MCQOPTIONS
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MCQOPTIONS
This section includes 800 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The negative rake is usually provided on |
| A. | High carbon steel tools |
| B. | High speed steel tools |
| C. | Cemented carbide tools |
| D. | All of these |
| Answer» D. All of these | |
| 52. |
For harder alloy steel, the point angle of the drill is kept |
| A. | Equal to 118° |
| B. | Less than 118° |
| C. | More than 118° |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 53. |
For softer materials, the point angle of the drill is kept |
| A. | Equal to 118° |
| B. | Less than 118° |
| C. | More than 118° |
| D. | Any one of these |
| Answer» C. More than 118° | |
| 54. |
If the cutting speed is increased, then the built-up-edge |
| A. | Becomes longer |
| B. | May or may not form |
| C. | Becomes smaller and finally does not form at all |
| D. | Has nothing to do with speed |
| Answer» D. Has nothing to do with speed | |
| 55. |
Which of the following parameters influence the axial feed rate in centerless grinding? |
| A. | Regulating wheel diameter |
| B. | Speed of the regulating wheel |
| C. | Angle between the axes of grinding and regulating wheels |
| D. | All of the above |
| Answer» E. | |
| 56. |
Crater wear leads to |
| A. | Increase in cutting temperature |
| B. | Weakening of tool |
| C. | Friction and cutting forces |
| D. | All of these |
| Answer» E. | |
| 57. |
A drill mainly used in drilling brass, copper or softer materials, is |
| A. | Flat drill |
| B. | Straight fluted drill |
| C. | Parallel shank twist drill |
| D. | Tapered shank twist drill |
| Answer» C. Parallel shank twist drill | |
| 58. |
In drilling operation, the metal is removed by |
| A. | Shearing |
| B. | Extrusion |
| C. | Shearing and extrusion |
| D. | Shearing and compression |
| Answer» D. Shearing and compression | |
| 59. |
In a plain milling cutter, the chip space between the back of one tooth and the face of the next tooth is called |
| A. | Face |
| B. | Fillet |
| C. | Gash |
| D. | Land |
| Answer» D. Land | |
| 60. |
The lip angle of a single point tool is usually |
| A. | 20° to 40° |
| B. | 40° to 60° |
| C. | 60° to 80° |
| D. | None of these |
| Answer» D. None of these | |
| 61. |
The material property which depends only on the basic crystal structure is |
| A. | Fatigue strength |
| B. | Work hardening |
| C. | Fracture strength |
| D. | Elastic constant |
| Answer» D. Elastic constant | |
| 62. |
The cutting speed is minimum while machining _________ with a high speed steel tool. |
| A. | Cast iron |
| B. | Mild steel |
| C. | Brass |
| D. | Aluminium |
| Answer» B. Mild steel | |
| 63. |
Thread grinding requires work speed from |
| A. | 1 to 3 m/min |
| B. | 5 to 10 m/min |
| C. | 10 to 14 m/min |
| D. | 14 to 20 m/min |
| Answer» B. 5 to 10 m/min | |
| 64. |
What is the name of the device used in arc welding circuits for the purpose of modifying the rate of current change when the weld road is varied rapidly? |
| A. | Reactor |
| B. | Kerf |
| C. | Inductor |
| D. | Cone |
| Answer» D. Cone | |
| 65. |
The grinding of long, slender shafts or bars is usually done by |
| A. | In-feed grinding |
| B. | Through feed grinding |
| C. | End-feed grinding |
| D. | Any one of these |
| Answer» C. End-feed grinding | |
| 66. |
A ring gauge is used to measure |
| A. | Outside diameter but not roundness |
| B. | Roundness but not outside diameter |
| C. | Both outside diameter and roundness |
| D. | Only external threads |
| Answer» B. Roundness but not outside diameter | |
| 67. |
The operation of making a cone-shaped enlargement of the end of a hole is known as |
| A. | Counter-sinking |
| B. | Counter-boring |
| C. | Trepanning |
| D. | Spot facing |
| Answer» B. Counter-boring | |
| 68. |
The operation of smoothing and squaring the surface around a hole is known as |
| A. | Counter-sinking |
| B. | Counter-boring |
| C. | Trepanning |
| D. | Spot facing |
| Answer» E. | |
| 69. |
The snag grinding is done |
| A. | To produce good surface finish and high degree of accuracy |
| B. | To remove considerable amount of metal without regard to accuracy of the finished surface |
| C. | To grind exterior cylindrical surfaces |
| D. | Any one of the above |
| Answer» C. To grind exterior cylindrical surfaces | |
| 70. |
A better machinable metal is one which gives |
| A. | Lower chip-tool contact area and larger shear angle |
| B. | Higher chip-tool contact area and smaller shear angle |
| C. | Lower chip-tool contact area and smaller shear angle |
| D. | Higher chip-tool contact area and larger shear angle |
| Answer» B. Higher chip-tool contact area and smaller shear angle | |
| 71. |
The different spindle speeds on a lathe form |
| A. | Arithmetical progression |
| B. | Geometrical progression |
| C. | Harmonical progression |
| D. | Any one of these |
| Answer» C. Harmonical progression | |
| 72. |
Tool life is measured by the |
| A. | Number of pieces machined between tool sharpenings |
| B. | Time the tool is in contact with the job |
| C. | Volume of material removed between tool sharpenings |
| D. | All of the above |
| Answer» E. | |
| 73. |
The percentage of carbon in gray cast iron is in the range of |
| A. | 0.25 to 0.75 percent |
| B. | 1.25 to 1.75 percent |
| C. | 3 to 4 percent |
| D. | 8 to 10 percent |
| Answer» D. 8 to 10 percent | |
| 74. |
Which of the following parameters govern the value of shear angle in continuous chip formation? |
| A. | True feed |
| B. | Chip thickness |
| C. | Rake angle of the cutting tool |
| D. | All of these |
| Answer» E. | |
| 75. |
Ultrasonic machining is best suited for |
| A. | Tool steels |
| B. | Sintered carbides |
| C. | Glass |
| D. | All of these |
| Answer» E. | |
| 76. |
Quality screw threads are produced by |
| A. | Thread milling |
| B. | Thread chasing |
| C. | Thread cutting with single point tool |
| D. | Thread casting |
| Answer» E. | |
| 77. |
Threading is an operation of |
| A. | Smoothing and squaring the surface around a hole |
| B. | Sizing and finishing a small diameter hole |
| C. | Producing a hole by removing metal along the circumference of a hollow cutting tool |
| D. | Cutting helical grooves on the external cylindrical surface |
| Answer» E. | |
| 78. |
The grooving is an operation of |
| A. | Beveling the extreme end of a workpiece |
| B. | Embossing a diamond shaped pattern on the surface of a workpiece |
| C. | Reducing the diameter of a workpiece over a very narrow surface |
| D. | Enlarging the end of a hole cylindrically |
| Answer» D. Enlarging the end of a hole cylindrically | |
| 79. |
The chamfering is an operation of |
| A. | Beveling the extreme end of a workpiece |
| B. | Embossing a diamond shaped pattern on the surface of a workpiece |
| C. | Reducing the diameter of a workpiece over a very narrow surface |
| D. | Enlarging the end of a hole cylindrically |
| Answer» B. Embossing a diamond shaped pattern on the surface of a workpiece | |
| 80. |
The saw milling is an operation of |
| A. | Producing grooves around the periphery of a cylindrical or conical workpiece |
| B. | Producing narrow slots or grooves on a workpiece |
| C. | Reproduction of an outline of a template on a workpiece |
| D. | Machining several surfaces of a workpiece simultaneously |
| Answer» C. Reproduction of an outline of a template on a workpiece | |
| 81. |
Lapping is an operation of |
| A. | Making a cone-shaped enlargement of the end of a hole |
| B. | Smoothing and squaring the surface around a hole |
| C. | Sizing and finishing a small diameter hole |
| D. | Producing a hole by removing metal along the circumference of a hollow cutting tool |
| Answer» D. Producing a hole by removing metal along the circumference of a hollow cutting tool | |
| 82. |
The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min. |
| A. | Mild steel |
| B. | Copper |
| C. | Aluminium |
| D. | Brass |
| Answer» B. Copper | |
| 83. |
The broaching operation in which the work moves past the stationary tool is called |
| A. | Pull broaching |
| B. | Push broaching |
| C. | Surface broaching |
| D. | Continuous broaching |
| Answer» E. | |
| 84. |
What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called? |
| A. | Porosity |
| B. | Undercut |
| C. | Under fill |
| D. | Crack |
| Answer» C. Under fill | |
| 85. |
Internal gears can be made by |
| A. | Hobbing |
| B. | Shaping with pinion cutter |
| C. | Shaping with rack cutter |
| D. | Milling |
| Answer» C. Shaping with rack cutter | |
| 86. |
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm. |
| A. | 2.17 rpm, 600 joules |
| B. | 6.8 rpm, 6 joules |
| C. | 5.03 rpm, 600 joules |
| D. | 22 rpm, 600 joules |
| Answer» B. 6.8 rpm, 6 joules | |
| 87. |
The operation of producing grooves around the periphery of a cylindrical or conical workpiece is called |
| A. | Profile milling |
| B. | Gang milling |
| C. | Saw milling |
| D. | Helical milling |
| Answer» E. | |
| 88. |
Continuous chips with built up edge are formed during machining of |
| A. | Brittle metals |
| B. | Ductile metals |
| C. | Hard metals |
| D. | Soft metals |
| Answer» C. Hard metals | |
| 89. |
Discontinuous chips are formed during machining of |
| A. | Brittle metals |
| B. | Ductile metals |
| C. | Hard metals |
| D. | Soft metals |
| Answer» B. Ductile metals | |
| 90. |
The cutting speed for drilling copper with high speed steel drills varies from |
| A. | 10 to 20 m/min |
| B. | 18 to 30 m/min |
| C. | 24 to 45 m/min |
| D. | 60 to 90 m/min |
| Answer» C. 24 to 45 m/min | |
| 91. |
Twist drills are made of |
| A. | High speed steel |
| B. | Carbon steel |
| C. | Stainless steel |
| D. | Either (A) or (B) |
| Answer» E. | |
| 92. |
In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate |
| A. | Increases continuously |
| B. | Decreases continuously |
| C. | Decreases becomes stable and then increases |
| D. | Increases, becomes stable and then decreases |
| Answer» E. | |
| 93. |
The effective number of lattice points in the unit cell of simple cubic, body centered cubic, and face centered cubic space lattices, respectively, are |
| A. | 1, 2, 2 |
| B. | 1, 2, 4 |
| C. | 2, 3, 4 |
| D. | 2, 4, 4 |
| Answer» C. 2, 3, 4 | |
| 94. |
In ECM, the material removal is due to |
| A. | Corrosion |
| B. | Erosion |
| C. | Fusion |
| D. | Ion displacement |
| Answer» E. | |
| 95. |
The drill spindles are provided with standard taper known as |
| A. | Morse taper |
| B. | Seller's taper |
| C. | Chapman taper |
| D. | Brown and Sharpe taper |
| Answer» B. Seller's taper | |
| 96. |
High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools. |
| A. | 2 to 3 times lower |
| B. | 2 to 3 times higher |
| C. | 5 to 8 times higher |
| D. | 8 to 20 times higher |
| Answer» C. 5 to 8 times higher | |
| 97. |
Tool life is generally better when |
| A. | Grain size of the metal is large |
| B. | Grain size of the metal is small |
| C. | Hard constituents are present in the micro-structure of the tool material |
| D. | None of the above |
| Answer» B. Grain size of the metal is small | |
| 98. |
The helix angle of a drill is __________ for drilling brass. |
| A. | Equal to 30° |
| B. | Less than 30° |
| C. | More than 30° |
| D. | None of these |
| Answer» C. More than 30° | |
| 99. |
Calculate the weld per minute, work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz. |
| A. | 3000 welds/min, 75 mm/min |
| B. | 600 welds/min, 1500 mm/min |
| C. | 500 welds/min, 1250 mm/min |
| D. | 22 welds/min, 55 mm/min |
| Answer» C. 500 welds/min, 1250 mm/min | |
| 100. |
A grinding wheel becomes glazed (i.e. cutting edge takes a glass-like appearance) due to |
| A. | Wear of bond |
| B. | Breaking of abrasive grains |
| C. | Wear of abrasive grains |
| D. | Cracks on grinding wheel |
| Answer» D. Cracks on grinding wheel | |