Q1:

In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the depth of cut is 2 mm. The chip thickness obtained is 0.48 mm. If the orthogonal rake angle is zero and the principal cutting edge angle is 90°, the shear angle is degree is

Q2:

In orthogonal turning of low carbon steel pipe with principal cutting edge angle of 90°, the main cutting force is 1000 N and the feed force is 800 N. The shear angle is 25° and orthogonal rake angle is zero. Employing Merchant’s theory, the ratio of friction force to normal force acting on the cutting tool is

Q3:

A steel bar 200 mm in diameter is turned at a feed of 0.25 mm/rev with a depth of cut of 4 mm. The rotational speed of the work piece is 160 rpm. The material removal rate in mm³/s is

Q4:

A medium carbon steel workpiece is turned on a lathe at 50 m/min, cutting speed 0.8 mm/rev feed and 1.5 mm depth of cut. What is the rate of metal removal?

Q5:

In an orthogonal machining operation, the tool life obtained is 10 min at a cutting speed of 100 m/min, while at 75 m/min cutting speed, the tool life is 30 min. The value of index (n) in the Taylor’s tool life equation

Q6:

In a single‐point turning operation of steel with a  carbide tool, Taylor's tool life exponent is 0.25. If the cutting speed is halved, the tool life will increase by

Q7:

Which of the following materials can be used for making patterns?         

1. Aluminium 2. Wax 3. Mercury 4. Lead

Select the correct answer using the codes given below:

Q8:

The pattern adopted for those castings where there are some portions which are structurally weak and are likely to break by the force of ramming are called:

Q9:

In sand casting, fluidity of the molten metal increases with

Q10:

Fluidity in casting  operation is greatly influenced by

Q11:

Misrun is a casting defect which occurs due to

Q12:

In light metal casting, runner should be so designed that:

1. It avoids aspiration

2. It avoids turbulence

3. The path of runner is reduced in area so that unequal volume of flow through each gate takes place

Q13:

The advantage of the welding process is

Q14:

Consider the following statements.

Cast iron is difficult to weld, because of

1. Low ductility

2. Poor fusion

3. Tendency to crack on cooling

Which of these statements are correct ?

Q15:

Which of the following is an interference fit?

Q16:

By which of the following process the metering holes in injector nozzles of diesel engines can be suitably made ?

Q17:

In electrochemical grinding

Q18:

In Oxyacetylene gas welding, temperature at the inner cone of the flame is around.

Q19:

Which of the following process does not cause tool wear ?

Q20:

The correct sequence of the given materials in ascending order of their weldability is

Q21:

Consider the following benefits of CIM:

1. Less direct labour.

2. Less scrap and rework

3. Higher machine use.

Q22:

Arrange the processes in the increasing order of their maximum material removal rate.

Electrochemical Machining (ECM)

Ultrasonic Machining (USM)

Electron Beam Machining (EBM)

Laser Beam Machining (LBM) and

Electric Discharge Machining (EDM)

Q23:

Consider the following statements in relation to the non conventional machining processes:

1. Different forms of energy directly applied to the piece to have shape transformation or material removal from work surface.

2. Relative motion between the work and the tool is essential.

3. Cutting tool is not in physical contact with work piece.

Q24:

Which one of the following statements is correct in respect of unconventional machining processes?

Q25:

ECM cannot be undertaken for

Q26:

In ECM, the material removal is due to

Q27:

What are the main components of an NC machine

1 Part program

2 Machine control unit

3 Servo motor

Q28:

Trajectory of a robot means

Q29:

A metal disc of 20 mm diameter is to be punched from a sheet of 2 mm thickness. The punch and the die clearance is 3%. The required punch diameter is

Q30:

A punch for which the maximum crushing stress is 4 times the maximum shearing stress of the plate, the biggest hole that can be punched in the plate would be of diameter equal to

Q31:

Spring back in metal forming depends on

Q32:

The shear strength of a sheet metal is 300 MPa. The blanking force required to produce a blank of 100 mm diameter from a 1.5 mm thick sheet is close to

Q33:

Using direct extrusion process, a round billet of 100 mm length and 50 mm diameter is extruded. Considering an ideal deformation process (no friction and no redundant work), extrusion ratio 4, and average flow stress of material 300 MPa, the pressure (in MPa) on the ram will be

Q34:

For perfectly‐plastic work material, negligible interface friction and no redundant work, the theoretically maximum possible reduction in the wire drawing operation is

Q35:

Spinning operation is carried out on

Q36:

In turning a solid round bar, if the travel of the cutting tool in the direction of feed motion is 1000 mm, rotational speed of the workpiece is 500 rpm, and rate of feed is 0.2 mm/revolution, then the machining time will be

Q37:

For taper turning on Centre lathes, the method of swiveling the compound rest is preferred for:

Q38:

A lead-screw with half nuts in a lathe, free to rotate in both directions has

Q39:

To get good surface finish on a turned job, one should use a sharp tool with a ….. feed and…… speed of rotation of the job.

Q40:

What is the number of jaws in self-centred chuck?