Bissoy.com
Doctors Medicines MCQs Q&A

Refer to Q8 and, calculate the rate of loss of naphthalene from the surface per unit width.

Refer to Q8 and, calculate the rate of loss of naphthalene from the surface per unit width. Correct Answer 0.101 gmol/m.hr

Rate of loss of naphthalene = k (CAi – CA∞) = 0.014 (1 * 10–5 – 0) = 1.4024 * 10–7 kmol/m2 sec Rate of loss per meter width = (1.4024 * 10 –7) (0.2) = 2.8048 * 10 –8 kmol/m.sec = 0.101 gmol/m.hr.

Related Questions

A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat sheet of solid naphthalene of length 0.2 m with a velocity of 20 m/sec. The other data are: Mass diffusivity of naphthalene vapor in air = 6 * 10 –6 m2/sec Kinematic viscosity of air = 1.5 * 10 –5 m2.sc Concentration of naphthalene at the air-solid naphthalene interface = 1 * 10 – 5 kmol/m3 Calculate the overage mass transfer coefficient over the flat plate. Note: For heat transfer over a flat plate, convective heat transfer coefficient for laminar flow can be calculated by the equation. Nu = 0.664 ReL1/2 Pr1/3 you may use analogy between mass and heat transfer.
"It is now expected that the variable production cost per unit and the selling price per unit will each increase by 10%, and fixed production cost will rise by 25%. What will be the new break even point?
Selling price - Rs 6 per unit
Variable production cost - Rs 1.20 per unit
Variable selling cost - Rs 0.40 per unit
Fixed production cost - Rs 4 per unit
Fixed selling cost - Rs 0.80 per unit
Budgeted production and sales for the year are 10,000 units."
A lady wants to buy the following items in the given price range- 1. Tomato between Rs. 40 and Rs. 45 per kg. 2. Grapes in the price range of Rs. 80 and Rs. 90 per kg. 3. Milk packets at Rs. 23 per liter. In which shop from the following will she definitely get all her items/ A. Shop S sells tomato at Rs. 22.5 per half kg, Grapes at Rs. 82 per kg and milk at Rs. 24 per liter. B. Shop H sells grapes at Rs. 21 per quarter kg, milk at 12.5 per half litre and tomato at Rs. 22 per half kg. C. Shop O sells milk at Rs. 11.5 per half litre, tomato at 21 per half kg and grapes at Rs. 43 per half kg. D. Shop P sells tomato at Rs. 23.5 per half kg, grapes at Rs. 85 per kg and milk at Rs. 23 per litre.
"What is the company's breakeven point:
Selling price - Rs 6 per unit
Variable production cost - Rs 1.20 per unit
Variable selling cost - Rs 0.40 per unit
Fixed production cost - Rs 4 per unit
Fixed selling cost - Rs 0.80 per unit
Budgeted production and sales for the year are 10,000 units."
"How many units must be sold if company wants to achieve a profit of Rs 11,000 for the year?
Selling price - Rs 6 per unit
Variable production cost - Rs 1.20 per unit
Variable selling cost - Rs 0.40 per unit
Fixed production cost - Rs 4 per unit
Fixed selling cost - Rs 0.80 per unit
Budgeted production and sales for the year are 10,000 units."
"From the following information, calculate the extra cost of material by following EOQ:
Annual consumption = 45000 units
Ordering cost per order = Rs 10
Carrying cost per unit per annum = Rs 10
Purchase price per unit = Rs 50
Re-order quantity at present = 45000 units
There is discount of 10% per unit in case of purchase of 45000 units in bulk"
The width carriageway required will depend on the intensity and volume of traffic anticipated to use the bridge. a. Except on minor village roads all bridges must provide for at least two-lane width b. The minimum width of the carriageway is 4.25 m for a one-lane bridge c. The minimum width of the carriageway is 3.75 m for a one-lane bridge d. The minimum width of the carriageway is 7.5 m for a two-lane bridge Which of the following statement(s) given above is/are incorrect.
Which of the following statements are true/false?
1. A minimum rate of wages for the time spent by employees for the production of output is minimum time rate.
2. Minimum piece rate is the rate based on the quantity of the output employees have produced.
3. The guaranteed time rate is a minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis.
4. A minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis is overtime rate.
A tea merchant has 3 varieties of tea to sell. Brand A was sold at Rs. 252 per kg, Brand B was sold at Rs. 280 per kg, and Brand C was sold at Rs. 316 per kg. At the end of the year, he finds that he has left 274 kg of brand A tea, 197 kg of brand B and 54 kg of brand C tea. He mixes the three and sells the mixture at the rate of Rs. 283.50 per kg. What was his profit or loss on the sale? A. Rs. 7565.50 profit B. Rs. 7565.50 loss C. Rs. 8232.40 profit D. Rs. 8125.30 loss
Consider an enclosure formed by three surfaces having the following values of shape factors, emissivities and temperatures Surface 1 i.e. curved cylindrical has an emissivity 0.75 and temperature 800 K Surface 2 i.e. closing disc has an emissivity 0.8 and temperature 700 K Surface 3 i.e. closing disc has an emissivity 0.8 and temperature 700 K The closing flat discs are 25 mm in diameter and they have interspacing distance equal to 100 mm. If the shape factor between these two identical discs is 0.05, calculate the net rate of radiant heat flow from the curve surface to each of the closing end surface