Deck 2: Mechanical Engineering Shafts, Belts, Gears, and Governors

Question 1

A shaft having one end fixed has a disc oscillating freely at the other end. If the shaft stiffness, increases the natural frequency of vibrations will

A)Increase
B)Decrease
C)There will be no effect
D)Will depend on the stiffness of the disc
E)None of the above

Answer 1

A

Question 2

If a machine uses four V belts, while purchasing care should be taken to ensure that

A)All belts are same section
B)All belts are of same batch number
C)All belts are of same size
D)All belts are of same manufacturers
E)All above

Answer 2

All belts are of same batch number

Question 3

In case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when

A)Half of the reciprocating masses are balanced by rotating masses
B)1/2 of the reciprocating mass are balanced by equivalent rotating mass
C)More than half of the reciprocating masses are balanced by rotating masses
D)Reciprocating masses are balanced half by equivalent opposite reciprocating masses and the balance by rotating masses
E)None of the above

Answer 3

A

Question 4

Which of the following is a higher pair?

A)A shaft revolving in a bearing
B)Piston reciprocating inside the cylinder
C)Automobile steering gear
D)Ball and socket
E)None of the above

Question 5

The vibrations in which the restoring forces are not proportional to the displacements and the first power of velocity are known as

A)Bearing vibrations
B)Over damped vibrations
C)Torsional vibrations
D)Non-linear vibrations
E)Under damped vibrations

Question 6

If a particle of a link has a velocity when changes both in magnitude and direction at any instant, then

A)It must have three components of acceleration e.g. centripetal, centrifugal and gravitational
B)It must have two components of acceleration e.g. centripetal, and tangential
C)It must have three components of acceleration e.g. centripetal centrifugal and tangential
D)It must have four components of acceleration e.g. centripetal, centrifugal gravitational and tangential
E)It must have only unidirectional acceleration

Question 7

Which of the following oil has highest specific gravity?

A)Turpentine
B)Diesel
C)Castor oil
D)Petrol
E)Sperm

Question 8

In case of involute gears

A)Interference is inherently absent
B)A convex flank is always in contact with concave flank
C)Variation in centre distance of shafts increases radial force
D)Pressure angle is constant throughout the teeth engagement
E)None of the above

Question 9

The rotor of a ship rotates in anticlock wise direction when viewed from the bow end and the ship takes a left turn. The effect of gyroscopic couple on the ship is

A)to lower the bow and raise the stern
B)to raise the bow and lower then stern
C)to roll the ship slightly clockwise when viewed fro bow end
D)None of the above
E)None of the above

Question 10

In case of gears, the module is

A)The length of the pitch circule diameter per tooth
B)The number of teeth per unit length on pitch circle diameter
C)The pistance measured along the pitch circle from a point on one tooth to a corresponding point on the adjacent point
D)Any of the above
E)None of the above

Question 11

Hammer blow in locomotives results in

A)Variable horizontal force
B)Tendency to lift wheel from rails
C)Uniform torque
D)Pulsating torque
E)Uneven speed

Question 12

In Iocomotive operation, the swaying couple results due to

A)Primary disturbing force
B)Use of double acting cylinders
C)Hammer blow
D)Use of two cylinders
E)High speeds

Question 13

Which of the following is a centrifugal type governor?

A)Watt governor
B)Hartnell governor
C)Porter governor
D)All of the above
E)None of the above

Question 14

The maximum efficiency of a screw jack provided with square threads and angle of friction 30? will be

A)47.50%
B)60%
C)25%
D)33%
E)50%

Question 15

A governor is said to be stable when

A)There is one radius of the governor weights for each equilibrium speed
B)There is minimum change of the radius of the governor weights at a operating speed
C)The position of balls does not change within the operating speed
D)The position of balls changes within permissible limits within the working range of a governor
E)None of the above

Question 16

Klien's construction gives graphical construction for

A)Both of above
B)Acceleration polygon
C)Slider-crank mechanism
D)Velocity polygon
E)Four bar chain mechanism

Question 17

Can simple band brake be made self-energising type

A)No
B)Yes, but with require several modifications
C)Will not be economical
D)Yes
E)Yes, but with few limitations

Question 18

For speed reduction in the ratio of 100 the type of gear preferred is

A)Spur gear
B)Worm and worm wheel
C)Bevel gear
D)Hypoid gear
E)Helical gear

Question 19

The moment of friction with the assumption of uniform wear to uniform pressure is

A)Same
B)Greater
C)Lower
D)(A) and (B) above
E)(A) and (C) above

Question 20

The type of governor used in record players for adjusting the speed of turn table generally is

A)Porter governor
B)Proell governor
C)Hartung governor
D)Simple Watt's governor
E)Pickering governor

Question 21

A belt drive is

A)A positive drive
B)Not a positive drive
C)Meant for small torque transmission only
D)Used only when the two pulleys have parallel axis
E)None of the above

Question 22

The engine of an aeroplane rotates in a clockwise direction when seen from the tail end and the aeroplane takes a turn torwards left. The effect of gyroscopic couple on aeroplane is

A)to raise the nose and dip the tail
B)to dip the nose and raise the tail
C)to roll the aeroplane slightly in the clockwise direction when viewed from tail end
D)None of the above
E)None of the above

Question 23

A V belt designated as C 3048/120 will have

A)Approximately 120 inch inside length
B)Approximately 120 cm inside length
C)C section, length unspecified
D)Width 120 mm
E)None of the above

Question 24

A cycle chain is a kinematic chain

A)Yes
B)No
C)Yes, provided the links are limited in number
D)Yes provided the distance is limited
E)None of the above

Question 25

A kinematic chain must have at least

A)Four links and two turning pairs
B)Four links and four turning pairs
C)Four links and five turning pairs
D)Two links and two turning pairs
E)Three links and two turning pairs