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# Alloy Steel And Cutting Tool Materials - MCQ Test 2

## 30 Questions MCQ Test Mock Test Series - Mechanical Engineering (ME) for GATE 2020 | Alloy Steel And Cutting Tool Materials - MCQ Test 2

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This mock test of Alloy Steel And Cutting Tool Materials - MCQ Test 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 30 Multiple Choice Questions for Mechanical Engineering Alloy Steel And Cutting Tool Materials - MCQ Test 2 (mcq) to study with solutions a complete question bank. The solved questions answers in this Alloy Steel And Cutting Tool Materials - MCQ Test 2 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Alloy Steel And Cutting Tool Materials - MCQ Test 2 exercise for a better result in the exam. You can find other Alloy Steel And Cutting Tool Materials - MCQ Test 2 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

### The correct sequence of elements of 18-4-1 HSS tool is

Solution:

Ans. (a)

QUESTION: 2

Solution:

Ans. (b) The blade of a power saw is made of high speed steel.

QUESTION: 3

### The alloying element mainly used to improve the endurance strength of steel materials is

Solution:

Ans. (b)

QUESTION: 4

The alloy steel designated as 40 Cr18 Ni 2 by Bureau of Indian Standards contains

Solution:

Ans. (a)

QUESTION: 5

Percentage of various alloying elements present in different steel materials are given below:
1. 18% W; 4% Cr; 1% V; 5% Co; 0.7% C
2. 8% Mo; 4% Cr; 2% V; 6% W; 0.7% C
3. 27% Cr; 3% Ni; 5% Mo; 0.25% C
4. 18% Cr; 8% Ni; 0.15% C
Which of these relate to that of high speed steel?

Solution:

Ans. (b)

QUESTION: 6

The main alloying elements in high speed Steel in order of increasing proportionare

Solution:

Ans. (a)

QUESTION: 7

Match List I (Alloying Element) with List II (Effect on Steel) and select the correct answer using the code given below the Lists:
List I                                                    List II
A. Vanadium                            1. Increases endurance strength
B. Molybdenum                        2. Improves creep properties
C. Silicon                                  3. Increases hardness
D. Chromium                            4. Increases resistance to high temperature oxidation
Codes: A B C D                      A B C D
(a) 2 1 3 4                  (b) 1 3 2 4
(c) 2 1 4 3                   (d) 1 2 3 4

Solution:

Ans. (d)

QUESTION: 8

Consider the following statements in respect of austenitic stainless steels:1. Austenitic stainless steels are hardened and strengthened by cold working.
2. Austenitic stainless steels cannot be quenched and tempered.
Which of the statements given above is/are correct?

Solution:

Ans. (c)
• Austenitic stainless steels usually contain 18% Cr and 8% Ni in addition to other minor alloying elements. Ni stabilizes the austenitic phase assisted by C and N. Other alloying additions include Ti, Nb, Mo (prevent weld decay), Mn and Cu (helps in stabilizing austenite).
• These steels are very tough and can be forged and rolled but offer great difficulty in machining.
• These steels cannot be hardened by quenching, in fact they are softened by rapid cooling from about 1000°C.

QUESTION: 9

Assertion (A): For high-speed turning of magnesium alloys, the coolant or cuttingfluid preferred is water-miscible mineral fatty oil.
Reason (R): As a rule, water-based oils are recommended for high-speed operations in which high temperatures are generated due to high frictional heat.Water being a good coolant, the heat dissipation is efficient.

Solution:

Ans. (a)

QUESTION: 10

18/8 stainless steel contains

Solution:

Ans. (b)

QUESTION: 11

Match List I with List IT and select the correct answer using the codes given below the lists:
List - I (Cutting tool Material)                 List - I I(Major characteristic constituent)
A. High speed steel                               1. Carbon
B. Stellite                                                2. Molybdenum
C. Diamond                                            3. Nitride
D. Coated carbide tool                           4. Columbium
5. Cobalt
Codes: A B C D                              A B C D
(a) 2 1 3 5                           (b) 2 5 1 3
(c) 5 2 4 3                           (d) 5 4 2 3

Solution:

Ans. (b) High speed steel, in addition to W, Cr & V, has Mo as the most influencing
constituent. Thus A matches with 2. Non ferrous alloys (stellites) are high in cobalt. Thus B matches with 5. The major constituent of diamond is carbon. Thus C matches with 1. Coated carbide tools are treated by nitriding. Thus D matches with 3.

QUESTION: 12

Match List I (Alloy) with List II (Major Constituent) and select the correct answer using the code given below the Lists:
List I                                                            List II
A. Babbitt                                               1. Nickel
B. Invar                                                  2. Tin and lead
C. Gun Metal                                         3. Aluminium
D. Duralumin                                         4. Copper
Code: A B C D                                A B C D
(a) 2 4 1 3                             (b) 3 1 4 2
(c) 2 1 4 3                             (d) 3 4 1 2

Solution:

Ans. (c) A. Babbitt - 85% lead, 5% tin, 10% antimony, and 0.5% copper
B. Invar - 64% Fe, 36% Ni
C. Gun metal is a type of bronze: 83% Cu 14% Tin, 3% Zinc, 0.8% Phosphorus.
D. Duralumin - Al 94%, Cu 4%, other(Si, Mn, Mg) 2%

QUESTION: 13

Invar is used or measuring tapes primarily the to its

Solution:

Ans. (c)

QUESTION: 14

The straight grades of cemented carbide cutting tool materials contain

Solution:

Ans. (c)

QUESTION: 15

Match List-I with List-II and select the correct answer using the codes given below the Lists:
List I                                                        List II
(Materials)                                         (Applications)
A. Tungsten carbide                         1. Abrasive wheels
B. Silicon nitride                               2. Heating elements
C. Aluminium oxide                          3. Pipes for conveying liquid metals
D. Silicon carbide                             4. Drawing dies
Code: A B C D                          A B C D
(a) 3 4 1 2                       (b) 4 3 2 1
(c) 3 4 2 1                      (d) 4 3 1 2

Solution:

Ans. (d) WC is used for drawing dies, silicone nitride for pipes to carry liquid metal, Al2O3 for abrasive wheels, and silicon carbide for heating elements.

QUESTION: 16

For improving the strength of steel at elevated temperatures, which one of the following alloying element is used?

Solution:

Ans. (b)

QUESTION: 17

Cubic boron nitride is used

Solution:

Ans. (d) None of the uses is true for CBN.

QUESTION: 18

Addition of which of the following improves machining of copper?

Solution:

Ans. (d)

QUESTION: 19

Consider the following statements: An increase in the cobalt content in thestraight carbide grades of carbide tools
1. Increases the hardness.
2. Decreases the hardness.
3. Increases the transverse rupture strength
4. Lowers the transverse rupture strength.
Which of the statements given above are correct?

Solution:

Ans. (d)

QUESTION: 20

Which one of the following is not a ceramic?

Solution:

Ans. (d)

QUESTION: 21

Which one of the following elements is an austenitic stabilizer?

Solution:

Ans. (c) Nickel and Manganese are Austenitic stabilizers.

QUESTION: 22

Which of the following elements given below determine(s) the maximum attainable hardness in steel?
1. Chromium
2. Manganese
3. Carbon
4. Molybdenum
elect the correct answer using the code given below:

Solution:

Ans. (c) Molybdenum – Because of this lowering of the transformation point, molybdenum is most effective in producing desirable oil-hardening and air-hardening properties. Except for carbon, it has the
greatest hardening effect. Ni, Cr and Mo alloying additions improve hardenability of Medium carbon steels. Therefore 1 and 4 is correct but we have forgotten the effect of carbon on steel.

QUESTION: 23

Consider the following tool materials:
1. HSS
2. Cemented carbide
3. Ceramics
4. Diamond
The correct sequence of these materials in decreasing order of their cutting speed is

Solution:

Ans. (c) Why Diamond is not used in high speed? Diamond has a tendency to revert at high temperatures (700°C) to graphite and/or to oxidize in air. But ceramics are applicable upto 1300°C. So highest cutting speed with ceramics.

QUESTION: 24

Which one of the following elements is a ferritic stabilizer?

Solution:

Ans. (d) Chromium, Tungsten and Molybdenum are ferritic stabilizer.

QUESTION: 25

Cermets are

Solution:

Ans. (d)

QUESTION: 26

Small percentage of boron is added to steel to

Solution:

Ans. (a)
Boron improves the deep hardening of constructional steels and produces therefore core hardness steels. With austenitic 18/8 crome-nickel, steels can achieve higher elastic limits by the process or precipitation hardening, but the corrosion resistance is lowered.

QUESTION: 27

Assertion(A): In high speed steels, alloying elements tungsten, chromium andvanadium are added to make them suitable to work at higher speeds than toolsteel or low alloy steels.Reason(R): Vanadium adds to the property of red hardness and tungsten andchromium add to high wear resistance.

Solution:

Ans. (a) Both A and R are true and R is the correct explanation of A

QUESTION: 28

A machinist desires to turn a round steel stock of outside diameter 100 mm at 1000rpm. The material has tensile strength of 75 kg/mm2. The depth of cut chosen is 3mm at a feed rate of 0.3 mm/rev. Which one of the following tool materials will be suitable for machining the component under the specified cutting conditions?

Solution:

Ans. (b) Cutting speed in this case is 314 m / min, at which ceramic is suited.

QUESTION: 29

Which of the following methods are suitable for the production of super alloys?
1. Atomization from molten state using inert gas.
2. Atomization using plasma arc and rotating electrode.
3. Reduction and crushing.
Select the correct answer using the codes given below:Codes:

Solution:

Ans. (b)

QUESTION: 30

Consider the following tool materials:
1. Carbide
2. Cermet
3. Ceramic
4. Borazon.
Correct sequence of these tool materials in increasing order of their ability to retain theirhot hardness is

Solution:

Ans. (a)