Centrifuge Parts (match the part in Column A with the one correct function in Column B)

Column A

1. Rheostat ______

2. Bucket _______

3. Trunnion ring _____

4. Brake _______

Column B

A. sets spinning time

B. speed control

C. tube holder

D. holds bucket

E. allow for faster slow down time ?

Types of Centrifuges (match the Centrifuge name in Column A with the one correct function in Column B)

Column A

5. Cytospine

6. Horizontal head

7. Microheamatocrit

Column B

A. greater speed than angle head

B. retains good cellular detail

C. spins capillary tubes in hematology

D. better separation of layers

8. An advantage of a horizontal head centrifuge is (may be more than 1 answer)

a) gives best separation of layers

b) spins faster than angle head due to less wind resistance

c) holds more tubes

9. 8 tubes of whole blood were placed in a centrifuge. The speed was set for 2000 rpm for 10 minutes. The imbalance light came on as soon as the instrument started spinning. Choose from the list below all possible causes

a) rubber cushion missing from 1 or more buckets

b) tubes not placed opposite each other in buckets

c) blood volumes for opposite tubes not equal

d) tube sizes not all the same

10. If a method required spinning at an exact gravitational force, you must know the Relative Centrifugal Force for that centrifuge for a specific speed. The 2 things that will influence the RCF are: a) speed of rotation (RPM) b) size of the centrifuge (distance of tubes from motor shaft) c) nature of the samples to be spun RCF = 1.12R(RPM/1000)2, R= radius

11.State the steps to be followed if a tube of serum breaks in a centrifuge.

how can the diameter and hight and type of packed effect the prcess in scrubber column

1. Which of these can be statements of II law of TD? Check all that apply.

(a) Heat can flow only from cold body to hot body with no work input

(b) Heat can flow only from hot body to cold body with no work input

(c) The entropy generation in a (system+ surroundings) CV is always positive

(d) A power cycle cannot have 100% efficiency

(e) All the heat input from a heat source to a power cycle can be converted to work.

2. The meaning of perfect gas assumption is (check all that apply)

(a) The gas obeys ideal gas equation

(b) The specific heats of the gas are independent of temperature

(c) Most gases can be considered perfect gases at high temperature and low pressure, far away from the critical point of the dome shape curve on the T-v diagram. With additional assumption that the CP and Cv don’t change with temperature, it becomes a perfect gas.

(d) All of the above

3. Which of the following processes are irreversible (check all that apply)

(a) Free expansion of gas into vacuum

(b) Deceleration of a block sliding on a flat ramp.

(c) Heat transfer from a hot body to cold body

(d) Melting of ice dropped in boiling water

Despite having some of the most acidic precipitation ever recorded (acid fog), explain why the southwestern US doesn’t have as much problem with acid rain as the northeast.

(a) Explain briefly in what circumstances you would require a Packed Bed Reactor (PBR) in a chemical process. How is a PBR different from an ordinary Plug Flow Reactor (PFR). Use sketches and design equations to justify your answers. [8 marks]

(b) The data in Table Q1 were obtained for the photochemical decay of liquid bromine dissolved in water when placed in sunlight:

TABLE Q1

Time (min)   10   20    30    40    50    60 Bromine (ppm) 2.45 1.74 1.23 0.88 0.62 0.44

(i) Using graphical means show that the reaction is first-order in bromine. [12 marks]

(ii) Calculate the reaction rate constant.
[5 marks]

With two possible reactions in parallel, which type of reactor (CSTR, Batch, or Plug Flow) will you choose to maximize selectivity?

F-->P1 r1= k1(CF)^a1

F-->P2 r2= k2(CF)^a2

Methane is completely burned with 250% excess air during a steady flow combustion process. If the reactants and the products are kept at 25 ° C and 1 atmosphere and the water of the products exists in liquid form.
Determined:
to. The balanced equation
b. Heat transfer (kJ / kmol)
c. Adiabatic flame temperature (K)

Question 1: Use specimens to fill in the following table. Provide the specimen name(s) that you are using as a reference for each species (Homo species only). For most questions provide a briefdescription of the trait (1-2 sentences at most). For questions that ask about presence of a trait, simply indicate if this trait is present or absent for each species. For some questions, you may find it helpful to rank the trait across the species.

Question 2: Describe 2 trends that you observe from these species as they related to evolutionary change in our genus over time. For example, one trend that you can describe is how brain size has changed over time.

1)

2)

Question 3: List (a) two derived features of Homo neanderthalensis and (b) two derived features of Homo sapiens.

a)

b)

The production of ethyl acetate occurs in a batch reactor with two raw materials, ethanol and acetic acid, as shown with the following reaction: ??2??5???? + ????3???????? ? ????3????????2??5 + ??2??

The reaction may be written simply in the form of: ?? + ?? ? ?? + ??

The reaction rate in the liquid phase is given by: ???? = ??1???????? At 100°C: ??1 = 7.93 × 10?6 m3kmol?1 s ?1

A feed of 38.4% by weight of acid, 50% by weight of alcohol, and no ester is used to promote a 35% conversion of the acid. The density of the mixture can be assumed to remain constant at 1020 kg m?3 . The daily production rate for the production of ethyl acetate is 50 metric tonnes and the reactor will be operated 24 hours a day with the time for filling, emptying, cleaning is 1 hour total for each batch.

Determine the following:

a) Initial and final concentration of each species (don’t forget about the water) [6 marks]

b) Batch reaction time [6 marks]

c) Number of batches per day [4 marks]

d) Reactor volume for required daily production [4 marks]

DATA:

Molecular Weight of Component

A 46 kg kmol?1

B 60 kg kmol?1

R 88 kg kmol?1

S 18 kg kmol?1

Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) FDecide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has negative feedback.
(ii) Responds to changes in conditions.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F
7. Decide whether each of these statements is True (T) or False (F).
A closed-loop control system:
(i) Has a measurement system which gives feedback of a signal which is a measure of the variable being controlled.
(ii) Has a controller which has an input based on the difference between the set value and the fed back value for the variable being controlled.
1. (i) T (ii) T
2. (i) T (ii) F
3. (i) F (ii) T
4. (i) F (ii) F