Explore topic-wise MCQs in Mechanical Engineering.

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