Q.1

Lewis form factor for thefull depth involute system is equal to 0.- 0.841/T.

  • Correct
  • Incorrect
Q.2

The application of second 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
Q.3

The thickness of key is usually taken equal to one-sixth of diameter of shaft.

  • Yes
  • No
Q.4

In skew bevel gearing, the axes of shafts are

  • intersecting and the teeth are curved
  • non-intersecting and non-parallel and the teeth are curved
  • non-intersecting and non-parallel and the teeth are straight
  • none of the above
Q.5

The spindles of bench vices are usually provided with knuckle threads.

  • Agree
  • Disagree
Q.6

The railway carriage couplings have

  • square threads
  • acme threads
  • knuckle threads
  • buttress threads
Q.7

Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radiimm andmm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

  • W/2
  • 2 W/3
  • W/9
  • 8 W/9
Q.8

A chain drive transmits __________ power as compared to belt drive.

  • more
  • less
Q.9

Which of the following statement is correct?

  • The distance from a point on one thread to the corresponding point on the next thread is called pitch
  • The distance which a screw thread advances axially in one rotation of the nut is called lead
  • In single start threads, lead is equal to pitch
  • all of the above
Q.10

The taper on cotter and slot is made on both the sides.

  • Agree
  • Disagree
Q.11

Teflon is used for bearings because of

  • low coefficient of friction
  • better heat dissipation
  • smaller space consideration
  • all of these
Q.12

In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

  • 2 d
  • 3 d
  • 4 d
  • 5 d
Q.13

The acme threads are usually found on

  • spindles of bench vices
  • railway carriage couplings
  • feed mechanism of machine tools
  • screw cutting lathes
Q.14

The product of the diametral pitch and circular pitch is equal to

  • 1
  • 1/π
  • π
  • π x number of teeth
Q.15

The ratio of pitch circle diameter in millimetres to the number of teeth, is called

  • circular pitch
  • diametral pitch
  • module
  • none of these
Q.16

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

  • less than
  • equal to
  • more than
Q.17

In a marine flange coupling, the pitch circle diameter of bolts is taken as

  • 1.2 d
  • 1.6 d
  • 2 d
  • 2.5 d
Q.18

In a butt welded joint, the size of weld is __________ the throat of weld.

  • 0.5 times
  • equal to
  • 2 times
  • double
Q.19

Creep in belt is due to

  • material of the belt
  • material of the pulley
  • uneven extensions and contractions due to varying tension
  • all of the above
Q.20

While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

  • both the ends fixed
  • both the ends hinged
  • one end fixed and the other end hinged
  • one end fixed and the other end free
Q.21

According to Indian standard specifications,H6/g5 means that

  • tolerance grade for the hole is 6 and for the shaft is 5
  • tolerance grade for the shaft is 6 and for the hole is 5
  • tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
  • tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Q.22

The edges of the boiler plates are bevelled to an angle of

  • 45°
  • 60°
  • 70°
  • 80°
Q.23

The steel widely used for motor car crankshafts is

  • nickel steel
  • chrome steel
  • nickel chrome steel
  • high speed steel
Q.24

Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

  • Woodruff key
  • Feather key
  • Gib-head key
  • Tangent key
Q.25

A quarter turn belt drive is used when the shafts are arranged at right angles and rotate in one definite direction.

  • Yes
  • No
Q.26

The minimum number of teeth on the pinion which will mesh with any gear without interference forfull depth involute teeth will be

  • 12
  • 14
  • 18
  • 24
Q.27

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

  • bending stress only
  • a combination of torsional shear stress and bending
  • direct shear stress only
  • a combination of bending stress and direct shear stress
Q.28

A quarter turn belt drive is used when the shafts are arranged at right angles and rotate in one definite direction.

  • Yes
  • No
Q.29

The smallest diameter of an external or internal screw thread is known as

  • minor diameter
  • major diameter
  • pitch diameter
  • none of these
Q.30

Rankine Gordon formula for buckling is valid for

  • long column
  • short column
  • short and long column
  • very long column
Q.31

The smallest diameter of an external or internal screw thread is known as

  • minor diameter
  • major diameter
  • pitch diameter
  • none of these
Q.32

When compared to the rod of the same diameter and material, a wire rope

  • is less flexible
  • has a much smaller load carrying capacity
  • does not provide much warning before failure
  • provides much greater time for remedial action before failure
Q.33

Which of the following cotter joint will be used to connect strap end of a connecting rod ?

  • Spigot and socket cotter joint
  • Sleeve and cotter joint
  • Gib and cotter joint
  • any one of these
Q.34

According to Indian standard specifications, a plain carbon steel designated by 40C8 contains carbon

  • 0.20 to 0.40%
  • 0.35 to 0.45%
  • 0.40 to 0.60%
  • none of these
Q.35

A bolt of Mx 2 means that

  • the pitch of the thread is 24 mm and depth is 2 mm
  • cross-sectional area of the threads is 24 mm2
  • the nominal diameter of bolt is 24 mm and pitch is 2 mm
  • the effective diameter of bolt is 24 mm and there are 2 threads per cm
Q.36

In a journal bearing, the load on the bearing is __________ to the axis of the journal.

  • parallel
  • perpendicular
Q.37

The process which improves the machinability of steels, but lowers the hardness and tensile strength is

  • normalising
  • full annealing
  • process annealing
  • spheroidising
Q.38

The angle of twist of shaft is

  • directly proportional to (shaft diameter)2
  • inversely proportional to (shaft diameter)2
  • directly proportional to (shaft diameter)4
  • inversely proportional to (shaft diameter)4
Q.39

The stretching in a belt can be controlled by __________ the stress in the belt.

  • reducing
  • increasing
Q.40

According to Indian standards, total number of fundamental deviations are

  • 10
  • 15
  • 20
  • 25
Q.41

The stretching in a belt can be controlled by __________ the stress in the belt.

  • reducing
  • increasing
Q.42

When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

  • axially upwards
  • axially downwards
  • axially upwards or downwards
  • none of these
Q.43

The machine screws are

  • slotted for a screw driver and are generally used with a nut
  • similar to tap bolts except that they are of small size and a variety of shapes of heads are available
  • used to prevent relative motion between the two parts
  • none of the above
Q.44

In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

  • d + 17 mm
  • 2 d + 13 mm
  • 2 d + 20 mm
  • 3.5 d
Q.45

An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called

  • addendum circle
  • dedendum circle
  • pitch circle
  • clearance circle
Q.46

Which of the following statement is wrong ?

  • A key is used as a temporary fastening
  • A key is subjected to tensile stresses
  • A key is always inserted parallel to the axis of the shaft
  • A key prevents relative motion between the shaft and boss of the pulley
Q.47

A long helical spring having a spring stiffness ofkN/m and number of turnsbreaks into two parts with number of turnseach in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

  • 6 kN/m
  • 12 kN/m
  • 24 kN/m
  • 30 kN/m
Q.48

The distribution of the forces along the length of key fitted in a shaft

  • varies linearly
  • is uniform throughout
  • varies exponentially, being more near the torque-input end
  • varies exponentially, being less near the torque-input end
Q.49

In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

  • combined effect of transverse shear stress and bending stress in the wire
  • combined effect of bending stress and curvature of the wire
  • combined effect of transverse shear stress and curvature of wire
  • combined effect of torsional shear stress and transverse shear stress in the wire
Q.50

Which of the following bearing is preferred for oscillating conditions?

  • Double row roller bearing
  • Taper roller bearing
  • Angular contact single row ball bearing
  • Needle roller bearing
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