Chemical Engineering MCQs

Facilitates by-products recovery

Takes 2-3 days for coking of coal but requires no external fuel for heating

Gives larger yield of coke (around 85%) as compared to by-product ovens

Produces coke with very poor strength

Caking tendency

Coking tendency

Clinkering tendency

Size stability

50

70

85

100

Height of the coal heap should be < 3 metres

Maximum 200 tons should be stored in a heap

Both A and B

Neither A nor B

Porosity

Coke reactivity index (CRI)

Critical air blast (CAB) value

Both B and C

H₂

CO

CH₄

C₂H₆

The ratio of its percentage of fixed carbon to that of volatile matter

Helpful in estimation of its rank

Both A and B

Neither A nor B

15-30

1-Feb

70-100

150-200

80-170

200-300

250-270

280-300

M = 1.8 A

M = 0.5 A

M = 1.1 A

M = A