Q.1

The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

  • εc + 2εl
  • 2εc + εl
  • εc + εl2
  • εc2 + εl
Q.2

A pressure vessel is said to be a thin shell, if the ratio of wall thickness to its diameter is equal to 1/10.

  • Yes
  • No
Q.3

A bolt of uniform strength can be developed by

  • keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
  • keeping the core diameter smaller than the diameter of the unthreaded portion
  • keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
  • none of the above
Q.4

The helix angle for single helical gears ranges from

  • 10° to 15°
  • 15° to 20°
  • 20° to 35°
  • 35° to 50°
Q.5

In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

  • normal pitch
  • axial pitch
  • diametral pitch
  • module
Q.6

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

  • angular bevel gears
  • crown bevel gears
  • internal bevel gears
  • mitre gears
Q.7

In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

  • normal pitch
  • axial pitch
  • diametral pitch
  • module
Q.8

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

  • 10 to 20%
  • 20 to 30%
  • 30 to 40%
  • 40 to 50%
Q.9

A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be

Q.10

The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to

Q.11

In order to withstand resistance to wear, the best profile of gear is

  • full depth involute tooth
  • 20° full depth involute tooth
    602-540-1.png
  • 20° involute stub tooth
    602-540-1.png
  • stub tooth
Q.12
A saddle key __________ power through frictional resistance only.
  • Transmits
  • Does not transmit
  • Either A or B
  • None of these
Q.13
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.14
The buckling load will be maximum for a column, if
  • One end of the column is clamped and the other end is free
  • Both ends of the column are clamped
  • Both ends of the column are hinged
  • One end of the column is hinged and the other end is free
Q.15
Which of the following screw thread is used for power transmission in one direction only?
  • Square threads
  • Multiple threads
  • Acme threads
  • Buttress threads
Q.16
Gears are casted by
  • Sand mould casting
  • Slush casting
  • Permanent mould casting
  • Centrifugal casting
Q.17
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
  • Working depth
  • Clearance
  • Backlash
  • Face width
Q.18
The size of a cam depends upon
  • Base circle
  • Pitch circle
  • Prime circle
  • Pitch curve
Q.19
Rivets are generally specified by
  • Thickness of plates to be riveted
  • Length of rivet
  • Diameter of head
  • Nominal diameter
Q.20
In a flange coupling, the bolts are subjected to
  • Tensile stress
  • Compressive stress
  • Shear stress
  • None of these
Q.21
The V-belts are particularly suitable for __________ drives.
  • Short
  • Long
  • Both A and B
  • None of these
Q.22
Which one of the following is a positive drive?
  • V-belt drive
  • Rope drive
  • Crossed flat belt drive
  • Chain drive
Q.23
The rolling contact bearings as compared to sliding contact bearings have
  • Low starting and low running friction except at very high speeds
  • Accuracy of shaft alignment
  • Small overall dimensions
  • All of the above
Q.24
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by
  • √2P/s.l
  • P/2.s.l
  • P/√2.s.l
  • 2P/s.l
Q.25
The centrifugal tension in belts
  • Decreases the power transmitted
  • Increases the power transmitted
  • Increase the wrap angle
  • Increases the belt tension without increasing power transmission
Q.26
In case of pressure vessels having closed ends, the fluid pressure induces
  • Longitudinal stress
  • Shear stress
  • Circumferential stress
  • None of these
Q.27
The yield point in static loading is __________ as compared to fatigue loading.
  • Higher
  • Lower
  • Same
  • None of these
Q.28
For high speed engines, the cam follower should move with
  • Uniform velocity
  • Simple harmonic motion
  • Uniform acceleration and retardation
  • Cycloidal motion
Q.29
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.
  • Twice
  • Four times
  • Eight times
  • Sixteen times
Q.30
For maximum power, the velocity of the belt will be
  • √(T/m)
  • √(T/2m)
  • √(T/3m)
  • None of these
Q.31
In the levers of first type, the mechanical advantage is ________ one.
  • Less than
  • Equal to
  • More than
  • None of these
Q.32
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
  • Knuckle threads
  • Square threads
  • Acme threads
  • Buttress threads
Q.33
The stress induced in the belt is,
  • Tensile stress
  • Compressive stress
  • Direct shear stress
  • Torsional shear stress
Q.34
In levers, leverage is the ratio of
  • Load lifted to the effort applied
  • Mechanical advantage to the velocity ratio
  • Load arm to the effort arm
  • Effort arm to the load arm
Q.35
When a close coiled helical spring is compressed, its wire is subjected to
  • Tension
  • Shear
  • Compression
  • All of the above
Q.36
If a load W is applied instantaneously on a bar; Then the stress induced in bar will
  • Be independent of ratio of mass of load W to mass of bar (y)
  • Increase with increase in y
  • Decrease with decrease in y
  • Depend on other considerations
Q.37
Plastic flow in ductile materials
  • Increases the seriousness of static loading stress concentration
  • Lessens the seriousness of static loading stress concentration
  • Has no effect on it
  • Depends on other considerations
Q.38
I.S. specifies following total number of grades of tolerances
  • 18
  • 16
  • 20
  • 22
Q.39
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)
  • 0.5 d
  • 0.75 d
  • d
  • 1.25 d
Q.40
The function of cutting oil when threading a pipe is to
  • Provide cooling action
  • Lubricate the dies
  • Help removes chips
  • All of the above
Q.41
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.42
If threads on a bolt are left hand, threads on nut will be
  • Right hand with same pitch
  • Left hand with same pitch
  • Could be left or right hand
  • Right hand with fine pitch
Q.43
The following type of nut is used with alien bolt
  • Hexagonal nut
  • Slotted nut
  • Castle nut
  • Any one of the above
Q.44
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by
  • Equating tearing resistance of the plate to the shearing resistance of the rivets
  • Equating tearing resistance of the plate to the crushing resistance of the rivets
  • Equating shearing resistance to the crushing resistance of the rivets
  • None of the above
Q.45
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by
  • Equating tearing resistance of the plate to the shearing resistance of the rivets
  • Equating tearing resistance of the plate to the crushing resistance of the rivets
  • Equating shearing resistance to the crushing resistance of the rivets
  • None of the above
Q.46
In second type of levers,
  • Load is in between the fulcrum and effort
  • Effort is in between the fulcrum and load
  • Fulcrum is in between the load and effort
  • None of these
Q.47
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is
  • 1 kN-m
  • 2 kN-m
  • 3 kN-m
  • 4 kN-m
Q.48
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.49
A connecting rod subjected to an axial load may buckle with
  • X-axis as neutral axis
  • Y-axis as neutral axis
  • X-axis or Y-axis as neutral axis
  • Z-axis
Q.50
Wire ropes as compared to cotton ropes
  • Are lighter in weight
  • Offer silent operation
  • Can withstand shock loads
  • All of these
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