843 + Mcqs in Materials Science and Manufacturing Engineering Miscellaneous Page 15 McqOptions

701.	For blanking and piercing operations, clearance is provided on the..... and the.... respectively.
A.	Punch & Die
B.	Punch
C.	Die
D.	None of the above
Answer» B. Punch

Discussion

702.	In welding brass with oxyacetylene flame, the type of flame used is _________ .
A.	oxidising
B.	reducing
C.	oxidising and reducing
D.	None of these
Answer» B. reducing

Discussion

703.	In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is 200V and the capacitance of the RC circuit is 50 F. The energy (in J) released per spark across the IEG is ____
A.	15 J
B.	1.01 J
C.	12 J
D.	1 J
Answer» E.

Discussion

704.	The ratio of acetylene to oxygen is approximately for neutral flame used in gas welding
A.	1 : 1
B.	1 : 3
C.	4 : 3
D.	None of these
Answer» B. 1 : 3

Discussion

705.	For gas welding a particular job using a neutral oxyacetylene flame the acetylene consumption was 10 litres. The oxygen consumption from the cylinder in liters will be
A.	5
B.	10
C.	15
D.	20
Answer» C. 15

Discussion

706.	A rectangular hole of size 100 mm 50 mm is to be made on a 5 mm thick sheet of steel having ultimate tensile strength and shear strength of 500 MPa and 300 MPa, respectively. The hole is made by punching process. Neglecting the effect of clearance, the punching force (in kN) is
A.	300
B.	450
C.	600
D.	750
Answer» C. 600

Discussion

707.	Calculate the punch size in mm, for a circular blanking operation for which details are given below. Size of the blank 25 mm Thickness of the sheet 2 mm Radial clearance between punch and die 0.06 mm Die allowance 0.05 mm
A.	24.83
B.	24.89
C.	25.01
D.	25.17
Answer» B. 24.89

Discussion

708.	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
A.	45 kN
B.	70 kN
C.	141 kN
D.	3500 kN
Answer» D. 3500 kN

Discussion

709.	The temperature of a carburizing flame in gas welding that of a neutral or an oxidizing flame
A.	Lower than
B.	Higher than
C.	Equal to
D.	Unrelated to
Answer» B. Higher than

Discussion

710.	For butt welding 40 mm thick steel plates, when the expected quantity of such jobs is 5000 per month over a period of 10 years, choose the best suitable welding process out of the following available alternatives.
A.	SAW
B.	Oxyacetylene gas welding
C.	EBM
D.	MIG
Answer» B. Oxyacetylene gas welding

Discussion

711.	A cutting tool has a nose radius of 1.8 mm the feed rate for a theoretical surface roughness of Rt = 5 microns is
A.	0.268 mm/rev
B.	0.187 mm/rev
C.	0.036 mm/rev
D.	0.0187 mm/rev
Answer» B. 0.187 mm/rev

Discussion

712.	Which of the following powders should be fed for effective oxy-fuel cutting of stainless steel.
A.	Steel
B.	Aluminum
C.	Copper
D.	Ceramic
Answer» B. Aluminum

Discussion

713.	The composition of an oxyacetylene flame for cutting of steel contain more oxygen.
A.	Oxidation process
B.	Reduction process
C.	oxidisation process.
D.	None of the above
Answer» B. Reduction process

Discussion

714.	During gas welding of copper sheets a neutral flame was used consuming 8 litres of acetylene. But the weld was found to be defective. So it was rewelded using an oxidizing flame. The likely consumption of oxygen in litres will be
A.	6
B.	8
C.	10
D.	16
Answer» D. 16

Discussion

715.	The size of BUE in metal cutting increases with
A.	very high speed
B.	large uncut chip thickness
C.	use of cutting fluid
D.	increase in positive rake angle
Answer» C. use of cutting fluid

Discussion

716.	Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 micro-ohms and current f low time of 0.2 second, heat generated during the process will be
A.	0.2 Joule
B.	1 Joule
C.	5 Joule
D.	1000 Joule
Answer» E.

Discussion

717.	In a typical metal cutting operation, using a cutting tool a positive rake = 10 , it is as observed that the shear angle was 20 . The friction angle is
A.	45
B.	30
C.	60
D.	40
Answer» D. 40

Discussion

718.	In comparison to HSS, super HS contains higher percentage of
A.	Tungsten
B.	Carbon
C.	Vanadium
D.	Cobalt
Answer» D. Cobalt

Discussion

719.	Most of the metal cutting heat goes into the
A.	Moving chip
B.	Cutting tool
C.
D.	Work material
E.	Machine tool
Answer» B. Cutting tool

Discussion

720.	Crater wear always starts at some distance from the tool tip because at that point
A.	cutting fluid does not penetrate
B.	chip tool interface temperature is maximum
C.	normal stress on rake face is maximum
D.	tool strength is minimum
Answer» C. normal stress on rake face is maximum

Discussion

721.	In welding a mild steel sheet using an oxyacetylene flame, the total amount of acetylene consumed was 8.0 litres, the oxygen consumption from the cylinder is
A.	8 litres
B.	16 litres
C.	20 litres
D.	24 litres
Answer» B. 16 litres

Discussion

722.	The electrodes used in arc welding are coated. This is not expected to
A.	Provide protective atmosphere to weld
B.	Stabilize the arc
C.	Add alloying elements
D.	Prevent electrode from contamination
Answer» E.

Discussion

723.	In DC welding, the straight polarity (electrode negative) results in
A.	Lower penetration
B.	Lower deposition rate
C.	Less heating of work piece
D.	Smaller weld pool
Answer» C. Less heating of work piece

Discussion

724.	At small variations of arc length at operating conditions, the manual metal arc welding transformer provides nearly
A.	Constant power
B.	Constant power factor
C.	Constant voltage
D.	Constant current
Answer» E.

Discussion

725.	Penetration is increased by
A.	Increasing welding current and welding speed
B.	Increasing welding current and decreasing welding speed
C.	Decreasing welding current and welding speed
D.	Decreasing welding current and increasing welding speed
Answer» C. Decreasing welding current and welding speed

Discussion

726.	A 4 mm thick sheet is rolled with 300 mm diameter rolls to reduce thickness without any change in its width. The friction coefficient at the work-roll interface is 0.1. The minimum possible thickness of the sheet that can be produced in a- single pass is
A.	1.0 mm
B.	1.5 mm
C.	2.5 mm
D.	3.7 mm
Answer» D. 3.7 mm

Discussion

727.	In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The roll strip contact length will be
A.	5 mm
B.	39 mm
C.	78 mm
D.	120 mm
Answer» C. 78 mm

Discussion

728.	Calculate the bite angle when rolling plates 12 mm thick using work rolls 600 mm diameter and reducing the thickness by 3 mm
A.	1.73
B.	4.71
C.	4.73
D.	5.73
Answer» E.

Discussion

729.	A cylindrical riser of 6 cm diameter and 6 cm height has to be designed for a sand casting mould for producing a steel rectangular plate casting of 7 cm 10 cm 2 cm dimensions having the total solidification time of 1.36 minute. The total solidification time (in minute) of the riser is _____.
A.	4.133 min
B.	7.133 min
C.	3 min
D.	None of these
Answer» C. 3 min

Discussion

730.	A cube shaped casting solidifies in 5 min. The solidification time in min for a cube of the same material, which is 8 times heavier than the original casting, will be
A.	10
B.	20
C.	24
D.	40
Answer» C. 24

Discussion

731.	When 1.0% plane carbon steel is slowly cooled from the molten state to 740 C, the resulting structure will contain
A.	Pearlite and cementite
B.	Ferrite and cementite
C.	Austenite and ferrite
D.	Austenite and cementite
Answer» E.

Discussion

732.	The maximum depth to width ratio in EBM welding is
A.	1: 1
B.	2: 1
C.	10: 1
D.	25: 1
Answer» E.

Discussion

733.	A circular hole of 25 mm diameter and depth of 20 mm is machined by EDM process. The material removal rate (in mm /min) is expressed as 4 10
A.	2.1431 min
B.	7.1431 min
C.	78.1431 min
D.	9.1431 min
Answer» C. 78.1431 min

Discussion

734.	If in a turning operation both the feed rate and the nose radius are doubled the surface finish value will be
A.	Decreases by 50%
B.	Increases by 300%
C.	Increases by 100%
D.	Remains unaffected
Answer» B. Increases by 300%

Discussion

735.	The shear angle and shear force, respectively, are
A.	71.565 , 150.12 N
B.	9.218 , 861.64 N
C.	18.435 , 751.04 N
D.	23.157 , 686.66 N
Answer» D. 23.157 , 686.66 N

Discussion

736.	In horizontal milling process (up/down) milling provides better surface finish and (up/down) milling provide longer tool life.
A.	Up milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so lower temperature hence less diffusion.
B.	Down milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so lower temperature hence less diffusion.
C.	Down milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so higher temperature hence less diffusion.
D.	Down milling process provide better surface finish because it start cutting process with finished surface & in down milling longer tool life because of relative velocity between chip & tool so lower temperature hence less diffusion.
Answer» C. Down milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so higher temperature hence less diffusion.

Discussion

737.	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
A.	5
B.	0.5
C.	0.2
D.	0.05
Answer» E.

Discussion

738.	If the longitudinal feed in centreless grinding is expressed by V
A.	Diameter of blank
B.	Diameter of finished workpiece
C.	Diameter of control wheel
D.	Diameter of grinding wheel
Answer» D. Diameter of grinding wheel

Discussion

739.	Pure metal pose machinability problem in turning operations. The reason is the
A.	Increased length of contact due to the production of continuous chip
B.	Susceptibility to Chemical reactions
C.	Tendency to from intense adhesion Joint with the tool face
D.	Absence of inclusions which aids chip formation
Answer» B. Susceptibility to Chemical reactions

Discussion

740.	In twist drills.... (small/large) point angle and ...(small/large) helix angle are provided for drilling soft, low strength steel.
A.	Small point angle large Helix angle Point angle similar to SCEA by increasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle gain for soft & ductile material
B.	Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. lower back rake angle gain for soft & ductile material
C.	Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle loss for soft & ductile material
D.	Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle gain for soft & ductile material
Answer» E.

Discussion

741.	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
A.	10 sec
B.	20 sec
C.	60 sec
D.	100 sec
Answer» C. 60 sec

Discussion

742.	The maximum interference in mm after assembly between a bush of size 30
A.	0.07
B.	0.05
C.	0.02
D.	0.01
Answer» E.

Discussion

743.	To obtain dimension of 61.18 mm using slip gauges, the most appropriate combination is
A.	1.18 + 50.00 + 10.00
B.	0.08 + 1.10 + 60.00
C.	1.08 + 0.10 + 50.00 + 10.00
D.	1.08 + 1.10 + 50.00 + 9.00
Answer» B. 0.08 + 1.10 + 60.00

Discussion

744.	During pure orthogonal turning operation of a hollow cylindrical pipe, it is found that the thickness of the chip produced is 0.5 mm. The feed given to the zero degree rake angle tool is 0.2 mm/rev. The shear strain produced during the operation is__________
A.	V = 1.9
B.	V = 4
C.	V = 2.9
D.	V = 2
Answer» D. V = 2

Discussion

745.	A keyway of 5 mm depth is to be milled in a shaft of diameter 60 0.1 by positioning the shaft in a V-block of angle 120 deg and setting the tool with reference to the intersection of the face of the V-block. The error due to shaft tolerance which would be transferred on to the component is
A.	0.09 mm
B.	0.119 mm
C.	0.22 mm
D.	0.3 mm
Answer» D. 0.3 mm

Discussion

746.	A cylindrical pin of diameter 1.996
A.	0.001
B.	0.015
C.	0.025
D.	0.035
Answer» B. 0.015

Discussion

747.	The diameter of a hole is given as 50.00
A.	10 microns
B.	30 microns
C.	40 microns
D.	28 microns
Answer» C. 40 microns

Discussion

748.	Abbe's principle of alignment is used to be followed in
A.	vernier calipers
B.	depth vernier
C.	internal caliper micrometer
D.	height vernier
Answer» D. height vernier

Discussion

749.	A hole is specified as 30 0.04 mm with 0.01 mm. The virtual diameter of the hole (i.e., the maximum diameter of the pin that can enter the hole) is _______.
A.	9.95 mm
B.	29.95 mm
C.	39.95 mm
D.	49.95 mm
Answer» C. 39.95 mm

Discussion

750.	The tool of an NC machine has to move along a circular arc from (5,5) to (10,10) while performing an operation. The centre of the arc is at (10,5). Which one of the following NC tool path commands performs the above mentioned operation?
A.	NO10 G02 X10 Y10 X5 Y5 R5
B.	NO10 G03 X10 Y10 X5 Y5 R5
C.	NO10 GO1 X5 Y5 X10 Y10 R5
D.	NO10 G02 X5 Y5 X10 Y10 AS
Answer» E.

Discussion

Explore topic-wise MCQs in Materials Science and Manufacturing Engineering.

For blanking and piercing operations, clearance is provided on the..... and the.... respectively.

In welding brass with oxyacetylene flame, the type of flame used is _________ .

In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is 200V and the capacitance of the RC circuit is 50 F. The energy (in J) released per spark across the IEG is ____

The ratio of acetylene to oxygen is approximately for neutral flame used in gas welding

For gas welding a particular job using a neutral oxyacetylene flame the acetylene consumption was 10 litres. The oxygen consumption from the cylinder in liters will be

A rectangular hole of size 100 mm 50 mm is to be made on a 5 mm thick sheet of steel having ultimate tensile strength and shear strength of 500 MPa and 300 MPa, respectively. The hole is made by punching process. Neglecting the effect of clearance, the punching force (in kN) is

Calculate the punch size in mm, for a circular blanking operation for which details are given below. Size of the blank 25 mm Thickness of the sheet 2 mm Radial clearance between punch and die 0.06 mm Die allowance 0.05 mm

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

The temperature of a carburizing flame in gas welding that of a neutral or an oxidizing flame

For butt welding 40 mm thick steel plates, when the expected quantity of such jobs is 5000 per month over a period of 10 years, choose the best suitable welding process out of the following available alternatives.

A cutting tool has a nose radius of 1.8 mm the feed rate for a theoretical surface roughness of Rt = 5 microns is

Which of the following powders should be fed for effective oxy-fuel cutting of stainless steel.

The composition of an oxyacetylene flame for cutting of steel contain more oxygen.

During gas welding of copper sheets a neutral flame was used consuming 8 litres of acetylene. But the weld was found to be defective. So it was rewelded using an oxidizing flame. The likely consumption of oxygen in litres will be

The size of BUE in metal cutting increases with

Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 micro-ohms and current f low time of 0.2 second, heat generated during the process will be

In a typical metal cutting operation, using a cutting tool a positive rake = 10 , it is as observed that the shear angle was 20 . The friction angle is

In comparison to HSS, super HS contains higher percentage of

Most of the metal cutting heat goes into the

Crater wear always starts at some distance from the tool tip because at that point

In welding a mild steel sheet using an oxyacetylene flame, the total amount of acetylene consumed was 8.0 litres, the oxygen consumption from the cylinder is

The electrodes used in arc welding are coated. This is not expected to

In DC welding, the straight polarity (electrode negative) results in

At small variations of arc length at operating conditions, the manual metal arc welding transformer provides nearly

Penetration is increased by

A 4 mm thick sheet is rolled with 300 mm diameter rolls to reduce thickness without any change in its width. The friction coefficient at the work-roll interface is 0.1. The minimum possible thickness of the sheet that can be produced in a- single pass is

In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The roll strip contact length will be

Calculate the bite angle when rolling plates 12 mm thick using work rolls 600 mm diameter and reducing the thickness by 3 mm

A cylindrical riser of 6 cm diameter and 6 cm height has to be designed for a sand casting mould for producing a steel rectangular plate casting of 7 cm 10 cm 2 cm dimensions having the total solidification time of 1.36 minute. The total solidification time (in minute) of the riser is _____.

A cube shaped casting solidifies in 5 min. The solidification time in min for a cube of the same material, which is 8 times heavier than the original casting, will be

When 1.0% plane carbon steel is slowly cooled from the molten state to 740 C, the resulting structure will contain

The maximum depth to width ratio in EBM welding is

A circular hole of 25 mm diameter and depth of 20 mm is machined by EDM process. The material removal rate (in mm /min) is expressed as 4 10

If in a turning operation both the feed rate and the nose radius are doubled the surface finish value will be

The shear angle and shear force, respectively, are

In horizontal milling process (up/down) milling provides better surface finish and (up/down) milling provide longer tool life.

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

If the longitudinal feed in centreless grinding is expressed by V

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

In twist drills.... (small/large) point angle and ...(small/large) helix angle are provided for drilling soft, low strength steel.

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

The maximum interference in mm after assembly between a bush of size 30

To obtain dimension of 61.18 mm using slip gauges, the most appropriate combination is

During pure orthogonal turning operation of a hollow cylindrical pipe, it is found that the thickness of the chip produced is 0.5 mm. The feed given to the zero degree rake angle tool is 0.2 mm/rev. The shear strain produced during the operation is__________

A keyway of 5 mm depth is to be milled in a shaft of diameter 60 0.1 by positioning the shaft in a V-block of angle 120 deg and setting the tool with reference to the intersection of the face of the V-block. The error due to shaft tolerance which would be transferred on to the component is

A cylindrical pin of diameter 1.996

The diameter of a hole is given as 50.00

Abbe's principle of alignment is used to be followed in

A hole is specified as 30 0.04 mm with 0.01 mm. The virtual diameter of the hole (i.e., the maximum diameter of the pin that can enter the hole) is _______.

The tool of an NC machine has to move along a circular arc from (5,5) to (10,10) while performing an operation. The centre of the arc is at (10,5). Which one of the following NC tool path commands performs the above mentioned operation?