Chemical Engineering - Chemical Engineering Basics

21. 

Factor of safety is the ratio of the __________ stress to the working stress.

A. tensile
B. compressive
C. yield
D. bearing

Answer: Option C

Explanation:

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22. 

The majority charge carriers in p-type silicon are

A. free electrons
B. ions
C. conduction electrons
D. holes

Answer: Option D

Explanation:

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23. 

Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same

A. period increases.
B. period decreases.
C. group increases.
D. both 'b' & 'c'.

Answer: Option D

Explanation:

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24. 

With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.

A. supercharging
B. wall temperature
C. compression ratio
D. engine speed

Answer: Option D

Explanation:

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25. 

Between 230 and 370°C, blue brittleness is caused in mild steel because of the

A. immobility of dislocation.
B. strain-ageing.
C. increase in Young's modulus.
D. strain hardening.

Answer: Option B

Explanation:

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