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4

The purpose of jigs and fixtures is to

A. Increase machining accuracy

B. Facilitate interchangeability

C. Decrease expenditure on quality control

D. All of these

Correct Answer :

D. All of these


Related Questions

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4

In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.

A. Globular transfer

B. Spray transfer

C. GMAW practice

D. Dip transfer

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4

The chuck preferred for quick setting and accurate centering of a job is

A. Four jaw independent chuck

B. Collect chuck

C. Three jaw universal chuck

D. Magnetic chuck

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4

The relation between the tool life (T) in minutes and cutting speed (V) in m/min is (where n = An exponent, which depends upon the tool and workpiece, and C = A constant)

A. VnT = C

B. VTn = C

C. Vn/T = C

D. V/Tn = C

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4

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

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4

In machining metal, cutting force at the cutting edge is measured by a

A. Wattmeter

B. Dynamometer

C. Hydrometer

D. Pyrometer

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4

Which of the following is the correct data structure for solid models?

A. Solid part - faces - edges - vertices

B. Solid part - edges - faces - vertices

C. Vertices - edges - faces - solid parts

D. Vertices - faces- edges - solid parts

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4

A grinding wheel is said to be of _________ if it holds the abrasive grains more securely.

A. Soft grade

B. Medium grade

C. Hard grade

D. None of these

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4

The average cutting speed for turning mild steel with a high speed steel tool is

A. 15 to 19 m/min

B. 25 to 31 m/min

C. 60 to 90 m/min

D. 90 to 120 m/min

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4

The shear velocity is the velocity of

A. Tool relative to the workpiece

B. Chip relative to the tool

C. Tool along the tool face

D. None of these

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4

A diamond locating pin is used in jigs and fixtures because

A. Diamond is very hard and wear resistant

B. It occupies very little space

C. It helps in assembly with tolerance on centre distance

D. It has a long life

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4

The high cutting speed and large rake angle of the tool will result in the formation of

A. Continuous chips

B. Discontinuous chip

C. Continuous chips with built up edge

D. None of these

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4

NC contouring is an example of

A. Continuous path positioning

B. Point-to-point positioning

C. Absolute positioning

D. Incremental positioning

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4

Discontinuous chips are formed during machining of

A. Brittle metals

B. Ductile metals

C. Hard metals

D. Soft metals

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4

The operation in which oil is permeated into the pores of a powder metallurgy product is known as

A. Mixing

B. Sintering

C. Impregnation

D. Infiltration

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4

In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called

A. Friction zone

B. Work-tool contact zone

C. Shear zone

D. None of these

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4

The tool material, for faster machining, should have

A. Wear resistance

B. Red hardness

C. Toughness

D. All of these

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4

An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as

A. Counter-boring

B. Grooving

C. Knurling

D. Facing

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4

Match the items of List-I (Equipment) with the items of List-II (Process) and select the correct answer using the given codes.
List-I (Equipment)List-II (Process)
P. Hot Chamber Machine1. Cleaning
Q. Muller2. Core making
R. Dielectric Baker3. Die casting
S. Sand Blaster4. Annealing
.5. Sand mixing

A. P-2, Q-1, R-4, S-5

B. P-4, Q-2, R-3, S-5

C. P-4, Q-5, R-1, S-2

D. P-3, Q-5, R-2, S-1

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4

Crater wear is mainly due to the phenomenon known as

A. Adhesion of metals

B. Oxidation of metals

C. Diffusion of metals

D. All of these

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4

The method of grinding used to produce internal cylindrical holes and tapers, is

A. Internal cylindrical grinding

B. Form grinding

C. External cylindrical grinding

D. Surface grinding

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4

The cutting speed is minimum while machining _________ with a high speed steel tool.

A. Cast iron

B. Mild steel

C. Brass

D. Aluminium

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4

A dynamometer is a device used for the measurement of

A. Chip thickness ratio

B. Forces during metal cutting

C. Wear of the cutting tool

D. Deflection of the cutting tool

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4

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

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4

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

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4

In a milling operation, two side milling cutters are mounted with a desired distance between them so that both sides of a workpiece can be milled simultaneously. This set up is called

A. Gang milling

B. Straddle milling

C. String milling

D. Side milling

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4

During the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 ; the type of tool motion will be

A. Circular Interpolation − clockwise

B. Circular Interpolation − counter clockwise

C. Linear Interpolation

D. Rapid feed

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4

What is the method of brazing used to join relatively small assemblies made from materials that either do not oxidize at the brazing temperature or can be protected from oxidation with a flux?

A. Torch brazing

B. Dip brazing

C. Resistance brazing

D. Furnace brazing

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4

The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.

A. Equal to

B. Smaller than

C. Greater than

D. None of these

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4

The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face centred cubic space lattices, respectively, are

A. 1, 2, 2

B. 1, 2, 4

C. 2, 3, 4

D. 2, 4, 4

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4

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