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AEC 2023 CEC Preliminary Round Day 3

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AEC 2023 CEC Preliminary Round Day 3
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30 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which option is accurate regarding one dimensional heat transfer?

Steady – f(x, y, t),

Unsteady – f(x)

Steady – f(y, z),

Unsteady – f(y)

Steady – f(x, t),

Unsteady – f(x)

Steady – f(x), Unsteady – f(x, t)

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Helium is produced on commercial scale from:

Air

Coke oven gas

Natural gas

None of these

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Choose the correct statements about crude oil.

I. Produced from petroleum.

II. Can be found floating on ponds or streams.

III. An important source of energy.

IV. Has different compositions at different locations.

I and II

II and III

I, III and IV

II, III and IV

4.

MULTIPLE CHOICE QUESTION

2 mins • 3 pts

A natural gas pipeline has an internal diameter of 30 centimetres and a length of 500 metres. The pipeline transports natural gas at a flow rate of 10,000 cubic metres per hour. The natural gas has a density of 0.7 kg/m^3 and a velocity of 5 metres per second. What is the mass flow rate of natural gas through the pipeline? 

3.02 kg/second

1.94 kg/second

1.08 kg/second

1.56 kg/second

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

Grashoff number & Prandtl number.

Reynolds number.

Grashoff number & Reynolds number.

Grashoff number.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Total reflux in a distillation operation requires minimum

reboiler load.

condenser load.

number of plates.

all of the above.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapour feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

increased reflux ratio.

increased reboiler load.

greater degree of separation with a fixed number of trays.

none of these.

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