Q.1

In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower isand driver and follower pulley diameters are equal, then velocity ratio of the drive will be

  • 0.96
  • 0.97
  • 0.98
  • 0.99
Q.2

The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.

  • True
  • False
Q.3

When the effort is in between the fulcrum and load, the lever is said to be of third type.

  • Correct
  • Incorrect
Q.4

The bolts of smaller diameter than Mare not permitted in making fluid tight joints.

  • Correct
  • Incorrect
Q.5

The shafts of larger diameter are usually forged and turned to size in a lathe.

  • Yes
  • No
Q.6

The gears are termed as medium velocity gears, if their peripheral velocity is

  • 1-3 m/s
  • 3-15 m/s
  • 15-30 m/s
  • 30-50 m/s
Q.7

The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

  • Gerber relation
  • Soderberg relation
  • Good man relation
  • none of these
Q.8

The groove angle of the pulley for rope drive is usually

  • 20°
  • 35°
  • 45°
  • 60°
Q.9

A cotter joint is used to connect two __________ rods.

  • co-axial
  • perpendicular
  • parallel
Q.10

The spigot and socket joint is mostly used for pipes which are burried in the earth.

  • Agree
  • Disagree
Q.11

When a hole of diameter 'd' is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

  • d.t.τu
    568-143-1.png
    568-143-1.png
  • πd.t.τu
    568-143-1.png
    568-143-1.png
  • x d2τu
  • x d2 x tτu
Q.12

The permissible stress in the fillet weld isN/mm2. The fillet weld has equal leg lengths ofmm each. The allowable shearing load on the weldment per cm length of the weld is

  • 7.5 kN
  • 10.6 kN
  • 15 kN
  • 22.5 kN
Q.13

A turn buckle is used to connect two round rods subjected to tensile loading and requiring subsequent adjustment for tightening or loosening.

  • Yes
  • No
Q.14

If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

  • increases
  • decreases
  • remains unchanged
Q.15

The product of the diametral pitch and module is equal to one.

  • Correct
  • Incorrect
Q.16

In case of pressure vessels having open ends, the fluid pressure induces

  • longitudinal stress
  • circumferential stress
  • shear stress
  • none of these
Q.17

The plasticity is the property of a material which enables it to

  • regain its original shape after deformation when the external forces are removed
  • draw into wires by the application of a tensile force
  • resist fracture due to high impact loads
  • retain deformation produced under load permanently
Q.18

A saddle key __________ power through frictional resistance only.

  • transmits
  • does not transmit
Q.19

The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ is equal to 6/6 + v.

  • 10 m/s
  • 12.5 m/s
  • 15 m/s
  • 20 m/s
Q.20

The product of the diametral pitch and module is equal to one.

  • Correct
  • Incorrect
Q.21

In cylindrical cams, the follower moves

  • in a direction perpendicular to the cam axis
  • in a direction parallel to the cam axis
  • in any direction irrespective of cam axis
  • along the cam axis
Q.22

Guest's theory is used for

  • brittle materials
  • ductile materials
  • elastic materials
  • plastic materials
Q.23

A screw is said to be over hauling screw, if the

  • friction angle is less than helix angle
  • friction angle is more than helix angle
  • friction angle is equal to helix angle
  • efficiency of screw is 100%
Q.24

The static tooth load should be __________ the dynamic load.

  • equal to
  • less than
  • greater than
Q.25

In the levers of first type, the mechanical advantage is __________ one.

  • less than
  • equal to
  • more than
Q.26

Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

  • F + P
  • F - P
  • P
  • F
Q.27

The set screws are used to prevent relative motion between the two parts.

  • Correct
  • Incorrect
Q.28

An open coiled helical compression spring 'A' of mean diametermm is subjected to an axial load W. Another spring 'B' of mean diametermm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

  • one-eighth
  • one-fourth
  • one-half
  • double
Q.29

A rivet is specified by

  • shank diameter
  • length of rivet
  • type of head
  • length of tail
Q.30

The power transmitted by means of a belt depends upon

  • velocity of the belt
  • tension under which the belt is placed on the pulleys
  • arc of contact between the belt and the smaller pulley
  • all of the above
Q.31

The included angle for the acme thread is 29°.

  • True
  • False
Q.32

The square threads are usually found on

  • spindles of bench vices
  • railway carriage couplings
  • feed mechanism of machine tools
  • screw cutting lathes
Q.33

Shaft coupling is used in machinery to

  • introduce mechanical flexibility
  • introduce protection against over loads
  • reduce the transmission of shock loads
  • all of these
Q.34

Power screws are used to convert rotary motion into translatory motion.

  • True
  • False
Q.35

The load placed at the top of the screw in a mechanical screw jack is prevented from rotation by providing a swivelling mechanism.

  • Correct
  • Incorrect
Q.36

The bearings of medium series have capacity __________ over the light series.

  • 10 to 20%
  • 20 to 30%
  • 30 to 40%
  • 40 to 50%
Q.37

The face 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.38

When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

  • initial tension
  • external load applied
  • sum of the initial tension and external load applied
  • initial tension or external load, whichever is greater
Q.39

In thrust bearings, the load acts

  • along the axis of rotation
  • parallel to the axis of rotation
  • perpendicular to the axis of rotation
  • in any direction
Q.40

Auto frettage is the method of

  • joining thick cylinders
  • calculating stresses in thick cylinders
  • prestressing thick cylinders
  • increasing the life of thick cylinders
Q.41

Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment ?

  • Bushed pin type coupling
  • Universal coupling
  • Oldham coupling
  • all of these
Q.42

The process extensively used for making bolts and nuts is

  • hot piercing
  • extrusion
  • cold peening
  • cold heading
Q.43

Oldham coupling is used to connect two shafts

  • which are perfectly aligned
  • which are not in exact alignment
  • which have lateral misalignment
  • whose axes intersect at a small angle
Q.44

The function of the washer is to

  • absorb shocks and vibrations
  • fill up the axial gap
  • provide bearing area
  • provide cushioning effect
Q.45

The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

  • d/8
  • d/6
  • d/4
  • d/2
Q.46

The antifriction bearings

  • have low starting and low running friction at moderate speeds
  • have high initial cost
  • can carry both radial and thrust loads
  • all of these
Q.47

Two shafts will have equal strength, if

  • diameter of both the shafts is same
  • angle of twist of both the shafts is same
  • material of both the shafts is same
  • twisting moment of both the shafts is same
Q.48

During hot working of metals,

  • porosity of the metal is largely eliminated
  • grain structure of the metal is refined
  • mechanical properties are improved due of refinement of grains
  • all of the above
Q.49

According to Indian standard specifications, a grey cast iron designated by 'FGmeans that the

  • carbon content is 2%
  • maximum compressive strength is 200 N/mm2
  • minimum tensile strength is 200 N/mm2
  • maximum shear strength is 200 N/mm2
Q.50

In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

  • reduce vibration
  • reduce slip
  • ensure uniform loading
  • ensure proper alignment
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