Quiz FST 209 (Chap 1 - Chap 2)

All physical quantities given below are base quantity, EXCEPT

• Temperature

• Time

• Volume

• Mass

Convert 225 lb.ft^-3 to kg.m^-3. Given 1 kg = 2.2046 Ib and 1 ft = 0.3048 m.

• 2.89 kg.m^-3

• 334.84 kg.m^-3

• 1098.56 kg.m^-3

• 3604.19 kg.m^-3

Physical quantities are measured using a wide variety of unit systems. State the British unit for weight.

• Kilograms

• Watts

• Grams

• Pounds

The radius of a sphere is given by 5 mm. Compute the area of the sphere with System International units (S.I. units). Given 1 ft = 12 in, 1 in = 2.54 cm, 1 cm = 10 mm and 1 m = 100 cm.

• 78.55 ft²

• 3.142 X 10^-4 m²

• 1.047 X 10^-4 m²

• 7.855 X 10^-5 cm²

In the drying process of wet potatoes, a certain amount of water in wet potatoes has been removed. If the system is in a steady state, identify the material output from this process.

I. Wet potatoes

II. Dry potatoes

III. Water

IV. Accumulation of potatoes in the machine

• I only

• II only

• II and III only

• II, III and IV only

Find the amount of water required to raise the moisture content of 30 kg of a material from 20% to 50%.

• 9 kg

• 18 kg

• 39 kg

• 48 kg

The sequence for solving mass balance problems are:

• Search suitable basis equations, collect data inlet and outlet streams, draw informative block diagram and solve the unknown

• Draw informative block diagrams, collect data inlet and outlet streams, solve the unknown and search suitable basis equations.

• Collect data inlet and outlet streams, draw informative block diagrams, search suitable basis equations and solve the unknown.

• Solve the unknown, search suitable basis equations, draw informative block diagrams and collect data inlet and outlet streams.

For 100 kg air consists of 75% by weight of nitrogen and 25% by weight of oxygen. Oxygen has a molar mass of 16 g/mol and nitrogen has a molar mass of 14 g/mol.  Calculate the mole fraction of nitrogen.

• 0.7742

• 2.6786

• 3.4599

• 28

In the concentration of mango juice, a 250 kg/h raw juice enters the evaporator machine. In the evaporator, water is removed. Calculate the rate of production of juice concentrate containing 51% total solids from raw juice which contains 20% solids. Assume that the process is in steady state.

• 0.0102 kg/h

• 50 kg/h

• 98.04 kg/h

• 151.95 kg/h