Theory Of Machines Set 8 MCQs

Q1 | Cam size depends upon

Pitch cricle

Cam operating speed

Base circle

Outer circle

Prime circle

Q2 | In a car transmission losses will be least in which gear?

Direct gear

Third gear

Second gear

First gear

Sperm

Q3 | Klein's construction is used to determine

Displacement of various parts

Velocity of various parts

Acceleration of various parts

Angular acceleration of various parts

None of the above

Q4 | A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is perfectly elastic, the velocity of two masses after impact will be

6.67 m/s

Zero

8.33 m/s

3.33 m/s

2 m/s

Q5 | Which of the following road offers maximum resistance to automobiles?

Loose sand

Well rolled gravel

Wood paving

Macadam

Sperm

Q6 | The mechanism used to enlarge or reduce moments for reproducing drawings to different scales is known as

Durograph

Graphometer

Pantograph

Clinograph

Trisquare

Q7 | The frictional torque transmitted by a cone clutch is the same as that of

flat collar bearing

conical pivot bearing

truncated conical pivot bearing

None of the above

Q8 | Froude's dynamometer is

Torsion dynamometer

Fan type dynamometer

Vortex type hydraulic dynamometer

Mechanical friction type dynamometer

Transmission type of dynamometer

Q9 | In vibration analysis 'Beat' frequency is

The frequency at which vibrations of a system are damped

Said to occur when two vibrations of almost equal frequency are present

The frequency when a system exceeds the vibrations frequency from the critical value

The frequency below which vibrations do not cause appreciable damage to equipment

One at which the vibrations of a system act exactly opposite to the other thereby causing damping

Q10 | In case of Scotch Yoke Mechanism the Coriolis component is

Involved but generally neglected

Not involved

Involved if some other conditions are satisfied

Sometimes involved

Involved

Q11 | A 0.5 kg weight attached to a light spring elongates it 0.981 mm. The natural frequency of the system would be approximately

26 cps

21 cps

6 cps

16 cps

11 cps

Q12 | A vibrating system is said to be stable if

The amplitude of vibration decreases with time

The amplitude of vibration does not change with time

Only transient increases indefinitely with time

The total energy in the system does not change with time

None of the above

Q13 | The cam angle is

The angle of rotation of the cam for a definite displacement of the follower

Angle subtended by live portion of cam at the cam centre

The angle subtended at the cam centre by the portion of cam during which the follower moves

The angle subtended by the cam at the cam centre when the follower dwells

None of the above

Q14 | The coefficient of friction between pulley and belt is reduced to half. If the initial ratio of tension in belt is 5, then the new value will be

2

4

5

7.5

None of the above

Q15 | In a system if the speed reduction of 60 : 1 is desired the convenient way is to use

Helical gears

Worm and worm wheel

Differential system

Bevel gears

Simple gear train

Q16 | Which of following gear system have minimum axial thrust?

Double helical gears

Bevel gears

Spur gears

Helical gears

Miter gears

Q17 | In Iocomotives, swaying couple is caused due to

Unbalanced part of the secondary forces acting at a distance between the line of stroke of the cylinders

Vertical unbalanced primary forces acting in the plane of the wheels

Unbalanced parts of the primary forces acting at a distance between the line of stroke of the cylinders

Horizontal unbalanced primary forces acting in the plane of the wheel

Q18 | A governor is said to be isochronous when

The equilibrium ball radii is constant for a given speed

For each speed within the working range the ball weights occupy a definite specific position

There is only one radius of the governor weights for each equilibrium sped

There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range

None of the above

Q19 | In a Hartnell governor if the stiffness of spring is increased the governor will

Become more sensitive

Become less sensitive

Remain unaffected as far sensitivity is concerned

Start hunting (E) Become isochronous

21 cps

Q20 | In taper roller bearing the contact angle is

Between 12? and 15?

Between 15? and 20?

Between 1? and 3?

Between 5? and 10?

Zero

Q21 | Which of the following is a sliding pair?

Bolt and nut

Ball and socket joint

Belt and pulley

Cross-head and guides

None of the above

Q22 | A body having an initial velocity of 10 m/s moves 200 mm in 5 sec when a force of 20 kgf is applied to it. If the acceleration due to gravity is 9 m/s2 the weight of the body should be

15 kg

18.35 kg

11 kg

18.65 kg

16.5 kg

Q23 | Which of the following is not a common section of V-belts

B

F

C

D

E

Q24 | The speed of gas turbine is usually

Same as natural frequency of vibrations

Below the natural frequency of vibrations

Well above the natural frequency of vibrations

Not connected with natural frequency of vibrations

None of the above

Q25 | The direction of Corioli's component of acceleration is

The direction of relative velocity vector for the two coincidental points rotated by 90? in the direction of the angular velocity of the rotation of the link

The direction of relative velocity vector for the two coincidental points rotated by 180? in the direction of the angular velocity of the rotation of the link

The direction of relative velocity vector for the two coincidental points in the direction directly opposite to that of angular velocity

The direction at right angles to that of relative angular velocity vector

None of the above