Chemical Engineering Basics MCQ Questions & Answers

31

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : C_p of copper is 23 J.K^-1 mole^-1)

A) 2300 J B) 4600 J C) 230 J D) 2.3 × 10⁶ J

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Answer & Solution

Answer: Option A

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32

While the recrystallisation temperature for pure metals is 0.3 T_m, the same for alloys is equal to __________ × T_m (where, T_m Melting temperature).

A) 0.25 B) 0.45 C) 0.70 D) 0.95

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Answer & Solution

Answer: Option C

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33

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m².°K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

A) 2 B) 5 C) 10 D) 20

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Answer & Solution

Answer: Option A

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34

M10 index of coke indicates its

A) Compressive strength B) Hardness C) Abrasion resistance D) Impact strength

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Answer & Solution

Answer: Option C

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35

Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to

A) $$\frac{{{{\text{r}}_2} - {{\text{r}}_1}}}{{{{\text{r}}_1} - {{\text{r}}_2}}}$$ B) $$\frac{{{{\text{r}}_2}\,.\,{{\text{r}}_1}}}{{{{\text{r}}_2} - {{\text{r}}_1}}}$$ C) $$\frac{{{{\text{r}}_1} + {{\text{r}}_2}}}{{{{\text{r}}_1}\,.\,{{\text{r}}_2}}}$$ D) $$\frac{{{{\text{r}}_1}\,.\,{{\text{r}}_2}}}{{{{\text{r}}_1} + {{\text{r}}_2}}}$$

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Answer & Solution

Answer: Option B

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36

The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.

A) 100 B) 200 C) 1000 D) 2000

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Answer & Solution

Answer: Option B

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37

The power of a low capacity prime mover is most suitably measured by a __________ type dynamometer.

A) Driving B) Transmission C) Absorption D) None of these

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Answer & Solution

Answer: Option C

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38

Which of the following is not a charge material for cupola ?

A) Limestone B) Iron scrap C) Iron ore D) Pig iron

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Answer & Solution

Answer: Option C

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39

To counteract the bad effects of strain hardening on a cold formed part, it must be

A) Tempered B) Normalised C) Annealed D) Hardened

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Answer & Solution

Answer: Option C

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40

A good abrasive

A) Should be friable B) Should have low refractoriness C) Is made up of large size of crystals D) Should be soft

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Answer & Solution

Answer: Option A

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Chemical Engineering Basics MCQ Questions & Answers | Chemical Engineering