MCQOPTIONS
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MCQOPTIONS
This section includes 149 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is __________ cutting speed for drilling mild steel with high speed steel drills. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» B. less than | |
| 52. |
The cutting speed of a drill varies from point to point on the cutting edge of the drill. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 53. |
In twist fluted drills, chips do not move out automatically. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 54. |
The helix angle of a drill is more than 30° for drilling aluminium. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 55. |
In drilling bakellite and fibrous plastics, the point angle of a drill is |
| A. | 90° |
| B. | 118° |
| C. | 135° |
| D. | 150° |
| Answer» B. 118° | |
| 56. |
In drilling mild steel and brass, the point angle of a drill is 118°. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 57. |
If the helix angle of the drill is made __________ 30°, then the torque required to drive the drill at a given feed will be more. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» C. more than | |
| 58. |
The rake angle of a single point cutting tool corresponds to __________ of a twist drill. |
| A. | lip clearance angle |
| B. | helix angle |
| C. | point angle |
| D. | chisel edge angle |
| Answer» C. point angle | |
| 59. |
The lip clearance angle should decrease towards the centre of the drill than at the circumference. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 60. |
The chisel edge angle of a drill is usually 120° to 135°. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 61. |
The cutting speed for counter-boring should be __________ that of drilling operation. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 62. |
The hole drilled for tapping should be smaller than the tap size by twice the depth of thread. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 63. |
Spot facing is an operation of smoothing and squaring the surface around a hole. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 64. |
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 | |
| 65. |
The cutting speed is maximum while machining __________ with a high speed steel tool. |
| A. | cast iron |
| B. | mild steel |
| C. | brass |
| D. | aluminium |
| Answer» E. | |
| 66. |
A round nose tool has no back rake and side rake. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 67. |
The width of cutting edge of a parting-off tool varies from |
| A. | 3 to 12 mm |
| B. | 5 to 20 mm |
| C. | 8 to 30 mm |
| D. | 15 to 40 mm |
| Answer» B. 5 to 20 mm | |
| 68. |
An operation of enlarging the end of a hole cylindrically is known as grooving. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 69. |
In case of turning, as the machining proceeds, the spindle speed must __________ with the decrease in diameter of work. |
| A. | decrease |
| B. | increase |
| Answer» C. | |
| 70. |
The guideways are of |
| A. | flat type |
| B. | V-type |
| C. | dovetail type |
| D. | any one of these |
| Answer» E. | |
| 71. |
A lathe with four steps on the cone pulley and with backgears will have |
| A. | four direct speeds |
| B. | four indirect speeds |
| C. | four direct and four indirect speeds |
| D. | eight indirect speeds |
| Answer» D. eight indirect speeds | |
| 72. |
The tail stock and the carriage of a lathe may be guided on same or different guideway. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 73. |
When the backgear is engaged in a backgeared headstock, the spindle speed reduces considerably. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 74. |
The tailstock set over required to turn a taper on the entire length of a workpiece having diameters D and d is |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | D - d |
| Answer» D. D - d | |
| 75. |
Half nut is used to lock the lathe carriage to the lead screw for thread cutting. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 76. |
The swing diameter over carriage is always less than the swing diameter over bed. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 77. |
The swing diameter over the bed is __________ the height of the centre measured from the bed of the lathe. |
| A. | equal to |
| B. | twice |
| C. | thrice |
| D. | one-half |
| Answer» C. thrice | |
| 78. |
In a centre lathe, the cutting tool is fed in __________ with reference to the lathe axis. |
| A. | cross direction only |
| B. | longitudinal direction only |
| C. | both cross and longitudinal direction |
| D. | any direction |
| Answer» D. any direction | |
| 79. |
The tool life is __________ cutting speed. |
| A. | independent of |
| B. | dependant upon |
| Answer» C. | |
| 80. |
In the relation VTn = C, the value of n for high speed steel tools varies from 0.25 to 0.40. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 81. |
As the cutting speed increases, tool life decreases. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 82. |
If the grain size is __________ the tool life is better. |
| A. | smaller |
| B. | larger |
| Answer» C. | |
| 83. |
The tool life, in case of continuous cutting, is much better than intermittent cutting. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 84. |
Cutting fluid has no effect on the tool life. |
| A. | True |
| B. | False |
| Answer» C. | |
| 85. |
The tool life __________ as the cutting speed increases. |
| A. | decreases |
| B. | increases |
| Answer» B. increases | |
| 86. |
A numerical method of identification of tool is known as tool signature. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 87. |
Ceramic tools has greater tool life than carbide tools. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 88. |
Stellite preserve hardness upto a temperature of |
| A. | 350°C |
| B. | 500°C |
| C. | 900°C |
| D. | 1100°C |
| Answer» E. | |
| 89. |
The trade name of a non-ferrous cast alloy composed of cobalt, chromium and tungsten is called |
| A. | ceramic |
| B. | stellite |
| C. | diamond |
| D. | cemented carbide |
| Answer» C. diamond | |
| 90. |
High speed steel tools retain their hardness upto a temperature of |
| A. | 250°C |
| B. | 350°C |
| C. | 500°C |
| D. | 900°C |
| Answer» E. | |
| 91. |
Carbon tool steels have low-heat and wear-resistance. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 92. |
In machining soft materials, a tool with negative relief angle is used. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 93. |
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 | |
| 94. |
The increase in depth of cut and feed rate __________ surface finish. |
| A. | improves |
| B. | deteriorates |
| C. | does not effect |
| Answer» C. does not effect | |
| 95. |
If the shear angle is large and the chip-tool contact area is low, then the tool life will be more. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 96. |
When the shear angle is large |
| A. | path of shear is short and chip is thin |
| B. | path of shear is large and chip is thick |
| C. | path of shear is short and chip is thick |
| D. | path of shear is large and chip is thin |
| Answer» B. path of shear is large and chip is thick | |
| 97. |
Flank wear is due to the abrasive action of hard mis-constituents including debris from built up edge as the work material rubs the work surface. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 98. |
The thrust force will increase with the increase in |
| A. | side cutting edge angle |
| B. | tool nose radius |
| C. | rake angle |
| D. | end cutting edge angle |
| Answer» B. tool nose radius | |
| 99. |
In order to prevent tool from rubbing the work __________ on tools are provided. |
| A. | rake angles |
| B. | relief angles |
| Answer» C. | |
| 100. |
Back rake angle of a single point tool is the angle by which the face of the tool is inclined towards back. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |