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This section includes 180 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. |
Low helix angle drills are preferred for drilling holes in |
A. | plastics |
B. | copper |
C. | cast steel |
D. | carbon steel |
Answer» B. copper | |
52. |
The grinding of long, slender shafts or bars is usually done by |
A. | infeed grinding |
B. | through feed grinding |
C. | endfeed grinding |
D. | any one of these |
Answer» C. endfeed grinding | |
53. |
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. | |
54. |
Soft materials can not be economically ground due to |
A. | high temperature involved |
B. | frequent wheel clogging |
C. | rapid wheel wear |
D. | low work piece stiffness |
Answer» C. rapid wheel wear | |
55. |
The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece, is called |
A. | up milling |
B. | down milling |
C. | face milling |
D. | end milling |
Answer» C. face milling | |
56. |
In machining metal, cutting force at the cutting edge is measured by a |
A. | wattmeter |
B. | dynamometer |
C. | hydrometer |
D. | pyrometer |
Answer» C. hydrometer | |
57. |
With the same tool life, the maximum material per minute is removed by |
A. | increasing the cutting speed |
B. | decreasing the cutting speed |
C. | increasing the depth of cut |
D. | increasing the feed rate |
Answer» D. increasing the feed rate | |
58. |
A feed gear box for a screw cutting lathe is designed on the basis of |
A. | geometric progression |
B. | arithmetic progression |
C. | harmonic progression |
D. | none of these |
Answer» B. arithmetic progression | |
59. |
The grinding wheel speed (surface speed in m/min) usually varies from |
A. | 500 to 1000 |
B. | 1000 to 1500 |
C. | 1500 to 2000 |
D. | 2000 to 2500 |
Answer» D. 2000 to 2500 | |
60. |
The factor responsible for the formation of discontinuous chips is |
A. | low cutting speed and large rake angle |
B. | low cutting speed and small rake angle |
C. | high cutting speed and large rake angle |
D. | high cutting speed and small rake angle |
Answer» C. high cutting speed and large rake angle | |
61. |
It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be |
A. | 10 r.p.m. |
B. | 20 r.p.m. |
C. | 120 r.p.m. |
D. | 180 r.p.m. |
Answer» C. 120 r.p.m. | |
62. |
The tool life in case of a grinding wheel is the time |
A. | between two successive regrinds of the wheel |
B. | taken for the wheel to be balanced |
C. | taken between two successive wheel dressings |
D. | taken for a wear of 1 mm on its diameter |
Answer» D. taken for a wear of 1 mm on its diameter | |
63. |
In which of the following machine, the work is usually rotated while the drill is fed into work? |
A. | Sensitive drilling machine |
B. | Radial drilling machine |
C. | Gang drilling machine |
D. | Deep hole drilling machine |
Answer» E. | |
64. |
The tool may fail due to |
A. | cracking at the cutting edge due to thermal stresses |
B. | chipping of the cutting edge |
C. | plastic deformation of the cutting edge |
D. | all of these |
Answer» E. | |
65. |
The operation of machining several surfaces of a workpiece simultaneously is called |
A. | profile milling |
B. | gang milling |
C. | saw milling |
D. | helical milling |
Answer» C. saw milling | |
66. |
Glazing in grinding wheels can be decreased by |
A. | using a harder wheel or by increasing the wheel speed |
B. | using a softer wheel or by decreasing the wheel speed |
C. | using a harder wheel or by decreasing the wheel speed |
D. | using a softer wheel or by increasing the wheel speed |
Answer» C. using a harder wheel or by decreasing the wheel speed | |
67. |
A process of removing metal by pushing or pulling a cutting tool is called |
A. | up milling |
B. | down milling |
C. | forming |
D. | broaching |
Answer» E. | |
68. |
The hardness of a grinding wheel is specified by |
A. | Brinell hardness number |
B. | Rockwel! hardness number |
C. | Vickers pyramid number |
D. | letter of alphabet |
Answer» E. | |
69. |
In which of the following machine, the work remains stationary and the tool is rotated? |
A. | Vertical boring machine |
B. | Horizontal boring machine |
C. | Precision boring machine |
D. | Jig boring machine |
Answer» C. Precision boring machine | |
70. |
The chamfering is an essential operation after |
A. | knurling |
B. | rough turning |
C. | boring |
D. | thread cutting |
Answer» E. | |
71. |
A dense structure of a grinding wheel is used for |
A. | hard materials |
B. | brittle materials |
C. | fnishing cuts |
D. | all of these |
Answer» E. | |
72. |
Side relief angle of a single point tool is the angle |
A. | by which the face of the tool is inclined towards back |
B. | by which the face of the tool is inclined sideways |
C. | between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool |
D. | between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base |
Answer» D. between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base | |
73. |
The binding material used in cemented carbide tools is |
A. | tungsten |
B. | chromium |
C. | silicon |
D. | cobalt |
Answer» E. | |
74. |
In machining metals, chips break due to __________ of work material. |
A. | toughness |
B. | ductility |
C. | elasticity |
D. | work hardening |
Answer» E. | |
75. |
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° | |
76. |
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 | |
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. |
Which of the following statement is correct regarding grinding of high carbon steel? |
A. | Grinding at high speed results in the reduction of chip thickness and cutting forces per grit. |
B. | Aluminium oxide wheels are employed. |
C. | The grinding wheel has to be of open structure. |
D. | all of the above |
Answer» E. | |
79. |
When the end of a tap is tapered for about three or four threads, it is known as a |
A. | taper tap |
B. | bottoming tap |
C. | second tap |
D. | none of these |
Answer» D. none of these | |
80. |
The factor responsible for the formation of continuous chips with built up edge is |
A. | low cutting speed and large rake angle |
B. | low cutting speed and small rake angle |
C. | high cutting speed and large rake angle |
D. | high cutting speed and small rake angle |
Answer» C. high cutting speed and large rake angle | |
81. |
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is |
A. | cutting speed |
B. | feed rate |
C. | shear angle |
D. | tool geometry |
Answer» D. tool geometry | |
82. |
The depth of cut in drilling is __________ the drill diameter. |
A. | equal to |
B. | one-fourth |
C. | one-half |
D. | double |
Answer» D. double | |
83. |
The relation between tool life () and cutting speed () is = Constant. In this relation, the value of n depends upon |
A. | work material |
B. | tool material |
C. | working conditions |
D. | type of chip produced |
Answer» C. working conditions | |
84. |
In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is |
A. | cylindrical grinder |
B. | internal grinder |
C. | surface grinder |
D. | tool and cutter grinder |
Answer» D. tool and cutter grinder | |
85. |
Down milling is also called |
A. | conventional milling |
B. | climb milling |
C. | end milling |
D. | face milling |
Answer» C. end milling | |
86. |
Any number of equal divisions can be obtained on milling machine by |
A. | direct indexing |
B. | simple indexing |
C. | compound indexing |
D. | differential indexing |
Answer» C. compound indexing | |
87. |
In order to grind soft material |
A. | coarse grained grinding wheel is used |
B. | fine grained grinding wheel is used |
C. | medium grained grinding wheel is used |
D. | any one of these |
Answer» B. fine grained grinding wheel is used | |
88. |
A tool used to withdraw a drill from the sleeve is called |
A. | drill remover |
B. | drill puller |
C. | drift |
D. | drill drawer |
Answer» D. drill drawer | |
89. |
The cutting fluid mostly used for machining steel is |
A. | water |
B. | soluble oil |
C. | dry |
D. | heavy oils |
Answer» C. dry | |
90. |
The lip angle is the angle |
A. | between the tool face and the ground end surface of flank |
B. | made by the face of the tool and the plane parallel to the base of the cutting tool |
C. | between the face of the tool and a line tangent to the machined surface at the cutting point |
D. | none of the above |
Answer» B. made by the face of the tool and the plane parallel to the base of the cutting tool | |
91. |
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. | |
92. |
Larger than 15° side cutting edge angle |
A. | increases tool life |
B. | decreases tool life |
C. | produces chipping and decreases tool life |
D. | results in excessive stress concentration and greater heat generation |
Answer» D. results in excessive stress concentration and greater heat generation | |
93. |
Which of the following statement is correct for orthogonal cutting system? |
A. | The cutting edge of the tool is perpendicular to the direction of tool travel. |
B. | The cutting edge clears the width of the workpiece on either ends. |
C. | The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge. |
D. | all of the above |
Answer» E. | |
94. |
The angle made by the face of the tool and the plane parallel to the base of cutting tool is called |
A. | rake angle |
B. | cutting angle |
C. | clearance angle |
D. | lip angle |
Answer» B. cutting angle | |
95. |
Fixtures are used |
A. | for holding and guiding the tool in drilling, reaming or tapping operations |
B. | for holding the work in milling, grinding, planing or turning operations |
C. | to check the accuracy of workpiece |
D. | none of the above |
Answer» C. to check the accuracy of workpiece | |
96. |
A broach has |
A. | roughing teeth |
B. | semi-finishing teeth |
C. | finishing teeth |
D. | all of these |
Answer» E. | |
97. |
The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called |
A. | helix or rake angle |
B. | point angle |
C. | chisel edge angle |
D. | lip clearance angle |
Answer» D. lip clearance angle | |
98. |
The angle on which the strength of the tool depends is |
A. | rake angle |
B. | cutting angle |
C. | clearance angle |
D. | lip angle |
Answer» B. cutting angle | |
99. |
Which of the following operations can be performed with milling cutters? |
A. | cutting key ways on shafts |
B. | cutting external screw threads |
C. | cutting teeth of spur gears |
D. | all of these |
Answer» E. | |
100. |
In oblique cutting system, the maximum chip thickness |
A. | occurs at the middle |
B. | may not occur at the middle |
C. | depends upon the material of the tool |
D. | depends upon the geometry of the tool |
Answer» C. depends upon the material of the tool | |