MECHANICAL ENGINEERING- PAGE 5
Mechanical Engineering MCQs- Page 5
1. Warning signs are __________ in shapes with black sign and black border.
(A) Square (B) Round (C) Rectangle (D) Triangle
Ans: D
2. The factors in a fire triangle are Oxygen, heat and __________.
(A) Water (B) Fuel
(C) Both (A) and (B) (D) None of these
Ans: B
3. WWW is developed by :
(A) Tim Berners-Lee (B) Charles Babbage
(C) Thomas Alva Edison (D) Faraday
Ans: A
4. __________ signs indicate necessity of work shown in signs and are in circular shapes.
(A) Information signs (B) Prohibition signs
(C) Mandatory signs (D) None of these
Ans: C
5. List of Luminous intensity is S.I. Systems is __________.
(A) Ampere (B) Candela (C) Volt (D) Ohm
Ans: B
6. Outside micrometer is also known as __________.
(A) Plug gauge (B) Feeler gauge (C) Screw gauge (D) Vernier Caliper
Ans: C
7. Formula for finding least count of vernier caliper is :
(A) 1 MSD - 1 VSD (B) 1 mm - least count
(C) 1 cm - 1 mm (D) None of these
Ans: A
8. For squaring small holes which chisel is used :
(A) Firmer chisel (B) Diamond point chisel
(C) Cross cut chisel (D) All of the above
Ans: B
9. The length of a file from point to :
(A) Tip (B) Tang (C) Face (D) Heel
Ans: D
10. Usually files are made up of :
(A) High grade steel (B) High speed steel
(C) Low carbon steel (D) Mild steel
Ans: A
11. __________ cut files are used for soft metal.
(A) Smooth (B) Second cut (C) Rough (D) Super smooth
Ans: C
12. The number of cuts over a length of 10 mm for a bastard file of 300 mm is :
(A) 4 (B) 11 (C) 13 (D) 9
Ans: D
13. For harder metals, excellent file for good finish for many pieces of fitting work is :
(A) Second cut (B) Rough (C) Smooth (D) Dead Smooth
Ans: A
14. Filing narrow slots, notches and grooves __________ files is used.
(A) Triangular file (B) Knife edge file (C) Half round file (D) Flat file
Ans: B
15. Cuts of files are divided into ___________ groups.
(A) Two (B) Three (C) Three (D) Four
Ans: D
(A) Square (B) Round (C) Rectangle (D) Triangle
Ans: D
2. The factors in a fire triangle are Oxygen, heat and __________.
(A) Water (B) Fuel
(C) Both (A) and (B) (D) None of these
Ans: B
3. WWW is developed by :
(A) Tim Berners-Lee (B) Charles Babbage
(C) Thomas Alva Edison (D) Faraday
Ans: A
4. __________ signs indicate necessity of work shown in signs and are in circular shapes.
(A) Information signs (B) Prohibition signs
(C) Mandatory signs (D) None of these
Ans: C
5. List of Luminous intensity is S.I. Systems is __________.
(A) Ampere (B) Candela (C) Volt (D) Ohm
Ans: B
6. Outside micrometer is also known as __________.
(A) Plug gauge (B) Feeler gauge (C) Screw gauge (D) Vernier Caliper
Ans: C
7. Formula for finding least count of vernier caliper is :
(A) 1 MSD - 1 VSD (B) 1 mm - least count
(C) 1 cm - 1 mm (D) None of these
Ans: A
8. For squaring small holes which chisel is used :
(A) Firmer chisel (B) Diamond point chisel
(C) Cross cut chisel (D) All of the above
Ans: B
9. The length of a file from point to :
(A) Tip (B) Tang (C) Face (D) Heel
Ans: D
10. Usually files are made up of :
(A) High grade steel (B) High speed steel
(C) Low carbon steel (D) Mild steel
Ans: A
11. __________ cut files are used for soft metal.
(A) Smooth (B) Second cut (C) Rough (D) Super smooth
Ans: C
12. The number of cuts over a length of 10 mm for a bastard file of 300 mm is :
(A) 4 (B) 11 (C) 13 (D) 9
Ans: D
13. For harder metals, excellent file for good finish for many pieces of fitting work is :
(A) Second cut (B) Rough (C) Smooth (D) Dead Smooth
Ans: A
14. Filing narrow slots, notches and grooves __________ files is used.
(A) Triangular file (B) Knife edge file (C) Half round file (D) Flat file
Ans: B
15. Cuts of files are divided into ___________ groups.
(A) Two (B) Three (C) Three (D) Four
Ans: D
16. The term surface finish refers to the :
(A) Shining of a machined surface
(B) Type of coating given on a surface
(C) Heat treatment given on a surface
(D) Roughness or smoothness of a surface
Ans: D
17. __________ is the relationship that exists between two mating parts, a hole and shaft, with respect to their dimensional differences before assembly.
(A) Fit (B) Tolerance (C) Deviation (D) Allowance
Ans: A
18. A service petroleum pipe line flange is to be drilled. Which machine would you choose out of the following ?
(A) Electrical hand drilling machine (B) Pneumatic hand drilling machine
(C) Sensitive drilling machine (D) Pillar drilling machine
Ans: B
19. Least count of a Vernier metric micrometer is :
(A) 0.1 mm (B) 0.01 mm (C) 0.001 mm (D) 0.0001 mm
Ans: C
20. A chemical compound of carbon with iron is called :
(A) Ferrite (B) Cementite (C) Pearlite (D) Austenite
Ans: B
(A) Shining of a machined surface
(B) Type of coating given on a surface
(C) Heat treatment given on a surface
(D) Roughness or smoothness of a surface
Ans: D
17. __________ is the relationship that exists between two mating parts, a hole and shaft, with respect to their dimensional differences before assembly.
(A) Fit (B) Tolerance (C) Deviation (D) Allowance
Ans: A
18. A service petroleum pipe line flange is to be drilled. Which machine would you choose out of the following ?
(A) Electrical hand drilling machine (B) Pneumatic hand drilling machine
(C) Sensitive drilling machine (D) Pillar drilling machine
Ans: B
19. Least count of a Vernier metric micrometer is :
(A) 0.1 mm (B) 0.01 mm (C) 0.001 mm (D) 0.0001 mm
Ans: C
20. A chemical compound of carbon with iron is called :
(A) Ferrite (B) Cementite (C) Pearlite (D) Austenite
Ans: B
21. Hacksaw blades are made of :
(A) Low alloy steel and high speed steel (B) Medium carbon steel and stainless steel
(C) High carbon steel and stainless steel (D) Low carbon steel
Ans: A
22. The type of hacksaw frames in which more than one standard size blade can be fitted is called __________.
(A) Solid frame (B) Fixed frame (C) Adjustable frame (D) Tubular frame
Ans: C
23. The punching marks on the lines drawn during marking off are known as __________.
(A) Marking (B) Witness marking
(C) Drawing (D) Checking
Ans: B
24. The vice clamps are used to __________.
(A) Protect hard jaws (B) Clamp the work piece rigidly (C) Protect the finished surfaces (D) Prevent the movable jaw being filed
Ans: C
25. The size of an engineer’s vice is specified by the :
(A) Length of the movable jaw (B) Width of the jaw (C) Height of the vice (D) Maximum opening of the jaw
Ans: B
26. The part of the universal surface gauge which helps to draw the parallel line along the datum edge is the :
(A) Rocker arm (B) Snug (C) Fine adjustment screw (D) Guide pins
Ans: D
27. Scribers are made of :
(A) Mild steel (B) Brass (C) High carbon steel (D) Cast iron
Ans: C
28. The reference surface during marking is provided by the :
(A) Surface gauge (B) Work piece (C) Drawing of the work (D) Marking table surface
Ans: D
29. While cutting small diameter pipes, it is advisable to watch regularly and ensure that :
(A) More saw teeth are in contact
(B) The cut is along the curved line
(C) The work is not overheated
(D) Proper balancing of hacksaw is maintained
Ans: A
30. The copper-zinc alloys are known as :
(A) Bronzes (B) Brasses (C) Led (D) Zinc
Ans: B
31. The process of introducing carbon into low carbon steels in order to produce a hard surface is known as :
(A) Electroplating (B) Nitriding (C) Carburizing (D) Spraying
Ans: C
32. Pig iron refined in a cupola produces __________.
(A) Cast iron (B) Wrought iron (C) Steel (D) Stainless steel
Ans: A
33. Materials which do not contain iron is known as :
(A) Ferrous materials (B) Non-metals (C) Non-ferrous metals (D) Ceramic metals
Ans: C
34. Wrought iron is produced by :
(A) Pudding process (B) Bessemer convertor (C) Electric furnace (D) Cupola furnace
Ans: A
35. Which of the following is a ferrous material ?
(A) Zinc (B) Plastic (C) Silicon carbide (D) Iron
Ans: D
36. The process of bevelling the end of a hole is called :
(A) Reaming (B) Counter sinking
(C) Spot facing (D) Counter boring
Ans: B
37. The portion of the hammer which is not hardened is the :
(A) Face (B) Peen (C) Handle (D) Cheek
Ans: D
38. A drift is used for drilling machine is :
(A) Drawing a drill location
(B) Indexing chuck on spindle
(C) Removing the drill from the machine spindle
(D) Removing from broken drill from the work
Ans: C
39. Suitable cutting fluid for drilling mild steel in drilling machine is __________.
(A) Synthetic soluble oil (B) Distilled water (C) Kerosene (D) Soluble oil
Ans: D
40. The distance, which the cutting edge of a tool passes over the material in a minute, while machining, is known as :
(A) Cutting speed (B) Feed (C) Speed (D) RPM
Ans: A
41. The chisel will dig into the material when :
(A) The rake angle is more (B) The angle of inclination is more (C) The clearance angle is too low (D) The angle of inclination is too low
Ans: B
42. A slight convexity is given to cutting edge to :
(A) Cut curved surfaces (B) Cut sharp corners
(C) Prevent digging on the ends (D) Allow the lubricant to enter
Ans: C
43. The point angle for a standard drill is
(A) 1358 (B) 608 (C) 1088 (D) 1188
Ans: D
44. The part of a Vernier bevel protractor on which main scale divisions are marked is the :
(A) Stock (B) Dial
(C) Disc (D) Adjustable blades
Ans: C
(A) Low alloy steel and high speed steel (B) Medium carbon steel and stainless steel
(C) High carbon steel and stainless steel (D) Low carbon steel
Ans: A
22. The type of hacksaw frames in which more than one standard size blade can be fitted is called __________.
(A) Solid frame (B) Fixed frame (C) Adjustable frame (D) Tubular frame
Ans: C
23. The punching marks on the lines drawn during marking off are known as __________.
(A) Marking (B) Witness marking
(C) Drawing (D) Checking
Ans: B
24. The vice clamps are used to __________.
(A) Protect hard jaws (B) Clamp the work piece rigidly (C) Protect the finished surfaces (D) Prevent the movable jaw being filed
Ans: C
25. The size of an engineer’s vice is specified by the :
(A) Length of the movable jaw (B) Width of the jaw (C) Height of the vice (D) Maximum opening of the jaw
Ans: B
26. The part of the universal surface gauge which helps to draw the parallel line along the datum edge is the :
(A) Rocker arm (B) Snug (C) Fine adjustment screw (D) Guide pins
Ans: D
27. Scribers are made of :
(A) Mild steel (B) Brass (C) High carbon steel (D) Cast iron
Ans: C
28. The reference surface during marking is provided by the :
(A) Surface gauge (B) Work piece (C) Drawing of the work (D) Marking table surface
Ans: D
29. While cutting small diameter pipes, it is advisable to watch regularly and ensure that :
(A) More saw teeth are in contact
(B) The cut is along the curved line
(C) The work is not overheated
(D) Proper balancing of hacksaw is maintained
Ans: A
30. The copper-zinc alloys are known as :
(A) Bronzes (B) Brasses (C) Led (D) Zinc
Ans: B
31. The process of introducing carbon into low carbon steels in order to produce a hard surface is known as :
(A) Electroplating (B) Nitriding (C) Carburizing (D) Spraying
Ans: C
32. Pig iron refined in a cupola produces __________.
(A) Cast iron (B) Wrought iron (C) Steel (D) Stainless steel
Ans: A
33. Materials which do not contain iron is known as :
(A) Ferrous materials (B) Non-metals (C) Non-ferrous metals (D) Ceramic metals
Ans: C
34. Wrought iron is produced by :
(A) Pudding process (B) Bessemer convertor (C) Electric furnace (D) Cupola furnace
Ans: A
35. Which of the following is a ferrous material ?
(A) Zinc (B) Plastic (C) Silicon carbide (D) Iron
Ans: D
36. The process of bevelling the end of a hole is called :
(A) Reaming (B) Counter sinking
(C) Spot facing (D) Counter boring
Ans: B
37. The portion of the hammer which is not hardened is the :
(A) Face (B) Peen (C) Handle (D) Cheek
Ans: D
38. A drift is used for drilling machine is :
(A) Drawing a drill location
(B) Indexing chuck on spindle
(C) Removing the drill from the machine spindle
(D) Removing from broken drill from the work
Ans: C
39. Suitable cutting fluid for drilling mild steel in drilling machine is __________.
(A) Synthetic soluble oil (B) Distilled water (C) Kerosene (D) Soluble oil
Ans: D
40. The distance, which the cutting edge of a tool passes over the material in a minute, while machining, is known as :
(A) Cutting speed (B) Feed (C) Speed (D) RPM
Ans: A
41. The chisel will dig into the material when :
(A) The rake angle is more (B) The angle of inclination is more (C) The clearance angle is too low (D) The angle of inclination is too low
Ans: B
42. A slight convexity is given to cutting edge to :
(A) Cut curved surfaces (B) Cut sharp corners
(C) Prevent digging on the ends (D) Allow the lubricant to enter
Ans: C
43. The point angle for a standard drill is
(A) 1358 (B) 608 (C) 1088 (D) 1188
Ans: D
44. The part of a Vernier bevel protractor on which main scale divisions are marked is the :
(A) Stock (B) Dial
(C) Disc (D) Adjustable blades
Ans: C
45. The __________ is the narrow strip which extends to the entire length of the flutes.
(A) Shank (B) Web (C) Land/Margin (D) Body
Ans: C
46. The purpose of __________ is to restore the cutting action of the grinding wheel.
(A) Loading (B) Glazing (C) Truing (D) Dressing
Ans: D
47. An accuracy of a metric micrometer is __________.
(A) 0.1 mm (B) 0.01 mm (C) 0.02 mm (D) 0.001 mm
Ans: B
48. The accuracy of vernier bevel protractor is __________.
(A) One degree (B) One minute (C) Two minute (D) Five minute
Ans: D
49. In ‘v’ block included angle VEE is __________.
(A) 458 (B) 608 (C) 908 (D) 1208
Ans: C
50. __________ is used to check the gap between the mating parts.
(A) Feeler gauge (B) Plug gauge (C) Snap gauge (D) Gauge
Ans: A
(A) Shank (B) Web (C) Land/Margin (D) Body
Ans: C
46. The purpose of __________ is to restore the cutting action of the grinding wheel.
(A) Loading (B) Glazing (C) Truing (D) Dressing
Ans: D
47. An accuracy of a metric micrometer is __________.
(A) 0.1 mm (B) 0.01 mm (C) 0.02 mm (D) 0.001 mm
Ans: B
48. The accuracy of vernier bevel protractor is __________.
(A) One degree (B) One minute (C) Two minute (D) Five minute
Ans: D
49. In ‘v’ block included angle VEE is __________.
(A) 458 (B) 608 (C) 908 (D) 1208
Ans: C
50. __________ is used to check the gap between the mating parts.
(A) Feeler gauge (B) Plug gauge (C) Snap gauge (D) Gauge
Ans: A
51. In anvil round hole is called __________.
(A) Drawing down and cutting off (B) Hardie hole
(C) Bending to round shape (D) Punching hole
Ans: D
52. A welding rectifier is used to :
(A) Convert an A.C. welding supply into a D.C. supply
(B) Generate a D.C. welding supply
(C) Convert a D.C. welding supply into an A.C. welding
(D) Increase ampere
Ans: A
53. Testing a weld without damaging the joint is called __________.
(A) Destructive testing (B) Non-destructive testing
(C) Chemical testing (D) Non-chemical testing
Ans: B
54. In a lathe machine internal and external taper turning can be done by :
(A) Offsetting the tailstock
(B) A combination of both the cross-slide and the compound slide
(C) Swivelling the compound slide
(D) Form tool method
Ans: C
55. When a tool is set above the centre line of a lathe ?
(A) Front clearance decreases
(B) Front clearance increases
(C) Front clearance does not change
(D) Front clearance becomes equal to the side clearance
Ans: A
56. A sine bar is used for :
(A) Levelling the job for drilling (B) Finding the angle of a taper job
(C) Measuring the diameter of holes (D) Checking the profile of a thread
Ans: B
57. A __________ is used for bringing the jobs close to the finishing size.
(A) Bastard file (B) Second cut file
(C) Smooth file (D) Dead smooth file
Ans: B
58. The external threads on G.I. pipes are cut easily by :
(A) Tap sets (B) Dies and die stocks
(C) Thread rollers (D) Centre lathe
Ans: B
59. __________ is the mass per unit volume of a fluid.
(A) Density (B) Viscosity (C) Specific volume (D) Specific gravity
Ans: A
60. __________ at a point is the force per unit area.
(A) Compressibility (B) Viscosity (C) Pressure (D) Strain
Ans: C
61. Files are made of :
(A) Cast iron (B) Wrought iron
(C) Medium carbon steel (D) High carbon steel
Ans: D
62. Momentum of a body is given by :
(A) Mass×velocity (B) Mass×acceleration
(C) Moment×distance (D) Mass×change of velocity
Ans: A
63. Watt is the unit of :
(A) Force (B) Velocity (C) Work (D) Power
Ans: D
64. One metric horse power is equal to :
(A) 746 watts (B) 736 watts (C) 536 watts (D) 636 watts
Ans: B
65. __________ states that for material loaded within elastic limits, the stress is proportional to strain, produced by stress.
(A) Hooke’s law (B) Plank’s law (C) Euler’s law (D) Fleming’s law
Ans: A
66. In a riveted joint the tensile, shearing and crushing stresses are based on the :
(A) Material size
(B) Diameter of rivet
(C) Mean of the diameter of rivet and drilled hole
(D) Diameter of drilled hole
Ans: B
67. A welded joint as compared to riveted joint, has :
(A) Less strength (B) More strength
(C) Equal strength (D) Comparisons not required
Ans: B
68. The radial distance of the tooth above pitch circle is called __________.
(A) Dedendum (B) Pitch (C) Addendum (D) Diameter
Ans: C
69. The point of contact of two pitch circles of mating gears is called :
(A) Circular pitch (B) Module (C) Pitch point (D) Addendum
Ans: C
70. Difference between the upper limits and lower limit of deviation is called :
(A) Allowance (B) Tolerance (C) Interference (D) Basic size
Ans: B
71. Fluid mechanic deals with the behaviour of the __________.
(A) Liquids or gases (B) Solid or gases
(C) Semi solid or gases (D) Half solid or gases
Ans: A
72. The copper tin alloys are known as :
(A) Brasses (B) Lead (C) Zinc (D) Bronzes
Ans: D
73. If the metals are ductile and cutting speeds are high, then :
(A) Continuous chips are formed
(B) Discontinuous chips are formed
(C) Continuous chips with built-up edge are formed
(D) Discontinuous chips with built-up edge are formed
Ans: A
74. The ability of a tool material to resist shock or impact forces is known as __________.
(A) Wear resistance (B) Hardness (C) Toughness (D) Machinability
Ans: C
75. The device, which holds and locates a work piece and guides and controls one or more cutting tools, known as __________.
(A) Fixture (B) Jig (C) Lathe (D) Templates
Ans: B
76. A diamond pointed chisel is used for cutting :
(A) Grooves (B) Keyways (C) V shaped grooves (D) Flat surfaces
Ans: C
77. The grain structure is defined in :
(A) Cold working process (B) Hot working process (C) Air blasting process (D) None of the above
Ans: B
78. EDM stands for :
(A) Electro discharge machining (B) Energy discharge method (C) Energy direct method (D) Efficient direct method
Ans: A
79. For cutting operation, the most suitable flame is __________.
(A) Neutral (B) Oxidizing flame (C) Carburizing flame (D) None of the above
Ans: A
80. Following which material flux is not used for welding ?
(A) Copper (B) Brass (C) Bronze (D) Carbon steel
Ans: D
81. The included angle for Acme thread is :
(A) 608 (B) 458 (C) 298 (D) 558
Ans: C
82. M 30×2 for a bolt represents :
(A) Metric threads of 30 mm outside diameter and 2 mm pitch
(B) Metric threads of 60 mm 2 cross sectional area
(C) Metric threads on a bolt of length 30 mm
(D) Mild steel threads on 30 mm
Ans: A
83. Within the elastic limit in a loaded material, stress is :
(A) Inversely proportional to strain (B) Directly proportional to strain
(C) Elasticity (D) Plasticity
Ans: B
84. The largest permissible size for a dimension is known as :
(A) Lower limit (B) Basic size (C) Actual size (D) Upper limit
Ans: D
85. The system said to be bilateral tolerance if :
(A) Tolerance is positive (B) Tolerance is in one direction (C) Tolerance is in two direction (D) Tolerance is negative
Ans: C
86. The notation 70H6/g5 means :
(A) Basic size is 70 mm and tolerance grade of hole is 6 and shaft is 5
(B) Basic size is 70 mm and tolerance grade of shaft is 6 and hole is 5
(C) Basic size is 70 mm
(D) Actual size is 70 mm
Ans: A
87. The two plates are to be jointed by rivets. The plates are touching each other and two cover plates are placed on both sides of the main plates and then riveted. This type of joint is known as :
(A) Lap joint
(B) Butt joint
(C) Single strap joint
(D) Double strap butt joint
Ans: D
88. Which material having highest melting point ?
(A) Tungsten (B) Manganese (C) Copper (D) Diamond
Ans: A
89. Bar is the unit of :
(A) Power (B) Energy (C) Pressure (D) Work
Ans: C
90. __________ is the process of heat transfer from a hot body to cold body without effecting the medium.
(A) Radiation (B) Conduction (C) Convection (D) Convection and conduction
Ans: A
(A) Drawing down and cutting off (B) Hardie hole
(C) Bending to round shape (D) Punching hole
Ans: D
52. A welding rectifier is used to :
(A) Convert an A.C. welding supply into a D.C. supply
(B) Generate a D.C. welding supply
(C) Convert a D.C. welding supply into an A.C. welding
(D) Increase ampere
Ans: A
53. Testing a weld without damaging the joint is called __________.
(A) Destructive testing (B) Non-destructive testing
(C) Chemical testing (D) Non-chemical testing
Ans: B
54. In a lathe machine internal and external taper turning can be done by :
(A) Offsetting the tailstock
(B) A combination of both the cross-slide and the compound slide
(C) Swivelling the compound slide
(D) Form tool method
Ans: C
55. When a tool is set above the centre line of a lathe ?
(A) Front clearance decreases
(B) Front clearance increases
(C) Front clearance does not change
(D) Front clearance becomes equal to the side clearance
Ans: A
56. A sine bar is used for :
(A) Levelling the job for drilling (B) Finding the angle of a taper job
(C) Measuring the diameter of holes (D) Checking the profile of a thread
Ans: B
57. A __________ is used for bringing the jobs close to the finishing size.
(A) Bastard file (B) Second cut file
(C) Smooth file (D) Dead smooth file
Ans: B
58. The external threads on G.I. pipes are cut easily by :
(A) Tap sets (B) Dies and die stocks
(C) Thread rollers (D) Centre lathe
Ans: B
59. __________ is the mass per unit volume of a fluid.
(A) Density (B) Viscosity (C) Specific volume (D) Specific gravity
Ans: A
60. __________ at a point is the force per unit area.
(A) Compressibility (B) Viscosity (C) Pressure (D) Strain
Ans: C
61. Files are made of :
(A) Cast iron (B) Wrought iron
(C) Medium carbon steel (D) High carbon steel
Ans: D
62. Momentum of a body is given by :
(A) Mass×velocity (B) Mass×acceleration
(C) Moment×distance (D) Mass×change of velocity
Ans: A
63. Watt is the unit of :
(A) Force (B) Velocity (C) Work (D) Power
Ans: D
64. One metric horse power is equal to :
(A) 746 watts (B) 736 watts (C) 536 watts (D) 636 watts
Ans: B
65. __________ states that for material loaded within elastic limits, the stress is proportional to strain, produced by stress.
(A) Hooke’s law (B) Plank’s law (C) Euler’s law (D) Fleming’s law
Ans: A
66. In a riveted joint the tensile, shearing and crushing stresses are based on the :
(A) Material size
(B) Diameter of rivet
(C) Mean of the diameter of rivet and drilled hole
(D) Diameter of drilled hole
Ans: B
67. A welded joint as compared to riveted joint, has :
(A) Less strength (B) More strength
(C) Equal strength (D) Comparisons not required
Ans: B
68. The radial distance of the tooth above pitch circle is called __________.
(A) Dedendum (B) Pitch (C) Addendum (D) Diameter
Ans: C
69. The point of contact of two pitch circles of mating gears is called :
(A) Circular pitch (B) Module (C) Pitch point (D) Addendum
Ans: C
70. Difference between the upper limits and lower limit of deviation is called :
(A) Allowance (B) Tolerance (C) Interference (D) Basic size
Ans: B
71. Fluid mechanic deals with the behaviour of the __________.
(A) Liquids or gases (B) Solid or gases
(C) Semi solid or gases (D) Half solid or gases
Ans: A
72. The copper tin alloys are known as :
(A) Brasses (B) Lead (C) Zinc (D) Bronzes
Ans: D
73. If the metals are ductile and cutting speeds are high, then :
(A) Continuous chips are formed
(B) Discontinuous chips are formed
(C) Continuous chips with built-up edge are formed
(D) Discontinuous chips with built-up edge are formed
Ans: A
74. The ability of a tool material to resist shock or impact forces is known as __________.
(A) Wear resistance (B) Hardness (C) Toughness (D) Machinability
Ans: C
75. The device, which holds and locates a work piece and guides and controls one or more cutting tools, known as __________.
(A) Fixture (B) Jig (C) Lathe (D) Templates
Ans: B
76. A diamond pointed chisel is used for cutting :
(A) Grooves (B) Keyways (C) V shaped grooves (D) Flat surfaces
Ans: C
77. The grain structure is defined in :
(A) Cold working process (B) Hot working process (C) Air blasting process (D) None of the above
Ans: B
78. EDM stands for :
(A) Electro discharge machining (B) Energy discharge method (C) Energy direct method (D) Efficient direct method
Ans: A
79. For cutting operation, the most suitable flame is __________.
(A) Neutral (B) Oxidizing flame (C) Carburizing flame (D) None of the above
Ans: A
80. Following which material flux is not used for welding ?
(A) Copper (B) Brass (C) Bronze (D) Carbon steel
Ans: D
81. The included angle for Acme thread is :
(A) 608 (B) 458 (C) 298 (D) 558
Ans: C
82. M 30×2 for a bolt represents :
(A) Metric threads of 30 mm outside diameter and 2 mm pitch
(B) Metric threads of 60 mm 2 cross sectional area
(C) Metric threads on a bolt of length 30 mm
(D) Mild steel threads on 30 mm
Ans: A
83. Within the elastic limit in a loaded material, stress is :
(A) Inversely proportional to strain (B) Directly proportional to strain
(C) Elasticity (D) Plasticity
Ans: B
84. The largest permissible size for a dimension is known as :
(A) Lower limit (B) Basic size (C) Actual size (D) Upper limit
Ans: D
85. The system said to be bilateral tolerance if :
(A) Tolerance is positive (B) Tolerance is in one direction (C) Tolerance is in two direction (D) Tolerance is negative
Ans: C
86. The notation 70H6/g5 means :
(A) Basic size is 70 mm and tolerance grade of hole is 6 and shaft is 5
(B) Basic size is 70 mm and tolerance grade of shaft is 6 and hole is 5
(C) Basic size is 70 mm
(D) Actual size is 70 mm
Ans: A
87. The two plates are to be jointed by rivets. The plates are touching each other and two cover plates are placed on both sides of the main plates and then riveted. This type of joint is known as :
(A) Lap joint
(B) Butt joint
(C) Single strap joint
(D) Double strap butt joint
Ans: D
88. Which material having highest melting point ?
(A) Tungsten (B) Manganese (C) Copper (D) Diamond
Ans: A
89. Bar is the unit of :
(A) Power (B) Energy (C) Pressure (D) Work
Ans: C
90. __________ is the process of heat transfer from a hot body to cold body without effecting the medium.
(A) Radiation (B) Conduction (C) Convection (D) Convection and conduction
Ans: A
91. External equalizer is used with _________
(A) AEV (B) TEV (C) High side flat valve (D) Low side flat valve
Ans: B
92. Normally pressure relief valves are mounted on _________ in a refrigeration plant.
(A) compressor (B) receiver (C) condenser (D) evaporator
Ans: B
93. The best refrigerant is one for which _________.
(A) ODP = 1 (B) ODP = 0.5 (C) ODP = 0.75 (D) ODP = 0
Ans: D
94. Relative COP = _________
(A) Actual COP / Theoretical COP (B) Theoretical COP / Actual COP (C) Actual COP · Theoretical COP (D) None of these
Ans: A
95. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called
(A) Sub-cooling (B) Super-cooling (C) Normal cooling (D) None of these
Ans: A
96. On P-H diagram, the isentropic compression process is represented by an
(A) Inclined line (B) Vertical line (C) Horizontal line (D) Curved line
Ans: D
97. The super-heating in a refrigeration cycle
(A) Does not alter COP (B) Increase COP (C) Decrease COP (D) None of these
Ans: C
98. How many numbers of orbits in the orbiting scroll of scroll compression process ?
(A) Three (B) Four (C) Two (D) One
Ans: B
99. Most air cooled condensers are designed to operate with a temperature difference of
(A) 6 C (B) 9 C (C) 14 C (D) 24 C
Ans: C
100. The centrifugal compressor are generally used for refrigerants that require
(A) small displacements and low condensing pressure.
(B) large displacements and high condensing pressure.
(C) small displacements and high condensing pressure.
(D) large displacements and low condensing pressure.
Ans: D
(A) AEV (B) TEV (C) High side flat valve (D) Low side flat valve
Ans: B
92. Normally pressure relief valves are mounted on _________ in a refrigeration plant.
(A) compressor (B) receiver (C) condenser (D) evaporator
Ans: B
93. The best refrigerant is one for which _________.
(A) ODP = 1 (B) ODP = 0.5 (C) ODP = 0.75 (D) ODP = 0
Ans: D
94. Relative COP = _________
(A) Actual COP / Theoretical COP (B) Theoretical COP / Actual COP (C) Actual COP · Theoretical COP (D) None of these
Ans: A
95. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called
(A) Sub-cooling (B) Super-cooling (C) Normal cooling (D) None of these
Ans: A
96. On P-H diagram, the isentropic compression process is represented by an
(A) Inclined line (B) Vertical line (C) Horizontal line (D) Curved line
Ans: D
97. The super-heating in a refrigeration cycle
(A) Does not alter COP (B) Increase COP (C) Decrease COP (D) None of these
Ans: C
98. How many numbers of orbits in the orbiting scroll of scroll compression process ?
(A) Three (B) Four (C) Two (D) One
Ans: B
99. Most air cooled condensers are designed to operate with a temperature difference of
(A) 6 C (B) 9 C (C) 14 C (D) 24 C
Ans: C
100. The centrifugal compressor are generally used for refrigerants that require
(A) small displacements and low condensing pressure.
(B) large displacements and high condensing pressure.
(C) small displacements and high condensing pressure.
(D) large displacements and low condensing pressure.
Ans: D
· UPSC Exam Syllabus- Mechanical Engineering
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