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Hassan
1.The specific weight is also known as weight density.
A. Correct
B. Incorrect
C. Both (a) and (b)
D. Correct
2.The variation in the volume of a liquid with the variation of pressure is called
A. surface tension
B. compressibility
C. capillarity
D. surface tension
3.The reciprocal of compressibility is known as
A. Young’s modulus
B. expansion index
C. Bulk modulus
D. Young’s modulus
4.When a small diameter tube is dipped in water, the water rises in the tube with an upward ……….. surface.
A. flat
B. concave
C. parabolic
D. flat
5.A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because
A. it is easier to see through the glass tube
B. glass tube is cheaper than a metallic tube
C. it is not possible to conduct this experiment with any other tube
D. it is easier to see through the glass tube
6.Mercury does not wet the glass. This is due to property of the liquid known as
A. cohesion
B. adhesion
C. viscosity
D. cohesion
7.With an increase in the size of tube, the rise of depression of liquid in the tube due to surface tension will
A. decrease
B. increase
C. remain unchanged
D. decrease
8.Falling drops of water become sphere due to the property of
A. surface tension of water
B. compressibility of water
C. capillarity of water
D. surface tension of water
9.The intensity of pressure at any point, in a liquid, is
A. directly proportional to the area of the vessel containing liquid
B. directly proportional to the depth of liquid from the surface
C. directly proportional to the length of the vessel containing liquid
D. directly proportional to the area of the vessel containing liquid
10.The intensity of pressure at any point, in a liquid, is
A. directly proportional to the area of the vessel containing liquid
B. directly proportional to the depth of liquid from the surface
C. directly proportional to the length of the vessel containing liquid
D. directly proportional to the area of the vessel containing liquid
11.The space-velocity is the proper performance measure of flow reactors. The space-velocity has the units of
A. time
B. (tme)-1
C. velocity
D. time
12.The space-velocity of 2 hr-1 means
A. that every two hours one reactor volume of feed at specified conditions is being treated by the reactor
B. that two reactor volumes of feed at specified conditions are bing fed into the reactor per hour
C. that the actual reactor volume is double that of the optimum reactor volume
D. that every two hours one reactor volume of feed at specified conditions is being treated by the reactor
13. For constant-density systems, the performance equations are identical for
A. batch reactor and plug flow reactor
B. batch reactor and backmix reactor
C. plug flow reactor and backmix reactor
D. batch reactor and plug flow reactor
14.For identical feed composition, flow rate, conversion and for all positive reaction orders, the ratio of volumes of the mixed reactor to the plug flow reactor is
A. always one
B. always less than one
C. always greater than one
D. always one
15. The batch reactor has the disadvantage(s) of
A. high labour and handling cost
B. Poorer quality control of the product
C. considerable shutdown time to empty, clean out and refill
D. high labour and handling cost
16. For identical feed compostion and flow rate, N plug flow reactors in series with a total volume V gives the same conversion as a single
A. plug flow reactor of volume V
B. CSTR of volume V
C. Plug flow reactor of volume V/N
D. plug flow reactor of volume V
17.N plug flow reactors in series with a total volume V gives the same conversion as a single plug flow reactor of volume V. The above statement is true for
A. zero-order reactions only
B. first-order reactions only
C. second-order reactions only
D. zero-order reactions only
18. The optimum size ratio for two mixed reactors in series is found in general to be dependent on the kinetics of the reaction and on the conversion level. For reaction order more than one
A. the larger reactor should come first
B. the smaller reactor should come first
C. equal size reactors are best.
D. the larger reactor should come first
19. Pure gaseous reactant A (CAO = 100 millimol/litre) is fed at steady rate into a mixed reactor where it dimerizes (2A ? R). For a certain gas feed rate the concentration of A in the exit stream is fo
A. 50%
B. 33.33%
C. 40%
D. 50%
20. One litre per second of gaseous reactant A is introduced into a mixed reactor. The stoichiometry is A ? 3R, the conversion is 50% and under these conditions the leaving flow rate is 2 litres per seco
A. 1 sec
B. 2 sec
C. sec
D. 1 sec
21. In the question 109 the holding time is
A. sec
B. 3sec
C. 1 sec
D. sec
22. For a steady-state mixed reactor the space-time is equivalent to the holding time for
A. constant fluid density systems
B. variable fluid density systems
C. non-isothermal gas reactions
D. constant fluid density systems
23. In an ideal plug flow reator at steady state
A. there may be diffusion along the flow path
B. there must be lateral mixing of fluid
C. the composition of the reactant remains constant along a flow path
D. there may be diffusion along the flow path
24.In an ideal mixed reactor at steady-state
A. the composition throughout the reactor remains same
B. the exit stream has the same composition as the fluid within the reactor
C. the space-time is equivalent to holding time for constant density systems
D. the composition throughout the reactor remains same
25. For identical feed composition, flow rate, conversion and for all positive reaction orders the ratio of the volume of mixed reactor to the the volume of plug flow reactor
A. is independent of the order of reaction
B. increases with increase in the order of reaction
C. decreases with increase in the order of reaction
D. is independent of the order of reaction
26. For identical feed composition, flow rate, conversion and for zero-order reactions the ration of the volume of mixed reactor to the vomume of plug flow reactor is
A. 0
B. 1
C. < 1
D. 0
27.A first-order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is
A. minimum when the reactors are of defferent sizes
B. maximum when the reactors are equal in size
C. minimum when the reactors are equal in size.
D. minimum when the reactors are of defferent sizes
28.Which of the following are example of autocatalytic reaction?
A. Enzyme fermentation reactions
B. Microbial fermentation reactions
C. Photochemical reactions
D. Enzyme fermentation reactions
29. The exit age distribution of fluid leaving a vessel is used
A. to study the reaction mechanism
B. to study the extent of non-ideal flow in the vessel
C. to know the reaction rate constants
D. to study the reaction mechanism
30.How does the thermal conductivity of a material change with respect to change in temperature of the same material?
A. thermal conductivity of a material increases with increase in its temperature
B. thermal conductivity of a material decreases with increase in its temperature
C. thermal conductivity of a material remains same with change in its temperature
D. thermal conductivity of a material increases with increase in its temperature
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