MES Unit 4

What is the primary purpose of machining?

• To join two metal pieces together

• To remove excess material from a workpiece in the form of chips

• To heat-treat the workpiece for hardness

• To cast metal into a desired shape

Which of the following processes typically precedes machining in manufacturing?

• Welding

• Casting or metalworking

• Polishing

• Electroplating

Why is machining often necessary in assembling parts?
A)
B)
C) D)

• To eliminate the need for fasteners

• To reduce the cost of production

• To ensure mating surfaces have complementary form, dimensions, and finish

• To increase the weight of the final product

What is the primary type of surface produced by a lathe?

• Flat surface

• Spherical surface

• Cylindrical surface

• Irregular surface

How is the material removal process achieved in a lathe?

• By rotating the cutting tool while the workpiece remains stationary

• By rotating the workpiece while the single-point cutting tool moves parallel to the axis of rotation

• By hammering the workpiece into shape

• By melting and reshaping the workpiece

Why is a centre lathe also called an "engine lathe"?

• Because it uses electric engines for operation

• Because early lathes were driven by steam engines

• Because it was invented by mechanical engineers

• Because it has multiple engine-like components

What is the function of the cross slide in a lathe?

• To disengage the lead screw during threading

• To rotate the workpiece at high speeds

• To move the tool at a right angle to the spindle axis

• To move the tool parallel to the spindle axis

Why is the lead screw important in a lathe?

• It provides power feed for plain turning operations

• It is used exclusively for rough turning at high speeds

• It ensures accurate thread cutting when engaged with the split nut

• It swivels the compound rest to adjust tool angles

What is the difference between rough turning and finish turning?

• Rough turning uses higher speeds for material removal, while finish turning uses lower speeds for precision

• Rough turning is done with the lead screw engaged, while finish turning requires disengagement

• Rough turning generates flat surfaces, while finish turning produces cylindrical surfaces

• Rough turning involves the compound rest, while finish turning uses only the cross slide

What determines the pitch of a screw thread when cutting it on a lathe?

• The rotational speed of the spindle alone

• The ratio of the rotational speeds of the lead screw and the spindle

• The diameter of the workpiece

• The type of cutting tool used