GATE PI kind:question PYQs & Answers — Page 31

Questions 301–310 of 650. Imported answers require independent review unless marked reviewed.

Match the processing steps related to production of powder metallurgy parts with their descriptions.

Processing step	Description
P — Atomization	1 — Blend powders are pressed into shapes using dies and pressure
Q — Sintering	2 — A process for producing metal powder
R — Compaction	3 — Metal powders are heated below their melting points to allow bonding
S — Infiltration	4 — A slug of low melting point metal is placed in contact with the sintered part and heated
	5 — Metal powders are heated significantly above their melting points for bonding

Your answerChoose one option.

P-1, Q-5, R-2, S-3

P-3, Q-2, R-1, S-5

P-2, Q-3, R-1, S-4

P-2, Q-5, R-1, S-4

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In an assembly comprising shaft and hole, the nominal sizes with tolerances are specified as

Hole: 25.000

mm,

Shaft: 25.000

mm.

The type of fit is

Your answerChoose one option.

Clearance fit

Interference fit

Transition fit

Running fit

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In a manufacturing system, for four different types of products (P, Q, R and S) are produced. The batch size of each product is

. The numbers of defective units are 60, 71, 80 and 55, for P, Q, R and S, respectively. Which one of the following statements is TRUE?

Your answerChoose one option.

All products conform to six sigma standard.

Only product S conforms to six sigma standard.

Except R, all other products conform to six sigma standard.

Products P and S conform to six sigma standard.

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Match the processes of product development with their characteristics.

Process	Characteristic
P — Product synthesis	1 — Process of conversion of conceptual design into engineering science based model
Q — Product simplification	2 — Process related to design conceptualization
R — Product analysis	3 — Process of maintaining uniformity and consistency
S — Product standardization	4 — Process of reducing the number of parts without losing the functionalities

Your answerChoose one option.

P-2, Q-4, R-1, S-3

P-2, Q-3, R-1, S-4

P-4, Q-3, R-1, S-2

P-4, Q-3, R-2, S-1

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The value of

is ____________. [round off to one decimal place]

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A thick-cylinder has inner diameter of 20 mm and outer diameter of 40 mm. It is subjected to an internal pressure of 100 MPa. Follow the convention of taking tensile stress as positive and compressive stress as negative. The sum of radial and hoop stresses (in MPa) at a radius of 15 mm is____________. [round off to two decimal places]

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A shaft is used to transmit a power of 10 kW. The shear yield stress of the material is 150 MPa and factor of safety is 2. The shaft rotates at 1440 revolutions per minute. The diameter of the shaft (in mm) based on static strength is____________. [round off to two decimal places]

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Air at an initial temperature and pressure of 15 °C and 1 bar, respectively is heated in an irreversible process. The final temperature and pressure are 303 °C and 2 bar, respectively. Take gas constant for air as R = 287 J/kg-K, the ratio of the specific heats as γ = 1.4, and treat air as a calorically perfect gas. The change of entropy (in J/kg-K) in the process is____________. [round off to nearest integer]

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During a hot-working process, the homologous temperature is 0.8. The melting point of the work metal is 800 °C. The temperature (in °C) during hot-working is____________. [round off to nearest integer]

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A workpiece of 30 mm diameter and 40 mm height is compressed between two plates in an open die forging process. Assume a perfectly plastic material with a flow stress of 300 MPa. The ideal forging load (in kN) at 30% reduction (in height) is____________. [round off to nearest integer]

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