MCQOPTIONS
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MCQOPTIONS
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 | |