843 + Mcqs in Materials Science and Manufacturing Engineering Miscellaneous Page 14 McqOptions

651.	What is the velocity of the steel at the bottom of the sprue if the sprue height is 30 cm? Assume the frictional and other losses to be 20%.
A.	4.17 m/s
B.	1.17 m/s
C.	2.17 m/s
D.	3.17 m/s
Answer» D. 3.17 m/s

Discussion

652.	In a casting process, a vertical channel through which molten metal flows downward from pouring basin to runner for reaching the mould cavity is called
A.	riser
B.	blister
C.	pin hole
D.	sprue
E.	None of these
Answer» F.

Discussion

653.	Equal amounts of a liquid metal at the same temperature are poured into three moulds made of steel, copper and aluminum. The shape of the cavity is a cylinder with 15 mm diameter. The size of the moulds are such that the outside temperature of the moulds do not increase appreciably beyond the atmospheric temperature during solidification. The sequence of solidification in the mould from the fastest to slowest is (Thermal conductivities of steel, copper and aluminum are 60.5, 401 and 237 W/mK, respectively. Specific heats of steel, copper and aluminum are 434, 385 and 903 J/ kgK, respectively. Densities of steel, copper and aluminum are 7854, 8933 and 2700 kg/m , respectively.)
A.	Copper - Steel - Aluminium
B.	Aluminum - Steel - Copper
C.	Copper - Aluminium - Steel
D.	Steel-Copper-Aluminum
Answer» D. Steel-Copper-Aluminum

Discussion

654.	A shaft of diameter 20
A.	Transition fit
B.	Interference fit
C.	Clearance fit
D.	None of these
Answer» D. None of these

Discussion

655.	In an interchangeable assembly, shafts of size 25.000
A.	10 microns
B.	20 microns
C.	30 microns
D.	60 microns
Answer» E.

Discussion

656.	What are the upper and lower limits of the shaft represented by 60 f
A.	lower lim. = 59.924 mm, Upper lim. = 59.970 mm
B.	lower lim. = 59.954 mm, Upper lim. = 60.000 mm
C.	lower lim. = 59.970 mm, Upper lim. = 60.016 mm
D.	lower limit = 60.000 mm, Upper limit = 60.046 mm
Answer» B. lower lim. = 59.954 mm, Upper lim. = 60.000 mm

Discussion

657.	A hole is specified as 40
A.	0.04
B.	0.05
C.	0.10
D.	0.11
Answer» D. 0.11

Discussion

658.	The transformation matrix for mirroring a point in x-y plane about the line y = x is given by
A.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>0</td><td></td><td></td><td>-1</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>-1</td><td></td><td></td><td>0</td></tr></table>
B.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>1</td><td></td><td></td><td>0</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>0</td><td></td><td></td><td>-1</td></tr></table>
C.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>-1</td><td></td><td></td><td>0</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>0</td><td></td><td></td><td>1</td></tr></table>
D.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-obracket-h1.gif"></td><td>0</td><td></td><td></td><td>1</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cbracket-h1.gif"></td></tr><tr><td>1</td><td></td><td></td><td>0</td></tr></table>
Answer» E.

Discussion

659.	A point P(1, 3, -5) is translated by 2 + 3 k + 4&jcirc; and then rotated counter clockwise by 90 about the z-axis. The new position of the point is:
A.	( 6, 3, 9)
B.	( 6, 3, 9)
C.	(6, 3, 9)
D.	(6, 3, 9)
Answer» B. ( 6, 3, 9)

Discussion

660.	Increase in carbon content in plain carbon steel raise its
A.	Ductility and UTS
B.	Tensile strength and malleability
C.	Tensile strength and hardness
D.	Ductility and melting temperature
Answer» D. Ductility and melting temperature

Discussion

661.	Increase in rake angle causes... (A)... in chip thickness and ...(B)... in shear angle
A.	increase/reduction
B.	increase/decrease
C.	reduction /decrease
D.	None of these
Answer» B. increase/decrease

Discussion

662.	The base of a brass bracket has to be rough ground to remove the unevenness. The 4 wheels available in the store. The appropriate wheel is
A.	A 30 K 12 V
B.	C 90 M 4 B
C.	C 30 Q 12 V
D.	C 50 G 8 V
Answer» B. C 90 M 4 B

Discussion

663.	In HSS tool materials the element tungsten can be completely replaced, without changing the material property by
A.	Molybdenum
B.	Carbon
C.	Cobalt
D.	Vanadium
Answer» B. Carbon

Discussion

664.	Hot hardness in an essential property for
A.	Gear materials
B.	Shaft materials
C.	Welding electronics
D.	Tool materials
Answer» E.

Discussion

665.	In metal cutting BUE formation results in
A.	improvement in surface finish
B.	reduction in cutting force
C.	deterioration of surface finish
D.	improvement in tool life
Answer» D. improvement in tool life

Discussion

666.	Only negative rake angles are used with the following tool material
A.	HSS
B.	Carbon tool steels
C.	Carbides
D.	Diamonds
Answer» D. Diamonds

Discussion

667.	The material most commonly used for manufacturing of machine tool beds is.
A.	MS
B.	Grey CI
C.	White CI
D.	Galvanized iron
Answer» C. White CI

Discussion

668.	When the depth of cut in increased, the specific cutting energy
A.	Increases
B.	Decreases
C.	remains same
D.	Reaches an optimum value
Answer» C. remains same

Discussion

669.	A built up edge is formed while machining
A.	ductile material at high speed
B.	ductile materials at low speed
C.	brittle materials at high speed
D.	brittle materials at low speed
Answer» C. brittle materials at high speed

Discussion

670.	What is the approximate% change in the life, f, of the tool with zero rake angle used in orthogonal cutting when its clearance angle, , is changed from 10 to 7 deg?
A.	30% increase
B.	30% decrease
C.	70% increase
D.	70% decrease
Answer» C. 70% increase

Discussion

671.	The contraction allowance provided on the pattern and core boxes compensates for the following type of contraction
A.	liquid contraction
B.	solidification contraction
C.	solid contraction
D.	All of the above three types of contractions
Answer» D. All of the above three types of contractions

Discussion

672.	Riser is designed so as to
A.	freeze after the casting freezes
B.	freeze before the casting freezes
C.	freeze at the same time as the casting
D.	minimize the time of pouring
Answer» B. freeze before the casting freezes

Discussion

673.	Light impurities in the molten metal are prevented from reaching the mould cavity by providing
A.	Strainer
B.	Bottom well
C.	Skim bob
D.	All of the above
Answer» D. All of the above

Discussion

674.	Converging passage is used for feeding the liquid molten metal into the mould to
A.	increase the rate of feeding
B.	quickly break off the protruding portion of the casting
C.	decrease wastage of cast metal
D.	avoid aspiration of air
Answer» E.

Discussion

675.	When there is no room temperature change,
A.	the total shrinkage allowance on a pattern is independent of
B.	pouring temperature of the liquid metal
C.	freezing temperature of the liquid metal
D.	the component size
E.	coefficient of thermal contraction of solidified metal
Answer» B. pouring temperature of the liquid metal

Discussion

676.	The pressure at the in-gate will be maximum with the gating system
A.	4 : 8 : 3
B.	1 : 3 : 3
C.	1 : 2 : 4
D.	1 : 2 : 1
Answer» E.

Discussion

677.	Chills are used in moulds to
A.	achieve directional solidification
B.	reduce possibility of below holes
C.	reduce the freezing time
D.	smoothen the metal for reducing spatter
Answer» B. reduce possibility of below holes

Discussion

678.	A mould has downsprue whose length is 20 cm and the cross sectional area at the base of the downsprue is 1 cm
A.	4.05 s
B.	5.05 s
C.	6.05 s
D.	7.25 s
Answer» C. 6.05 s

Discussion

679.	Gray cast iron blocks 200 x 100 x 10 mm are to be cast in sand moulds, Shrinkage allowance for pattern making is 1%. The ratio of the volume of pattern to that of the casting will be
A.	0.97
B.	0.99
C.	1.61
D.	1.03
Answer» B. 0.99

Discussion

680.	With a solidification factor of 0.97 106 s/m
A.	539
B.	1078
C.	4311
D.	3233
Answer» C. 4311

Discussion

681.	A shear of 20 mm {S = 20 mm) is now provided on the blade. Assuming force vs displacement curve to be trapezoidal, the maximum force (in kN) exerted is
A.	5
B.	10
C.	20
D.	40
Answer» E.

Discussion

682.	From the lists given below, choose the most appropriate set of heat treatment process and the corresponding process characteristies
A.	P-3, Q-1, R-5
B.	P-4, Q-3, R-2
C.	P-4, Q-1, R-2
D.	P-1, Q-5, R-4
Answer» D. P-1, Q-5, R-4

Discussion

683.	A cubic casting of 50 mm side undergoes volumetric solidification shrinkage and volumetric solid contraction of 4% and 6% respectively. No riser is used. Assume uniform cooling in all directions. The side of the cube after solidification and contraction is
A.	48.32 mm
B.	49.90 mm
C.	49.94 mm
D.	49.96 mm
Answer» B. 49.90 mm

Discussion

684.	In a gating system, the ratio 1 : 2 : 4 represents
A.	sprue base area : runner area : ingate area
B.	pouring basin area : ingate area : runner area
C.	sprue base area : ingate area : casting area
D.	runner area : ingate area : casting area
Answer» C. sprue base area : ingate area : casting area

Discussion

685.	Match the items in Column I and Column II.
A.	P 1, Q 3, R 2, S 4
B.	P 1, Q 4, R 2, S 3
C.	P 3, Q 4, R 2, S 1
D.	P 4, Q 1, R 2, S 3
Answer» E.

Discussion

686.	A strip with cross-sectional area 150 mm 4.5 mm is being rolled with 20% reduction of area using 450 mm diameter rollers. The angle subtended by the deformation zone at the roll centre is (in radians)
A.	0.01
B.	0.02
C.	0.03
D.	0.06
Answer» E.

Discussion

687.	A wire of 0.1 mm dia is drawn from a rod of 15 mm diameter dies giving reductions of 20%, 40% and 80% are available. For minimum error in the final size, the number of stages and reduction at each stage respectively would be
A.	3 stages and 80% reduction for all three stages
B.	4 stages and 80% reduction for first three stages followed by a finishing stage of 20% reduction
C.	5 stage and reduction of 80%, 80%, 40%, 40%, 20% is sequence
D.	None of these
Answer» C. 5 stage and reduction of 80%, 80%, 40%, 40%, 20% is sequence

Discussion

688.	In a slab rolling operation, the maximum thickness reduction ( h
A.	5.7106
B.	32.7106
C.	51.7106
D.	0.7106
Answer» B. 32.7106

Discussion

689.	With respect to metal working, match Group A with Group B:
A.	P-II, Q-III, R-VI, S-V
B.	P-III, Q-I, R-VI, S-V
C.	P-III, Q-I, R-IV, S-VI
D.	P-I, Q-II, R-V, S-VI
Answer» C. P-III, Q-I, R-IV, S-VI

Discussion

690.	A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. The diameter of the die should be (Take clearance as 3% of sheet thickness) _______.
A.	49.925 mm
B.	50.00 mm
C.	50.075 mm
D.	None of these
Answer» C. 50.075 mm

Discussion

691.	In orthogonal machining operation, the chip thickness and the uncut chip thickness are equal to 0.45 mm. If the tool rake and is 0 deg. The shear plane angle is
A.	45
B.	30
C.	18
D.	60
Answer» B. 30

Discussion

692.	The thickness of the blank needed to produce, by power spinning a missile cone of thickness 1.5 mm and half cone angle 30
A.	3.0 mm
B.	2.5 mm
C.	2.0 mm
D.	1.5 mm
Answer» B. 2.5 mm

Discussion

693.	10 mm diameter holes are to be punched in a steel sheet of 3 mm thickness. Shear strength of the material is 400 N/mm
A.	22.6 kN
B.	37.7 kN
C.	61.6 kN
D.	94.3 kN
Answer» B. 37.7 kN

Discussion

694.	A metal disc of 20 mm diameter is to be punched from a sheet of 2 mm thickness. The punch and the dia clearance is 3%. The required punch diameter is
A.	19.88 mm
B.	19.94 mm
C.	20.06 mm
D.	20.12 mm
Answer» B. 19.94 mm

Discussion

695.	In blanking operation the clearance is provided on
A.	The die
B.	The punch
C.	Both die and punch equally
D.	Neither the punch nor the die
Answer» C. Both die and punch equally

Discussion

696.	Volume of a cube of side l and volume of a sphere of radius r are equal. Both the cube and the sphere are solid and of same material. They are being east. The ratio of the solidification time of the cube to the same of sphere is
A.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2 </center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td><sup>3</sup></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>r</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td><sup>6</sup></td></tr><tr><td style="text-align: center;">6</td><td></td><td style="text-align: center;">l</td></tr></table>
B.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4 </center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>r</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td><sup>2</sup></td></tr><tr><td style="text-align: center;">6</td><td style="text-align: center;">l</td></tr></table>
C.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4 </center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td><sup>2</sup></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>r</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td><sup>3</sup></td></tr><tr><td style="text-align: center;">6</td><td></td><td style="text-align: center;">l</td></tr></table>
D.	<table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4 </center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td><sup>2</sup></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>r</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td><sup>4</sup></td></tr><tr><td style="text-align: center;">6</td><td></td><td style="text-align: center;">l</td></tr></table>
Answer» E.

Discussion

697.	The thickness of a sheet is reduced by rolling (without any change in width) using 600 mm diameter rolls. Neglect elastic deflection of the rolls and assume that the coefficient of friction at the roll-workpiece interface is 0.05. The sheet enters the rotating rolls unaided. If the initial sheet thickness is 2 mm, the minimum possible final thickness that can be produced by this process in a single pass is ____ mm (round off to two decimal places).
A.	10.25 mm
B.	0.25 mm
C.	1.125 mm
D.	None of these
Answer» E.

Discussion

698.	The cold forming process in which a hardened tool is pressed against a workpiece (when there is r elative mot ion bet ween t he tool and the workpiece) to produce a roughened surface with a regular pattern is
A.	Roll forming
B.	Knurling
C.	Chamfering
D.	Stip rolling
Answer» C. Chamfering

Discussion

699.	A strip of 120 mm width and 8 mm thickness is rolled between two 300 mm diameter rolls to get a strip of 120 mm width and 7.2 mm thickness. The speed of the strip at the exit is 30 m/min. There is no front or back tension. Assuming uniform roll pressure of 200 MPa in the roll bite and 100% mechanical efficiency, the minimum total power (in kW) required to drive the two rolls is _______.
A.	91.34 kW
B.	19.33 kW
C.	3.34 kW
D.	9.34 kW
Answer» E.

Discussion

700.	In a rolling operation using rolls of diameter 500 mm if a 25 mm thick plate cannot be reduced to less than 20 mm in one pass, the coefficient of friction between the roll and the plate is _____.
A.	1.1414
B.	7.1414
C.	0.1414
D.	14.1414
Answer» D. 14.1414

Discussion

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

What is the velocity of the steel at the bottom of the sprue if the sprue height is 30 cm? Assume the frictional and other losses to be 20%.

In a casting process, a vertical channel through which molten metal flows downward from pouring basin to runner for reaching the mould cavity is called

A shaft of diameter 20

In an interchangeable assembly, shafts of size 25.000

What are the upper and lower limits of the shaft represented by 60 f

A hole is specified as 40

The transformation matrix for mirroring a point in x-y plane about the line y = x is given by

A point P(1, 3, -5) is translated by 2 + 3 k + 4&jcirc; and then rotated counter clockwise by 90 about the z-axis. The new position of the point is:

Increase in carbon content in plain carbon steel raise its

Increase in rake angle causes... (A)... in chip thickness and ...(B)... in shear angle

The base of a brass bracket has to be rough ground to remove the unevenness. The 4 wheels available in the store. The appropriate wheel is

In HSS tool materials the element tungsten can be completely replaced, without changing the material property by

Hot hardness in an essential property for

In metal cutting BUE formation results in

Only negative rake angles are used with the following tool material

The material most commonly used for manufacturing of machine tool beds is.

When the depth of cut in increased, the specific cutting energy

A built up edge is formed while machining

What is the approximate% change in the life, f, of the tool with zero rake angle used in orthogonal cutting when its clearance angle, , is changed from 10 to 7 deg?

The contraction allowance provided on the pattern and core boxes compensates for the following type of contraction

Riser is designed so as to

Light impurities in the molten metal are prevented from reaching the mould cavity by providing

Converging passage is used for feeding the liquid molten metal into the mould to

When there is no room temperature change,

The pressure at the in-gate will be maximum with the gating system

Chills are used in moulds to

A mould has downsprue whose length is 20 cm and the cross sectional area at the base of the downsprue is 1 cm

Gray cast iron blocks 200 x 100 x 10 mm are to be cast in sand moulds, Shrinkage allowance for pattern making is 1%. The ratio of the volume of pattern to that of the casting will be

With a solidification factor of 0.97 106 s/m

A shear of 20 mm {S = 20 mm) is now provided on the blade. Assuming force vs displacement curve to be trapezoidal, the maximum force (in kN) exerted is

From the lists given below, choose the most appropriate set of heat treatment process and the corresponding process characteristies

A cubic casting of 50 mm side undergoes volumetric solidification shrinkage and volumetric solid contraction of 4% and 6% respectively. No riser is used. Assume uniform cooling in all directions. The side of the cube after solidification and contraction is

In a gating system, the ratio 1 : 2 : 4 represents

Match the items in Column I and Column II.

A strip with cross-sectional area 150 mm 4.5 mm is being rolled with 20% reduction of area using 450 mm diameter rollers. The angle subtended by the deformation zone at the roll centre is (in radians)

A wire of 0.1 mm dia is drawn from a rod of 15 mm diameter dies giving reductions of 20%, 40% and 80% are available. For minimum error in the final size, the number of stages and reduction at each stage respectively would be

In a slab rolling operation, the maximum thickness reduction ( h

With respect to metal working, match Group A with Group B:

A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. The diameter of the die should be (Take clearance as 3% of sheet thickness) _______.

In orthogonal machining operation, the chip thickness and the uncut chip thickness are equal to 0.45 mm. If the tool rake and is 0 deg. The shear plane angle is

The thickness of the blank needed to produce, by power spinning a missile cone of thickness 1.5 mm and half cone angle 30

10 mm diameter holes are to be punched in a steel sheet of 3 mm thickness. Shear strength of the material is 400 N/mm

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

In blanking operation the clearance is provided on

Volume of a cube of side l and volume of a sphere of radius r are equal. Both the cube and the sphere are solid and of same material. They are being east. The ratio of the solidification time of the cube to the same of sphere is

The cold forming process in which a hardened tool is pressed against a workpiece (when there is r elative mot ion bet ween t he tool and the workpiece) to produce a roughened surface with a regular pattern is

In a rolling operation using rolls of diameter 500 mm if a 25 mm thick plate cannot be reduced to less than 20 mm in one pass, the coefficient of friction between the roll and the plate is _____.