Past Year Questions: Machining Process - Mechanical Engineering MCQ

Cutting speed in grinding is set to a high value to

[ME 1988]

Pure metal pose machinability problem in turning operations. The reason is the

[ME 1988]

If the longitudinal feed in centreless grinding is expressed by V_f = πDN sinα, D stands for

[ME 1990]

For cutting double start screw threads of pitch 1.0 mm on a lathe, the thread cutting tool should have a feed rate of

[ME 1991]

A milling cutter having 10 teeth is rotating at 100 rpm. The table feed is set at 50-mm per minute. The feed per tooth in mm is

[ME 1991]

A milling cutter having 8 teeth is rotating at 150 rpm. If the feed per tooth is 0.1 mm, the speed in mm per minute is

[ME 1993]

A grinding wheel A 27 K 7 V is specified for finish grinding of a HSS cutting tool. What do you understand about the wheel from the above code.
Is this an appropriate choice?

[ME 1994]

Cutting power consumption in turning can be significantly reduced by

[ME 1995]

Among the conventional machining processes, maximum specific energy is consumed in

[ME 1995]

Plain milling of mild steel plates produces

[ME 1995]

Abrasive material used in grinding wheel selected for grinding ferrous alloys is

[ME 2000]

A conventional lathe and a CNC lathe are under consideration for machining a given part. The relevant data are shown below:

The machine preferred for producing 100 pieces is

[ME 2000]

The hardness of a grinding wheel is determined by the

[ME 2002]

The time taken to drill a hole through a 25 mm thick plate with the drill rotating at 300 rpm and moving at a feed rate of 0.25 mm/rev is

[ME 2002]

Cutting tool is much harder than the workpiece.Yet the tool wears out during the tool-work interaction, because

[ME 2014,Set-3]

Better surface finish is obtained with a large rake angle because

[ME 2014,Set-4]

The length, width and thickness of a steel sample are 400 mm, 410 mm, 40 mm and 20 mm, respectively. Its thickness needs to be uniformly reduced by 2 mm in a single pass by using horizontal slab miling. The miling cutter (diameter : 100 mm, width ; 50 mm) has 20 teeth and rotates at 1200 rpm. The feed per tooth is 0.05 mm. The feed direction is along the length of the sample. If the over-travel distance is the same as the approach distance, the approach distance and time taken to complete the required machining task are :

[ME 2019,Set-1]

Assertion (A): Single start threads are used for fastening purposes.
Reason (R): Single start threads are easier to produce in a lathe.

[PI 1990]

A drilling machine has to be designed with 8 spindle speeds ranging approximately between 120 to 1200 rpm. The 5th spindle speed is

[PI 1991]

In a grinding wheel marked with AA-48-L-7-V25, L refers to

[PI 1992]

Find the speed range ratio for the drilling machine spindle if the minimum and maximum diameters of drills used are 5 mm and 25 mm respectively and if the machinability indices for the work materials are 120 (brass) and 40 (alloy steel)

[PI 1992]

If the index crank of a dividing head is turned through one complete revolution and 10 holes in a 30 hole Circle plate, the workpiece turns through (in degrees)

[PI 1992]

A grinding wheel is said to be glazed if

[PI 1995]

A side and face cutter 125 mm diameter has 10 teeth. If operates at a cutting speed of 14 m/ min with a table traverse 100 mm/min the feed per tooth of the cutter is

[PI 2002]

During turning of a low carbon steel bar with TiN coated carbide insert, one needs to improve surface finish without sacrificing material removal rate. The achieve improved surface finish one should

[PI 2010]

The binding material used in cemented carbide cutting tools is

[PI 2011]

Grinding ratio is defined as Volume of wheel wear