Chemical Engineering - Chemical Engineering Basics

46. 

Lead pencil contains

A. graphite
B. lead sulphide
C. lead
D. both(b) & (c)

Answer: Option A

Explanation:

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47. 

Function of gear box is to

A. reduce the speed.
B. obtain variable speed.
C. increase the speed.
D. produce high torque.

Answer: Option B

Explanation:

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48. 

Pearlite comprises of

A. 87% cementite & 13% Fe.
B. 87% ferrite & 13% cementite.
C. 93.33% ferrite & 6.67% C.
D. 87% ferrite & 13% C.

Answer: Option B

Explanation:

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49. 

Which of the following if present in iron ore, enhances its value ?

A. Alumina
B. Alkali oxide
C. Lime & Magnesia
D. None of these

Answer: Option C

Explanation:

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50. 

As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.

A. 110
B. 85
C. 60
D. 45

Answer: Option B

Explanation:

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