Miscellaneous in Metallurgy MCQ Questions and Answers

1

The temperature of a gas flowing in a long duct as measured by thermocouple (having an emissivity of 0.5) is 800 K. The internal wall surface of the duct is at a temperature of 500 K. The convective heat transfer coefficient between the gas and the tip of the thermocouple is 100 W^-1 . K .^-1 The actual gas temperature is actually . . . . . . . . K.

A) 400 B) 500 C) 820 D) 900

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Answer & Solution

Answer: Option D

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2

Generalised Fick's law for a component i in a multicomponent solution can be written as

A) $$Ji = \sum\limits_k {{D_{ik}}} .{D_{kl}}.\nabla \;{C_i},\nabla \;{C_k}$$ B) $$Ji = \sum\limits_k^k {{D_{ik}}} \nabla \;{C_k}$$ C) Ji = D_ii. ΔC_i D) none of these

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Answer & Solution

Answer: Option D

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3

In two high reversing mill, . . . . . . . . rolls are used.

A) two horizontal B) four horizontal C) two vertical D) four vertical

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Answer & Solution

Answer: Option A

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4

A fluid is flowing with a velocity of 0.5 m/s on a plate moving with a velocity of 0.01 m/s in the same direction. The velocity at the interface of the fluid and plate is

A) 0.0 m/s B) 0.01 m/s C) 0.255 m/s D) 0.50 m/s

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Answer & Solution

Answer: Option B

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5

A tensile specimen was deformed at a constant cross head speed of 6 mm/min. The strain rate at the start of the testing was 5 × 10^-3 s^-1. The initial gauge length of the specimen (in mm) was

A) 10 B) 20 C) 35 D) 50

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Answer & Solution

Answer: Option B

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6

Hot metal at 1700 K is poured in a sand mould that is open at the top. Heat loss from the liquid metal takes place by

A) Radiation only B) Radiation and conduction only C) Radiation and convection only D) Radiation, conduction and convection

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Answer & Solution

Answer: Option D

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7

A mass flow process by which atoms changes their position relative to their neighbor in a given phase under the influence of thermal energy and concentration gradient.

A) Fick's law B) Wen's law C) Stefan's law D) None of these

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Answer & Solution

Answer: Option A

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8

The heating of eutectoid steel is done for hardening process in the range of temperature

A) above 30 - 50°C to A3 B) above 30 - 50°C to A1 C) below 30 - 50°C to Acm D) above 30 - 50°C to Acm

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Answer & Solution

Answer: Option B

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9

A glass reinforced polymer composite comprises of 35 volume % glass fiber and 65 volume % of polymer resin. The elastic moduli of glass and polymer resin are respectively 70 GPa and 3 GPa. The elastic modulus of the composite (in GPa) under iso-strain state is

A) 4.51 B) 25.45 C) 26.45 D) 27.45

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Answer & Solution

Answer: Option C

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10

What are the best precautions for eye and arc rays?

A) Goggles with filter lens B) Helmet only C) Wear cloth D) None of these

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Answer & Solution

Answer: Option A

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Miscellaneous in Metallurgy MCQ Questions and Answers | Metallurgical Engineering