Q.1

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

  • head
  • shank
  • thread
  • middle
Q.2

A column is known as a long column if the slenderness ratio is

  • 40
  • 50
  • 70
  • 100
Q.3

The toughness of a material __________ when it is heated.

  • increases
  • decreases
  • does not change
Q.4

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

  • castle nut
  • jam nut
  • ring nut
  • sawn nut
Q.5

The square threads are not so strong as V-threads but they offer less frictional resistance to motion than Whitworth threads.

  • Correct
  • Incorrect
Q.6

Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that

  • shaft B is better than shaft A
  • shaft A is better than shaft B
  • both the shafts are equally good
Q.7

Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.

  • elastic strength
  • yield strength
  • shear strength
Q.8

Which of the following statement is correct for gears?

  • The addendum is less than dedendum
  • The pitch circle diameter is equal to the product of module and number of teeth
  • The pitch circle is always greater than the base circle
  • all of the above
Q.9

According to Guest'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 simple tension test.

  • True
  • False
Q.10

In order to obtain the bolts of uniform strength, an axial hole is drilled through the head as far as the threaded portion such that the area of shank becomes equal to the root area of the thread.

  • True
  • False
Q.11

In a crossed belt drive, the shafts are arranged parallel and rotate in the same directions.

  • Correct
  • Incorrect
Q.12

The rolling contact bearings as compared to sliding contact bearings have

  • small overall dimensions
  • accuracy of shaft alignment
  • low starting and low running friction except at very high speeds
  • all of the above
Q.13

The metal suitable for bearings subjected to light loads is

  • silicon bronze
  • white metal
  • monel metal
  • phosphor bronze
Q.14

Circumferential joint in boilers is used to get the required length of a boiler.

  • True
  • False
Q.15

The number of slots in amm castle nut is

  • 2
  • 4
  • 6
  • 8
Q.16

Slenderness ratio is the ratio of

  • maximum size of column to minimum size of column
  • width of column to depth of column
  • effective length of column to least radius of gyration of the column
  • effective length of column to width of column
Q.17

A shaft is subjected to a maximum bending stress ofN/mm2 and maximum shearing stress equal toN/mm2 at a particular section. If the yield point in tension of the material isN/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

  • 2.5
  • 2.8
  • 3.0
  • 3.5
Q.18

According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

  • d = t
  • d = 1.6 t
  • d = 2 t
  • d = 6 t
Q.19

In a flange coupling, the flanges are coupled together by means of

  • bolts and nuts
  • studs
  • headless taper bolts
  • none of these
Q.20

A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

  • less than 20 d
  • greater than 30 d
  • between 20 d and 30 d
  • equal to inside diameter of pipe
Q.21

An open belt drive is used when

  • shafts are arranged parallel and rotate in the opposite directions
  • shafts are arranged parallel and rotate in the same directions
  • shafts are arranged at right angles and rotate in one definite direction
  • driven shaft is to be started or stopped whenever desired without interferring with the driving shaft
Q.22

In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

  • helix angle
  • pressure angle
  • pitch lead angle
  • none of these
Q.23

The maximum normal stress theory is used for

  • brittle materials
  • ductile materials
  • plastic materials
  • non-ferrous materials
Q.24

The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

  • working depth
  • clearance
  • face width
  • backlash
Q.25

A connecting rod subjected to an axial load may buckle in the plane perpendicular to the plane of motion of the connecting rod.

  • Correct
  • Incorrect
Q.26

A steel containing more than 0.carbon is known as eutectoid steel.

  • Yes
  • No
Q.27

The ball bearings are provided with a cage

  • to reduce friction
  • to facilitate slipping of balls
  • to prevent the lubricant from flowing out
  • to maintain the balls at a fixed distance apart
Q.28

A screw is said to be over hauling screw, if its efficiency is

  • less than 50%
  • more than 50%
  • equal to 50%
  • none of these
Q.29

A crankshaft is a __________ shaft.

  • transmission
  • machine
Q.30

The longitudinal stress is __________ of the circumferential stress.

  • one-half
  • two-third
  • three-fourth
  • double
Q.31

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

  • d
  • 1.5 d
  • 2 d
  • 2.5 d
Q.32

Which of the following statement is wrong ?

  • The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts
  • The V-belt drive is used with large centre distance
  • The V-belt may be operated in either direction with tight side of the belt at the top or bottom
  • The ratio of driving tensions in V-belt drive is more than flat belt drives
Q.33

A transmission shaft includes

  • counter shaft
  • line shaft
  • over head shaft
  • all of these
Q.34

Stress concentration is caused due to

  • variations in load acting on a member
  • variations in properties of materials in a member
  • abrupt change of cross-section
  • all of these
Q.35

Which of the following statement is wrong ?

  • The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts
  • The V-belt drive is used with large centre distance
  • The V-belt may be operated in either direction with tight side of the belt at the top or bottom
  • The ratio of driving tensions in V-belt drive is more than flat belt drives
Q.36

Surface endurance limit of gear material is dependent upon its

  • elastic strength
  • yield strength
  • brinell hardness number
  • toughness
Q.37

In unilateral system of tolerance, the tolerance is allowed on

  • one side of the actual size
  • one side of the nominal size
  • both sides of the actual size
  • both sides of the nominal size
Q.38

Surface endurance limit of gear material is dependent upon its

  • elastic strength
  • yield strength
  • brinell hardness number
  • toughness
Q.39

Idler pulley is used for

  • increasing velocity ratio
  • for applying tension
  • changing the direction of motion of belt
  • all of these
Q.40

When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as

  • spur gearing
  • helical gearing
  • bevel gearing
  • spiral gearing
Q.41

Screws jacks have multiple threads.

  • Agree
  • Disagree
Q.42

When a load W is suddenly applied to a bar of weight W1, the stress induced in the bar will increase with the increase in weight W1.

  • Correct
  • Incorrect
Q.43

The elasticity 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.44

The contact ratio is the ratio of

  • length of path of contact to the circular pitch
  • length of arc of contact to the circular pitch
  • length of arc of approach to the circular pitch
  • length of arc of recess to the circular pitch
Q.45

Which one of the following is a positive drive?

  • Crossed flat belt drive
  • Rope drive
  • V-belt drive
  • Chain drive
Q.46

Which of the following is an antifriction bearing?

  • journal bearing
  • pedestal bearing
  • collar bearing
  • needle bearing
Q.47

In leaf springs, the longest leaf is known as

  • lower leaf
  • master leaf
  • upper leaf
  • none of these
Q.48

In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

  • right hand
  • left hand
Q.49

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

  • square threads
  • acme threads
  • knuckle threads
  • buttress threads
Q.50

The application of third type levers is found in

  • handle of a hand pump
  • hand wheel of a punching press
  • lever of a loaded safety valve
  • a pair of tongs
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