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193.

Pearlite phase in an iron-carbide phase diagram is
(a) eutectic phase
(b) hypoeutectic phase
(c) eutectoidal mixture
(d) hypereutectic phase

asked in Mechanical Paper-2, 2010

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194.

Consider the following parts:
1. Grinding wheel
2. Brake lining
3. Self-lubricating bearings
Which of these parts are made by powders metallurgy technique?
(a) 1,2 and 3
(b) 2 only
(c) 2 and 3
(d) 1 and 2

asked in Mechanical Paper-2, 2010

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195.

The hardness of lathe bed material should be measured by
(a) Rockwell tester
(b) Brinell hardness tester
(c) Shore scleroscope
(d) Vickers hardness tester

asked in Mechanical Paper-2, 2010

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196.

Consider the following statements regarding annealing process:
1. All structural imperfections are removed.
2. The hypoeutectoid steel is heated to about 50 -70 DC below upper critical temperature.
3. Cooling can be done in heat treating furnace by heating it, keeping the metal in it and turning off furnace till it cools to room temperature.
4. Uniform grain structure is resulted.
Which of these statements are correct?
(a) 1, 2 and 3
(b) 2, 3 and 4
(c) 1, 3 and 4
(d) 1, 2, 3 and 4

asked in Mechanical Paper-2, 2010

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197.

Consider the following:
1. Water
2. Ice
3. Brine solution
4. Oil
Which of these is/are used as quenching media in case of alloy steels?
(a) 1,2 and 3
(b) 2, 3 and 4
(c) 1 and 4
(d) 4 only

asked in Mechanical Paper-2, 2010

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198.

Match List I and List II and select the correct answer using the codes given below the lists.

List I (Quenching media)
A. Water
B. Oil
C. Air
D. Furnace coal
List II (Structure produced)
1. Course pearlite
2. Martensite
3. Very fine pearlite
4. Fine pearlite

a. A→1, B→3, C→4, D→2
b. A→2, B→3, C→4, D→1
c. A→1, B→4, C→3, D→2
d. A→2, B→4, C→3, D→1

asked in Mechanical Paper-2, 2010

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