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

Accepted Answer

Interference can occur in involute gears, especially if the number of teeth is low or if the gear design is not optimized.

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

Accepted Answer

In a reverted gear train, the first and last gears are mounted on the same shaft, allowing for a compact design while maintaining the gear ratio of a simple gear train spread over a longer distance.

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

Accepted Answer

C

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

Accepted Answer

Creep in a cross-belt drive occurs due to the elongation and contraction of the belt as it moves around the pulleys, leading to a slight difference in the actual and theoretical velocities of the belt. This phenomenon typically results in a reduction of the speed of the driven pulley and, as a consequence, a reduction in the power output, as the belt does not adhere perfectly to the pulleys, causing a slight slip.

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

Accepted Answer

A cylindrical type cam features a circumferential contour cut into the surface of a cylinder, which rotates about its axis. This design allows for the translation of rotational motion into linear motion of the follower along the cam's surface.

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

Accepted Answer

A pulley in a belt-drive system acts as a wrapping pair because the belt wraps around the pulley to transmit power through friction or engagement.

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

Accepted Answer

Cross-helical worm gears involve shafts that are non-parallel and non-intersecting, allowing for angular power transmission.

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

Accepted Answer

Ackermann steering gear consists of turning pairs, which allow the wheels to pivot around a vertical axis for steering.

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

Accepted Answer

The answer of Identify the incorrect statement if any
A)In case...

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

Accepted Answer

V-belts with E type cross-section are designed for heavy duty machines due to their larger size and ability to transmit higher power.

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

Accepted Answer

For uniform velocity, the displacement curve of the follower should have a constant slope, indicating a steady rate of change in displacement over time.

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

Accepted Answer

The pitch of gears can be expressed in various ways, including circular pitch, diametral pitch, and module. Each of these terms describes a different method for specifying the size and spacing of gear teeth, making all of them correct in the context of expressing gear pitch.

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

Accepted Answer

The answer of Coriolis component is encountered in
A)Slider crank mechanism
B)Four...

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

Accepted Answer

The mass moment of inertia is a measure of an object's resistance to changes in its rotation rate, which is essentially its resistance to angular acceleration.

Question 15

The number of forks provided in a Hooke's joint is
A)Three
B)Six
C)Two
D)One
E)Four

Accepted Answer

A Hooke's joint, also known as a universal joint, typically consists of two forks (or yokes) connected by a cross or spider.

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

Accepted Answer

Herringbone gears are designed with a double helical set of teeth that meet in a V shape, eliminating the axial thrust that typically occurs in single helical gears, thus making them free from axial thrust.

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

Accepted Answer

Hypoid gears are used for transmitting power between two shafts that are non-parallel and non-intersecting, allowing for a more versatile arrangement of the drivetrain components.

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

Accepted Answer

Coriolis acceleration occurs in a rotating reference frame, so it is associated with rotational motion.

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

Accepted Answer

The answer of The spring constant k of a coil-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

Accepted Answer

The profile of spur gears refers to the curve forming the face and flank of the gear teeth, which is essential for their operation and engagement with other gears.

Quiz 1: Mechanical Engineering Concepts

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

A reverted gear train is one is which

Slip in turning belt is

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

A cylindrical type cam is one

A pulley in a belt-drive acts as a

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

Ackermann steering gear consists of

Identify the incorrect statement if any

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

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

Pitch of gears is expressed by

Coriolis component is encountered in

The mass moment of inertia is

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

Which of the following gears is free from axial thrust

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

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

The spring constant k of a coil-spring is

In case of spur gears the profile is