Deck 8: Mechanical Engineering: Cam Size, Transmission Losses, Kleins Construction

Question 1

Cam size depends upon

A)Pitch cricle
B)Cam operating speed
C)Base circle
D)Outer circle
E)Prime circle

Answer 1

C

Question 2

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

A)Direct gear
B)Third gear
C)Second gear
D)First gear
E)Sperm

Answer 2

A

Question 3

Klein's construction is used to determine

A)Displacement of various parts
B)Velocity of various parts
C)Acceleration of various parts
D)Angular acceleration of various parts
E)None of the above

Answer 3

C

Question 4

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

A)6.67 m/s
B)Zero
C)8.33 m/s
D)3.33 m/s
E)2 m/s

Question 5

Which of the following road offers maximum resistance to automobiles?

A)Loose sand
B)Well rolled gravel
C)Wood paving
D)Macadam
E)Sperm

Question 6

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

A)Durograph
B)Graphometer
C)Pantograph
D)Clinograph
E)Trisquare

Question 7

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

A)flat collar bearing
B)conical pivot bearing
C)truncated conical pivot bearing
D)None of the above
E)None of the above

Question 8

Froude's dynamometer is

A)Torsion dynamometer
B)Fan type dynamometer
C)Vortex type hydraulic dynamometer
D)Mechanical friction type dynamometer
E)Transmission type of dynamometer

Question 9

In vibration analysis 'Beat' frequency is

A)The frequency at which vibrations of a system are damped
B)Said to occur when two vibrations of almost equal frequency are present
C)The frequency when a system exceeds the vibrations frequency from the critical value
D)The frequency below which vibrations do not cause appreciable damage to equipment
E)One at which the vibrations of a system act exactly opposite to the other thereby causing damping

Question 10

In case of Scotch Yoke Mechanism the Coriolis component is

A)Involved but generally neglected
B)Not involved
C)Involved if some other conditions are satisfied
D)Sometimes involved
E)Involved

Question 11

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

A)26 cps
B)21 cps
C)6 cps
D)16 cps
E)11 cps

Question 12

A vibrating system is said to be stable if

A)The amplitude of vibration decreases with time
B)The amplitude of vibration does not change with time
C)Only transient increases indefinitely with time
D)The total energy in the system does not change with time
E)None of the above

Question 13

The cam angle is

A)The angle of rotation of the cam for a definite displacement of the follower
B)Angle subtended by live portion of cam at the cam centre
C)The angle subtended at the cam centre by the portion of cam during which the follower moves
D)The angle subtended by the cam at the cam centre when the follower dwells
E)None of the above

Question 14

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

A)2
B)4
C)5
D)7.5
E)None of the above

Question 15

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

A)Helical gears
B)Worm and worm wheel
C)Differential system
D)Bevel gears
E)Simple gear train

Question 16

Which of following gear system have minimum axial thrust?

A)Double helical gears
B)Bevel gears
C)Spur gears
D)Helical gears
E)Miter gears

Question 17

In Iocomotives, swaying couple is caused due to

A)Unbalanced part of the secondary forces acting at a distance between the line of stroke of the cylinders
B)Vertical unbalanced primary forces acting in the plane of the wheels
C)Vertical unbalanced primary forces acting in the plane of the wheels
D)Unbalanced parts of the primary forces acting at a distance between the line of stroke of the cylinders
E)Horizontal unbalanced primary forces acting in the plane of the wheel

Question 18

A governor is said to be isochronous when

A)The equilibrium ball radii is constant for a given speed
B)For each speed within the working range the ball weights occupy a definite specific position
C)There is only one radius of the governor weights for each equilibrium sped
D)There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range
E)None of the above

Question 19

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

A)Become more sensitive
B)Become less sensitive
C)Remain unaffected as far sensitivity is concerned
D)Start hunting (E) Become isochronous
E)21 cps

Question 20

In taper roller bearing the contact angle is

A)Between 12° and 15°
B)Between 15° and 20°
C)Between 1° and 3°
D)Between 5° and 10°
E)Zero

Question 21

Which of the following is a sliding pair?

A)Bolt and nut
B)Ball and socket joint
C)Belt and pulley
D)Cross-head and guides
E)None of the above

Question 22

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

A)15 kg
B)18.35 kg
C)11 kg
D)18.65 kg
E)16.5 kg

Question 23

The speed of gas turbine is usually

A)Same as natural frequency of vibrations
B)Below the natural frequency of vibrations
C)Well above the natural frequency of vibrations
D)Not connected with natural frequency of vibrations
E)None of the above

Question 24

The direction of Corioli's component of acceleration is

A)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
B)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
C)The direction of relative velocity vector for the two coincidental points in the direction directly opposite to that of angular velocity
D)The direction at right angles to that of relative angular velocity vector
E)None of the above