Q.1

The ratio of driving tensions in V-belt drives is __________ flat belt drives.

  • equal to
  • sin α times more than
  • sin α times less than
  • cosec α times more than
Q.2

The yield point in static loading is __________ as compared to fatigue loading.

  • higher
  • lower
  • same
Q.3

Wahl's stress factor __________ very rapidly as the spring index decreases.

  • increases
  • decreases
Q.4

An universal coupling is used to connect two shafts

  • which are perfectly aligned
  • which are not in exact alignment
  • have lateral misalignment
  • whose axes intersect at a small angle
Q.5

A shoe brake is commonly used in railway trains.

  • Yes
  • No
Q.6

The dedendum circle diameter is equal to (where φ = Pressure angle)

  • pitch circle diameter x cos φ
  • addendum circle diameter x cos φ
  • clearance circle diameter x cos φ
  • pitch circle diameter x sin φ
Q.7

When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

  • have contact at the bottom most of the bearing
  • move towards right of the bearing making the metal to metal contact
  • move towards right of the bearing making no metal to metal contact
  • move towards left of the bearing making metal to metal contact
Q.8

A steel containing __________ 0.carbon is known as hypo-eutectoid steel.

  • equal to
  • less than
  • greater than
Q.9

Which of the following statement is wrong?

  • The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets
  • The pitch of rivets should not be less than 2 d, where d is the diameter of rivet hole
  • The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm
  • According to I.B.R., the thickness of butt strap shall not be less than 5 mm
Q.10

According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

  • 45 to 60%
  • 63 to 70%
  • 70 to 83%
  • 80 to 90%
Q.11

The rolling contact bearings are known as

  • thick lubricated bearings
  • plastic bearings
  • thin lubricated bearings
  • antifriction bearings
Q.12

If a bearing is designated by the numberit means that the bearing is of

  • light series whose bore is 5 mm
  • light series whose bore is 25 mm
  • medium series whose bore is 5 mm
  • medium series whose bore is 25 mm
Q.13

The major diameter of a screw thread is also known as core or root diameter.

  • Yes
  • No
Q.14

All stresses produced in a belt are

  • compressive stresses
  • tensile stresses
  • both tensile and compressive stresses
  • shear stresses
Q.15

According to Rankine's theory, the failure occurs at a point in a member

  • when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in a simple tension test
  • when the maximum principal stress in a bi-axial stress system reaches the elastic limit of the material in a simple tension test
  • when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test
  • when the maximum principal strain in a bi-axial stress system reaches the strain at the elastic limit as determined from a simple tension test
Q.16

When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

  • 0.20
  • 0.35
  • 0.50
  • 0.65
Q.17

The resilience of a bolt may be increased by

  • increasing its shank diameter
  • increasing its length
  • decreasing its shank diameter
  • decreasing its length
Q.18

In worm, gears, pitch lead angle is

  • half the angle between two inclined faces in axial plane
  • the angle between the tangent to the pitch helix and the plane of rotation
  • the angle between the tangent to the pitch helix and an element of the cylinder
  • none of the above
Q.19

When two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft, the arrangement is known as spiral gearing.

  • Yes
  • No
Q.20

A wood-ruff key is

  • a tapered key with head at one end
  • fitted in pairs at right angles
  • capable of tilting in a recess milled out in the shaft
  • all of the above
Q.21

A sliding bearing in which the working surfaces are completely separated from each other by lubricant is called zero film bearing.

  • True
  • False
Q.22

A basic hole is one whose

  • lower deviation is zero
  • upper deviation is zero
  • lower and upper deviations are zero
  • none of these
Q.23

According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

  • 0.5 mm upto rivet diameter of 24 mm
  • 1 mm for rivet diameter from 27 mm to 36 mm
  • 2 mm for rivet diameter from 39 mm to 48 mm
  • all of the above
Q.24

A shaft is designed on the basis of rigidity and stiffness.

  • Correct
  • Incorrect
Q.25

For circumferential joint in boilers, the type of joint used is

  • butt joint with single cover plate
  • butt joint with double cover plate
  • lap joint with one ring overlapping the other
  • any one of the above
Q.26

A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

  • sunk key
  • flat saddle key
  • hollow saddle key
  • tangent key
Q.27

If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

  • Maximum principal stress theory
  • Maximum shear stress theory
  • Maximum strain energy theory
  • Maximum distortion energy theory
Q.28

When two non-parallel or intersecting but coplaner shafts are connected by gears, the arrangement is known as bevel gearing.

  • Correct
  • Incorrect
Q.29

The backlash for spur gears depends upon

  • module
  • pitch line velocity
  • tooth profile
  • both (a) and (b)
Q.30

Tapered roller bearings can take

  • radial load only
  • axial load only
  • both radial and axial loads and the ratio of these being less than unity
  • both radial and axial loads and the ratio of these being greater than unity
Q.31

The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

  • 1420 d
  • 1680 d
  • 2080 d
  • 2840 d
Q.32

The dedendum is the radial distance from the

  • pitch circle to the top of a tooth
  • pitch circle to the bottom of a tooth
  • top of a tooth to the bottom of a tooth
  • addendum circle to the clearance circle
Q.33

The lead angle of a worm is 22.5°. Its helix angle will be

  • 22.5°
  • 45°
  • 67.5°
  • 90°
Q.34

A screw is specified by its

  • major diameter
  • minor diameter
  • pitch diameter
  • pitch
Q.35

In a V-belt drive, the belt makes contact at the bottom of the groove of the pulley.

  • Agree
  • Disagree
Q.36

Screws used for power transmission should have

  • Low efficiency
  • high efficiency
  • very fine threads
  • strong teeth
Q.37

In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.

  • 90°
  • 135°
  • 160°
  • 180°
Q.38

The cam follower extensively used in air-craft engines is

  • knife edge follower
  • flat faced follower
  • spherical faced follower
  • roller follower
Q.39

Which of the following spring is used in mechanical wrist watch?

  • Helical compression spring
  • Spiral spring
  • Torsion spring
  • Bellevile spring
Q.40

In cyclic loading, stress concentration is more serious in

  • brittle materials
  • ductile materials
  • brittle as well as ductile materials
  • elastic materials
Q.41

The size of a gear is usually specified by

  • pressure angle
  • pitch circle diameter
  • circular pitch
  • diametral pitch
Q.42

In order to remove internal stresses produced by hardening the steel, the process usually adopted is

  • tempering
  • annealing
  • normalising
  • spheroidising
Q.43

The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

  • plasticity
  • elasticity
  • ductility
  • malleability
Q.44

In a steam engine, the valve rod is connected to an eccentric rod by means of

  • cotter joint
  • knuckle joint
  • universal joint
  • flange coupling
Q.45

The root angle of a bevel gear is equal to

  • pitch angle - addendum angle
  • pitch angle + addendum angle
  • pitch angle - dedendum angle
  • pitch angle + dedendum angle
Q.46

The wear load should be __________ the dynamic load.

  • equal to
  • less than
  • greater than
Q.47

The number of rivets in shear shall be equal to the number of rivets in crushing.

  • Correct
  • Incorrect
Q.48

The minor diameter of a screw thread is also known as outside or nominal diameter.

  • Correct
  • Incorrect
Q.49

In helical bevel gearing, the axes of shafts are __________ and the teeth are curved.

  • intersecting
  • non-intersecting and non-parallel
Q.50

For a square key made of mild steel, the shear and crushing strength are related as

  • shear strength is equal to crushing strength
  • shear strength is greater than crushing strength
  • shear strength is less than crushing strength
  • none of the above
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