Elements of Machine Design-05

  1. Fundamentals of design
  2. Design of joints, levers and offset links
  3. Design of shafts, keys and couplings
  4. Design of power screws
  5. Design of springs
  6. Design of bolted and welded joints
  7. Selection of anti-friction bearings and gears

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1   The valve rod in a steam engine is connected to an eccentric rod by
    (A)   cotter joint
    (B)   bolted joint
    (C)   knuckle joint
    (D)   universal coupling
2   The strap end of a connecting rod of steam engine is joined by
    (A)   gib of cotter joint
    (B)   sleeve and cotter joint
    (C)   spigot socket cotter joint
    (D)   knuckle joint
3   The most important dimension in the design of a nut is
    (A)   Pitch diameter
    (B)   Inside diameter
    (C)   Outside diameter
    (D)   Height
4   Fillister, button, flat and hexagonal heads are all tightened externally.
    (A)   TRUE
    (B)   FALSE
5   Set screws are subjected to tensile forces only.
    (A)   Yes
    (B)   No, they are subjected to compressive forces only
    (C)   Both compressive and tensile
    (D)   Can’t be determined
6   Which type of joints is better when the product is subjected to large vibrations: welded or threaded?
    (A)   Welded
    (B)   Threaded
    (C)   Both have same results
    (D)   Depends on the magnitude of the vibrational force
7   If a fastener is threaded into a tapped hole, then the fastener is likely to be called as
    (A)   Screw
    (B)   Bolt
    (C)   Washer
    (D)   Screw or bolt
8   Which of the following requires more space for the rotation of spanner?
    (A)   Square Head
    (B)   Hexagonal Head
    (C)   Both require equal space of rotation
    (D)   Cannot be stated
9   If the lateral force acting on the set screw is large and tends to displace one part with respect to other than which point is recommended?
    (A)   Dog Point
    (B)   Cone Point
    (C)   Window Point
    (D)   Cut Point
10   The transverse shear stress at the root of the threads in the nut can be given by?(symbols have their usual meaning, z=number of threads in nut)
    (A)   4W/πdz²
    (B)   W/πdtz
    (C)   4W/πtd²
    (D)   None of the mentioned
11   A differential screw is defined as a mechanical device consisting of two screws connected in parallel.
    (A)   TRUE
    (B)   FALSE
12   A bolt
    (A)   has a head on one end and a nut fitted to the other
    (B)   has to head at one end and other end fits into a tapped hole in the other part to be joined
    (C)   has both the ends threaded
    (D)   is provided with pointed threads
13   Which of the following statement is correct?
    (A)   The distance from a point on one thread to the corresponding point on the next thread is called pitch
    (B)   The distance which a screw thread advances axially in one rotation of the nut is called lead
    (C)   In single start threads, lead is equal to the pitch
    (D)   all of the above
14   The minor diameter of a screw thread is also known as outside or nominal diameter.
    (A)   Correct
    (B)   Incorrect
15   A bolt of M24 x 2 means that
    (A)   the pitch of the thread is 24 mm and depth is 2 mm
    (B)   the cross-sectional area of the threads is 24
    (C)   the nominal diameter of the bolt is 24 mm and pitch is 2 mm
    (D)   the effective diameter of the bolt is 24 mm and there are 2 threads per cm
16   In threaded part M10 x 1.25, 1.25 indicates
    (A)   pitch
    (B)   lead
    (C)   nominal diameter
    (D)   none of the mentioned
17   The major diameter of a screw thread is also known as core or root diameter.
    (A)   Yes
    (B)   No
18   What type of force a knuckle joint can transmit
    (A)   Axial force
    (B)   Torque
    (C)   Bending
    (D)   Shear
19   In a turnbuckle, if one of the rods has left hand threads, then the other rod will have
    (A)   Right hand threads
    (B)   Left hand threads
    (C)   Multiple threads
    (D)   Pointed threads
20   The distance through which a screw thread advances axially in one turn is called
    (A)   Pitch of the thread
    (B)   Lead of the thread
    (C)   Depth of thread
    (D)   Diameter of thread
21   An ordinary bolt is converted into bolt of uniform strength by
    (A)   Reducing the shank diameter of bolt to the core diameter of threads
    (B)   Drilling a hole all along the length of shank in unthreaded portion
    (C)   Increasing the stress in the shank portion of bolt
    (D)   Using all three methods
22   The cross-section of a standard filled weld is a triangle with base angle of
    (A)   45 deg and 45 deg
    (B)   60 deg and 30 deg
    (C)   50 deg and 40 deg
    (D)   20 deg and 70 deg
23   If force act in a direction parallel to the direction of weld, then fillet weld is called as?
    (A)   Transverse
    (B)   Longitudinal
    (C)   Parallel
    (D)   Longitudinal or Parallel
24   Convex weld is generally preferred over normal weld.
    (A)   TRUE
    (B)   FALSE
25   Parallel fillet weld and transverse fillet weld both have the plane in which maximum shear stress occurs at 45 deg to the leg dimension.
    (A)   TRUE
    (B)   FALSE
26   The length of each of the two equal sides of a parallel fillet weld is called
    (A)   Leg
    (B)   Throat
    (C)   Arm
    (D)   None of the listed
27   Relation between throat and leg for a parallel fillet weld is
    (A)   t =h Cos (45 deg )
    (B)   h =t Cos (45 deg )
    (C)   h= t
    (D)   None of the listed
28   If length of weld is l and leg h, then area of throat can be given by
    (A)   0.707 hl
    (B)   1.414hl
    (C)   hl
    (D)   None of the listed
29   A steel plate is welded to another steel plate This is an example of transverse fillet weld.
    (A)   TRUE
    (B)   FALSE
30   The two plates are welded. It is an example of
    (A)   Parallel fillet weld
    (B)   Transverse fillet weld
    (C)   Parallel as well as transverse fillet weld
    (D)   None of the mentioned
31   In a plate, 75mm wide and 10mm thick, is joined with another plate as shown. The permissible tensile and shear stresses in the welds are 50/mm² and 40N/mm². Determine the required length of each parallel fillet weld if length of transverse weld is 40mm.
    (A)   11mm
    (B)   9mm
    (C)   8mm
    (D)   7mm
32   Strength of parallel fillet weld is greater than strength of transverse fillet weld.
    (A)   TRUE
    (B)   FALSE
33   Which type of joint is used if plate thickness is less than 5 mm?
    (A)   Single V butt weld
    (B)   Single U butt weld
    (C)   square butt weld
    (D)   Double U butt weld
34   Which welding symbol is shown below?
    (A)   Lap joint
    (B)   Single V butt joint
    (C)   Double fillet weld
    (D)   Single fillet weld
35   Calculate strength of the welded joint shown below, when 70 MPa is the allowable shear stress for the weld material.
    (A)   54.44 x 103 N
    (B)   77 x 103 N
    (C)   50 x 103 N
    (D)   None of the above
36   Calculate weld throat thickness for the parallel fillet weld shown below, if allowable shear stress is 80 MPa and tensile load of 300 kN is acting on it.
    (A)   2.6 mm
    (B)   9.56 mm
    (C)   9.86 mm
    (D)   8.36 mm
37   Calculate weld size if weld throat thickness for the fillet weld is 8.2 mm
    (A)   10 mm
    (B)   14.20 mm
    (C)   16.4 mm
    (D)   12 mm
38   Axially loaded unsymmetrical welded joint is shown below, if total length of the weld is (la + lb) then length of weld la is given as
    (A)   (b / (a+b)) x l
    (B)   (a / (a+b)) x l
    (C)   (a / (a -b)) x l
    (D)   (b / (a-b)) x l
39   In the diagram shown below la = lb = 100 mm, what is the load carrying capacity if weld size is 15 mm and shear stress for the weld is 100 MPa
    (A)   200 kN
    (B)   310 kN
    (C)   212.13 kN
    (D)   121.13 kN
40   If welds are designed with in-plane eccentric load, then eccentric load can be replaced by ——-
    (A)   parallel force
    (B)   twisting moment
    (C)   both A and B
    (D)   none of the above
41   Which of the following statements is/are false? 1. Under fatigue load, casted structures are stronger than welded structures 2. Welding cannot produce complicated structures 3. Welding can join dissimilar materials 4. Rivetted joints produce light weight constructions as compared to welded joints
    (A)   Statement 1 and Statement 3
    (B)   Statement 1, 2 and Statement 4
    (C)   Statement 1, 2 and Statement 3
    (D)   All the above statements are false
42   A cotter join used to connect two rods which are
    (A)   Co-axial
    (B)   Perpendicular
    (C)   Parallel
    (D)   None the above
43   Cotter join is used when members are subjected to which type of stresses?
    (A)   Axial tensile
    (B)   Axial compressive
    (C)   Axial tension or compressive
    (D)   None of the above
44   Which of the following is not the part of the cotter joint?
    (A)   Socket
    (B)   Spigot
    (C)   Cotter
    (D)   Collar
45   Can cotter joint be used to connect two rods for torque transmission purpose
    (A)   TRUE
    (B)   FALSE
46   Thickness of plate is required more in welding than in riveting
    (A)   TRUE
    (B)   FALSE
47   Which of the following are important parts of knuckle joint?
    (A)   Eye
    (B)   Pin
    (C)   Fork
    (D)   Each of the mention
48   In gas welding which of the following is generally used?
    (A)   Oxygen-Hydrogen
    (B)   Oxygen-Acetylene
    (C)   Oxygen-Hydrogen or Oxygen-Acetylene
    (D)   None of the mentioned
49   Which type of welding is generally used in automobile sector?
    (A)   Electric arc welding
    (B)   Electric resistance welding
    (C)   Gas welding
    (D)   Forge welding
50   what type of threads are suitable for small precision components and measuring gauges?
    (A)   British Association Threads
    (B)   Whitworth Screw threads
    (C)   Acme threads
    (D)   Square Threads
51   which one of the following screw thread forms has an included angle of 29 Degree?
    (A)   B.A. thread
    (B)   Acme thread
    (C)   Buttress thread
    (D)   Knuckle thread
52   B.S.W screw thread have the included angle of?
    (A)   30 Degree
    (B)   45Degree
    (C)   55Degree
    (D)   60Degree
53   which of the following is permanent fastening?
    (A)   Screw fastening
    (B)   Fastening with nut and bolt
    (C)   Brazing
    (D)   Welding
54   Top surface of thread is called?
    (A)   Crest
    (B)   Root
    (C)   Depth of thread
    (D)   None of above
55   Crest is called as?
    (A)   Bottom surface of thread
    (B)   Top surface of thread
    (C)   Both
    (D)   None of above
56   the following is not correct for the fasteners
    (A)   low cost of fasteners
    (B)   Easy to available
    (C)   Difficult to assemble and disassemble
    (D)   less weight
57   Stud having thread?
    (A)   At one side
    (B)   No thread
    (C)   Both side
    (D)   full body
58   Which type of threads are used to transmit power in one direction.
    (A)   Square threads
    (B)   Buttress threads
    (C)   Both A and B
    (D)   None of the above
59   Threads used in screw fasteners are —–
    (A)   Having high strength.
    (B)   having low efficiency
    (C)   single start type
    (D)   all of the above
60   Fasteners are made of?
    (A)   Metal
    (B)   Rubber
    (C)   Wood
    (D)   None
61   what is mean Major Diameter?
    (A)   Largest Diameter of thread
    (B)   Smallest diameter of thread
    (C)   None of the above
    (D)   Both
62   Square Thread having the following Angle?
    (A)   29 deg
    (B)   30 deg
    (C)   0 deg
    (D)   55 deg
63   Fasteners are———
    (A)   Leak proof
    (B)   Not leak proof
    (C)   None
    (D)   Both
64   In lever terminology, ‘mechanical advantage’ is the ratio of
    (A)   Load to effort
    (B)   Effort to load
    (C)   Load arm to effort arm
    (D)   None of the above
65   Levers of Class 2 have
    (A)   Fulcrum placed between the effort and load
    (B)   between the load and the fulcrum
    (C)   Load in-between the effort and the fulcrum
    (D)   None
66   Properties of Class 3 are
    (A)   Load in-between the effort and the fulcrum
    (B)   Effort between the load and the fulcrum
    (C)   Fulcrum placed between the effort and load
    (D)   None
67   Classification of Levers are based on
    (A)   The load and effort located with respect to the fulcrum
    (B)   fulcrum and effort are located with respect to the load
    (C)   where the load and fulcrum are located with respect to the effort
    (D)   None
68   Select the Class 1 from the following examples of levers
    (A)   Fishing rod
    (B)   Crowbar
    (C)   Stapler
    (D)   None
69   Identify Class 2 from the following examples of levers
    (A)   Stapler
    (B)   Crowbar
    (C)   Fishing rod
    (D)   None
70   Choose the Class 3 from the following examples of levers
    (A)   Crowbar
    (B)   Stapler
    (C)   Fishing rod
    (D)   None
71   Tell the Class 1 from the following examples of levers
    (A)   Baseball bat
    (B)   Can opener
    (C)   Plier
    (D)   None
72   Point out the Class 2 from the following examples of levers
    (A)   Can opener
    (B)   Baseball bat
    (C)   Plier
    (D)   None
73   From the following examples of levers, select the Class 3 lever,
    (A)   Plier
    (B)   Baseball bat
    (C)   Can opener
    (D)   None
74   Mechanical advantage is
    (A)   Distance object moved / Distance effort applied
    (B)   Distance effort applied / Distance object moved
    (C)   Distance effort applied x Distance object moved
    (D)   None
75   Another way of defining Mechanical advantage is
    (A)   Input force/ Output force
    (B)   Output force/ Input force
    (C)   Input force x Output force
    (D)   None
76   Mechanical advantage is the ratio of effort to load.
    (A)   TRUE
    (B)   FALSE
77   Leverage is the ratio of load arm to effort arm
    (A)   TRUE
    (B)   FALSE
78   A bottle opener belongs to which class of the levers
    (A)   Effort in the middle
    (B)   Fulcrum in the middle
    (C)   Resistance in the middle
    (D)   None of the mentioned

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