AEC 2023 CEC Preliminary Round Day 2

 What is a hydrocarbon?

• A chemical containing water

• A molecule with carbon and hydrogen 

• A non-polluting fossil fuel

• A compound produced at hydroelectric plants

 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)

CO2 flooding method is used for

• Medium and light crude oil

• Heavy crude oil

• Waxy crude oil

• None of the above

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

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

What is the difference between a platform and a rig in offshore drilling?

• A platform is a permanent structure used for drilling, while a rig is a mobile structure. 

• A rig is a permanent structure used for drilling, while a platform is a mobile structure.

• A platform is used for drilling shallow wells, while a rig is used for drilling deep wells.

• A rig is used for drilling shallow wells, while a platform is used for drilling deep wells.

 A storage tank contains 50,000 barrels of crude oil. If the density of the oil is 0.85 g/mL, what is the mass of the oil in the tank? (1 barrel = 159 L)

• 6,421,250 kg

• 7,342,500 kg

• 6,757,500 kg

• 1,785,000 kg

Which statement is FALSE?

• Naphtha is a major petrochemical feedstock.

• Kerosene is used as jet fuel.

• Bitumen is used to pave roads.

• Base oils are used to heat buildings.

Total reflux in a distillation operation requires minimum

• reboiler load.

• condenser load.

• number of plates.

• all of the above.

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.