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4

A drill mainly used in drilling brass, copper or softer materials, is

A. Flat drill

B. Straight fluted drill

C. Parallel shank twist drill

D. Tapered shank twist drill

Correct Answer :

B. Straight fluted drill


Related Questions

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4

In lapping operation, the amount of metal removed is

A. 0.005 to 0.01 mm

B. 0.01 to 0.1 mm

C. 0.05 to 0.1 mm

D. 0.5 to 1 mm

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4

A grinding wheel becomes glazed (i.e. cutting edge takes a glasslike appearance) due to

A. Wear of bond

B. Breaking of abrasive grains

C. Wear of abrasive grains

D. Cracks on grinding wheel

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4

The chuck used for setting up of heavy and irregular shaped work should be

A. Four jaw independent chuck

B. Three jaw universal chuck

C. Magnetic chuck

D. Drill chuck

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4

The helix angle of a drill is __________ for drilling brass.

A. Equal to 30°

B. Less than 30°

C. More than 30°

D. None of these

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4

A better machinable metal is one which gives

A. Lower chip-tool contact area and larger shear angle

B. Higher chip-tool contact area and smaller shear angle

C. Lower chip-tool contact area and smaller shear angle

D. Higher chip-tool contact area and larger shear angle

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4

A twist drill is specified by its

A. Shank, material and diameter

B. Shank, lip angle and size of flute

C. Material, length of body and helix angle

D. Any one of these

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4

A 15 mm drilling machine means that it can drill a hole

A. Of maximum diameter 15 mm

B. In 15 mm thick plates

C. Having cross-sectional area of 15 mm²

D. None of these

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4

The tap used to cut threads in a blind hole is

A. Taper tap

B. Second tap

C. Bottoming tap

D. Any one of these

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4

The common welding error that occurs due to wrong speed, faulty preparation, and high / low current, improper electrode size is called?

A. Distortion

B. Warping

C. Porous weld

D. Poor fusion

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4

In electro discharge machining, tool is made of

A. Brass

B. Copper

C. Copper tungsten alloy

D. All of these

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4

The floating position of the holding fixture in a rotary transfer device is used to

A. Improve the accuracy of location

B. Reduce the tendency to over-index

C. Improve upon the acceleration and deceleration characteristics

D. Reduce the cycle time

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4

A __________ grinding wheel is used to grind soft materials.

A. Course grained

B. Medium grained

C. Fine grained

D. None of these

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4

The stroke of a shaping machine is 250 mm. It makes 30 double strokes per minute. The overall average speed of operation is

A. 3.75 m/min

B. 5 m/min

C. 7.5 m/min

D. 15 m/min

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4

Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as

A. Cold shut

B. Swell

C. Sand wash

D. Scab

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4

The specific cutting energy used for establishing the machinability of the metal depends upon its

A. Coefficient of friction

B. Microstructure

C. Work hardening characteristics

D. All of these

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4

The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is

A. Feed rate, depth of cut, cutting speed

B. Depth of cut, cutting speed, feed rate

C. Cutting speed, feed rate, depth of cut

D. Feed rate, cutting speed, depth of cut

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4

A grinding wheel is said to be of _________ if the abrasive grains can be easily dislodged.

A. Soft grade

B. Medium grade

C. Hard grade

D. None of these

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4

The size of a lathe is specified by the

A. Length between centres

B. Swing diameter over the bed

C. Swing diameter over the carriage

D. All of these

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4

The soft grade grinding wheels are denoted by the letters

A. A to H

B. I to P

C. Q to Z

D. A to P

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4

The lathe centres are provided with standard taper known as

A. Morse taper

B. Seller's taper

C. Chapman taper

D. Brown and Sharpe taper

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4

Which of the following statement is correct in regard to centreless grinding?

A. The workpiece is supported throughout its entire length as grinding takes place.

B. It is a continuous process and adopted for production work.

C. It requires no holding device for the work.

D. All of the above

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4

The cutting speed is maximum while machining __________ with a high speed steel tool.

A. Cast iron

B. Mild steel

C. Brass

D. Aluminium

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4

The cutting fluid mostly used for machining steel is

A. Water

B. Soluble oil

C. Dry

D. Heavy oils

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4

Hardness of steel greatly improves with

A. Annealing

B. Cyaniding

C. Normalizing

D. Tempering

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4

Crater wear occurs mainly on the

A. Nose part, front relief face and side relief face of the cutting tool

B. Face of the cutting tool at a short distance from the cutting edge only

C. Cutting edge only

D. Front face only

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4

The work or surface speed for cylindrical grinding varies from

A. 5 to 10 m/min

B. 10 to 20 m/min

C. 20 to 30 m/min

D. 40 to 60 m/min

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4

The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.

A. Equal to

B. Less than

C. More than

D. None of these

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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 cutting speed of a drill depends upon the

A. Material of drill

B. Type of material to be drilled

C. Quality of surface finish desired

D. All of these

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4

A taper tap has

A. Its end tapered for about three or four threads

B. Its end tapered for about eight or ten threads

C. Full threads for the whole of its length

D. None of the above