Deck 1: Mechanical Engineering Concepts

Question 1

The advantages of involute profile over cycloidal are given below. Identify if there is any incorrect statement

A)In the involute system, the pressure angle is constant, from commencement to end of engagement
B)The vriation in the centre distance with in limits does not affect the two mating gears in the involute system
C)The straight teeth of the basic rank for the involute profile admits of simple tools
D)The interference is inherently absent in this system
E)The profile for the flank and face is a single curve in the involute system

Answer 1

The interference is inherently absent in this system

Question 2

A reverted gear train is one is which

A)The direction of rotation of first and last gear is the same
B)The firection of rotation of first and the last gear is opposite
C)The first and last gear are on the same shaft
D)The first and last gear are essentially on separate but parallel shafts
E)None of the above

Answer 2

The first and last gear are on the same shaft

Question 3

Slip in turning belt is

A)Always restricted to 1 percent
B)Less than 5%
C)Zero
D)Depends on the belt material
E)Maximum permissible

Answer 3

Zero

Question 4

The effect of creep in case of cross-belt drive is

A)To increase the power transmitted
B)To increase the speed of driven pulley
C)(A) and (B) above together
D)To reduce the speed of the driven pulley and consequently reduce the power output
E)None of the above

Question 5

A cylindrical type cam is one

A)With circular type motion of follower
B)With cylindrical shape of follower
C)With disc type cam in which the position of the follower is determined by the radial distance from the cam axis.
D)With cricumferential contour cut in the surface of the cylinder which rotates about its axis
E)With cylindrical roller follower

Question 6

A pulley in a belt-drive acts as a

A)sliding pair
B)Cylindrical pair
C)wrapping pair
D)rolling pair
E)Bevel grars

Question 7

In case of cross-helical worm the axes of two shafts are

A)Non-intersecting
B)Parallel
C)Non-parallel-non intersecting
D)Intersecting
E)Non-parallel

Question 8

Ackermann steering gear consists of

A)Turning pair
B)Rolling and sliding pairs
C)Sliding pairs
D)Rolling pairs
E)Sliding and rotary pairs

Question 9

Identify the incorrect statement if any

A)In case of free vibrations the external force is applied at the ends only
B)Damping is resistance to the oscillartion
C)When the frequency of the external exciting force coincides with the natural frequency of the system, state of resonance is reached
D)Forced vibrations are independent of natural frequency of vibration
E)None of the above

Question 10

V-belts with E type cross-section are generally used in

A)Automobiles
B)Small engines
C)When driver and driven units are far off
D)Heavy duty machines
E)None of the above

Question 11

In a cam and follower mechanism, for the uniform velocity of the followers the displacement curve will have

A)No slope
B)Constant slope
C)Slope in positive direction only
D)Slope in both positive and negative direction
E)None of the above

Question 12

Pitch of gears is expressed by

A)Circular pitch
B)Diametral pitch
C)Module
D)Any of the above
E)None of the above

Question 13

Coriolis component is encountered in

A)Slider crank mechanism
B)Four bar chain mechanism
C)Quich return mechanism
D)(A) and (B) above
E)(A) and (C) above

Question 14

The mass moment of inertia is

A)The resistance to angular acceleration
B)The mass of every element of a body multiplied by its distance from the axis
C)Any of the above
D)None of the above
E)Cross-head

Question 15

The number of forks provided in a Hooke's joint is

A)Three
B)Six
C)Two
D)One
E)Four

Question 16

Which of the following gears is free from axial thrust

A)Worm gears
B)Bevel grars
C)Herringbone gears
D)Helical gears
E)Spiral gears

Question 17

In case of hypoid gears the mutual position of shafts will be

A)Non-intersecting
B)Parallel
C)Non-parallel
D)Non-parallel, non-intersecting
E)Intersecting

Question 18

Coriorli's component of acceleration exists whenever a point moves along a path that has

A)Gravitational acceleration
B)Rotational motion
C)Linear displacement
D)Tangential acceleration
E)Centripetal acceleration

Question 19

The spring constant k of a coil-spring is

A)inversely proportional to the square of the number of coils in the spring
B)Sperm
C)directly proportional to the number of coils in the spring
D)inversely proportional to the number of coils in the spring
E)directly proportional to the square of the number of coils in the spring

Question 20

In case of spur gears the profile is

A)Radius that connects the root circle to the profile of the tooth
B)The curve forming face and flank
C)The part of the tooth surface lying below the pitch surface
D)The surface of the top of tooth
E)The width of the gear tooth measured axially along the pitch surface

Question 21

Dynamic of machines deals with

A)The relative motion between the parts, neglecting the consideration of forces
B)The forces acting on the parts of the machine
C)The apparatus for applying mechanical power
D)The number of inter-related parts, each having a definite motion
E)None of the above

Question 22

Klein's construction can be used when

A)Crank has a uniform angular velocity
B)Crank has a uniform angular acceleration
C)Crank has a non-uniform angular velocity
D)(A) and (B) above
E)(A) and (C) above

Question 23

In the elliptical trammel mechanism, the mid-point of the link connecting the two sliders traverses

A)an elliptical path
B)a parobolic path
C)a circular path
D)none of the above
E)None of the above

Question 24

A dadial follower is

A)One that reciprocates in the guides
B)One that oscillates
C)One in which the follower translates along an axis passing through the cam centre of rotation
D)One in which the axis of the following movement is displaced from the cam centre
E)None of the above

Question 25

The pulley in a belt drive acts as

A)Sliding pair
B)Cylindrical pair
C)Turning pair
D)Rolling pair
E)Spherical pair