
- Dtanφ + cotα = b/c
17.The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)
- Aω² × OQ
- Bω² × OQ sinθ
- Cω² × OQ cosθ
- Dω² × OQ tanθ
18.Whitworth quick return mechanism is obtained by inversion of
- ASlider crank mechanism
- BKinematic chain
- CFive link mechanism
- DRoller cam mechanism
19.A point on a connecting link (excluding end points) of a double slider crank mechanism traces a
- AStraight line path
- BHyperbolic path
- CParabolic path
- DElliptical path
20.Which of the following gear drive is used to obviate axial thrust?
- ADouble helical gears having opposite teeth
- BDouble helical gears having identical teeth
- CSingle helical gear in which one of the teeth of helix angle a is more
- DMutter gears