Chemical
Engineering(Ph.D) (1077)
1. The
value of the momentum correction factor for the viscous flow through a circular
pipe is
A)
1.33 B)
1.50 C) 2.0 D) 1.25
2. A
Newtonian liquid (ρ = density, µ = viscosity) is flowing with velocity ν in a
tube of diameter D. let ∆ P be the pressure drop across the length L. For a
laminar flow, ∆ P is proportional to
A) L ρν2/D B) D ρν2/L C) Lµν/D2 D) µν/L 3. Prandtl number is the ratio of :
A) Mass
diffusivity to thermal diffusivity.
B) Thermal
diffusivity to Momentum diffusivity
C) Thermal
diffusivity to mass diffusivity.
D) Momentum diffusivity
to Thermal diffusivity
4. The
ratio of wall drag to total drag in Stokes’s law range is
A)
1
B) 2/3 C)
1/3 D) 4/3
5. Weight
of 56 litres of ammonia at N.T.P. is
A)
12.5 gms B) 42.5 gms C)
375.5 gms D) 2500.5 gms
6. Diffusion
coefficient in a binary gas mixture at low pressure varies with pressure
as A) P B) P2 C) 1/P D) independent of P
7. Cp-
specific heat of a gas at constant pressure, at critical temperature and
pressure:
A)
Reaches zero B)
Reaches 0.34 kcal/ kmol. K
C) Reaches infinity D)
Reaches 1 kcal/kmol. K
8. For
reversible isobaric process the exponent n in
relation PV n =
constant, has the
value
A)
1 B) 0 C)
∞ D)
444.4
9. Jigging
is a technique by which different particles can be
A)
Separated by particle size B)
Separated by particle density C)
Sepaprated by particle shape D) Mixed
10. The dew
point of a saturated gas phase is equal to
A)
Gas temperature B)
0oC
C)
0oC D)
Bubble
temperature
11. At the
inversion point , the joule Thomson coefficient is
A)
Positive B) Negative C) Zero D) Infinity
12. Leiden
frost point is concerned with A) Boiling of
liquid on hot surface
B)
Condensation of vapour on cold surface
C)
Concentration of solution by evaporation
D)
None of these
13. A
system is said to be isopiestic, if there is no
A)
Temperature change
B)
Pressure change
C)
Volume change D)
None of the above
14. On a
Mollier chart, the slope of the curve representing a reversible isothermal
process is equal to
A)
T – 1/β B)
T + 1/β C) T – β
D)
T + β
15. In
natural convection heat transfer the correlation paprameter is
|
A)
Grashof
number
|
B) Eckert number
|
|
|
C) Graetz number
16. Hardest material of the following
is :
|
D) Bond number
|
|
|
A) Calcite B) Quartz
17. 200 mesh sieve size corresponds
to
|
C) Corundum
|
D) Gypsum
|
|
A) 200 microns B) 154 microns
|
C) 74
microns
|
D) 24 microns
|
18. De-sorption
of the adsorbed solute by solvent is called
A)
Reverse osmosis B) Sublimation
C)
Dialysis D)
Elusion
19. For an
open transfer function G= k / [ (s+1).(s+2).(s+3) ] , the
number of poles are :
A)
Zero B)
One C)
Two D) Three
20. Transfer
function of a transportation lag is equal to
A)
____1_____
τs +1 B) e-τs C) eτs D)
(τs +1)
21. Working
principle of filament type optical
pyrometer is based on the
A)
Wien’s Law B)
Seeback effect C) Kirchoff’s
law
D) Peltier effect
22. Wax is
A)
Mixture of glycerides
B) A mixture of esters of
polyhydric alcohols except glycerin
C)
Liquid at room temp.
D)
Mixture of glycerides
23. Styrene butadiene rubber is commercially manufactured
by
A)
Bulk polymerization B)
Suspension
polymerization C) Solution polymerization D)
Emulsion polymerization
24. The
work done in non-flow reversible process is given by
A)
- ∫
Vdp B)
∫ pdV C)
∫ Vdp D)
VP
(2)
25. For
irreversible elementary reaction in parallel
K1 K2
A R; A
S
the
rate of disappearance of reactant A is given by
A) (K1-K2) CA B) (K1+K2) CA C) K1
CA D) K2 CA
26. For
an ideal plug flow reactor the value of the peclet number is
A)
∞ B) 0 C)1 D)
10
27. In
a mixture of benzene vapor and nitrogen gas
at a total pressure of 900 mm Hg. If the absolute humidity of the
benzene is 0.2 Kg benzene/ Kg nitrogen, the partial pressure of benzene in mm
Hg is
A)
180 B) 60.3 C) 720 D)
200
28. Which
of the following is almost absent in crude petroleum
A)
Olefins B)
Mercaptans C) Naphthenes D) Cycloparaffins
29. The
Triple point of water occurs at 0.00602 atm and
A)
100.01 oC
B) 10.01 oC C) 0.01 oC D) 0.0001 oC
30. The
two specific heats Cp and Cv are equal at
A)
0oC B) 0oK C)
0oF D) 0oR
31. Efficiency
of a Carnot Engine working between hot
reservoir at temperature T1 and sink reservoir at temperature T2
is
A)
(T1 - T2 ) / T1 B) (T1 - T2 ) / T2
C)
T1 / (T1 -
T2 ) D) T2 / (T1 - T2 )
32. Pure
carbon is burnt in oxygen. The flue gas analysis is 70% CO2, 20% CO
and 10% O2.
The percent excess oxygen used is
A)
20 B) 12.5 C) 0
D)
10
33. The
rate constant of a chemical reaction
increases by 100 times when the temperature is increased from 400
K to 500 K. Assuming transition state theory is valid, the value of E/R
is
A)
8987 K B) 8764 K C)
9210 K D) 8621 K 34. Refrigerant Freon-22 is chemically :
A)
Mono chlorodifluoro methane
B)
Di chlorodifluoro methane
C)
tri chloro mono fluoro methane
D)
tri chloro di fluoro methane 35. In a reversible
process: A) TdS = dE + dW
B)
TdS = dE – dW
C)
TdS = dW – dE
D)
TdS = dE
(3)
36. Air at 30oC
blows over a plate of 50 cm x 75 cm maintained at 260oC. If the convection heat
transfer coefficient is 25 W/m2.oC,
the heat transfer rate is :
A)
2.156 kW B) 21.56 kW C) 215.6 kW
D) 2156 kW
37. A
rectangular slab has a surface area of 1.0 m2 and is 4 cm thick. It
transmits 10 cal/sec.cm2 due to a temperature difference between its
end faces . If the coefficient of
thermal conductivity is 0.8 cal/sec0C and the cooler end is at room
temperature 200C What is the temperature of the other face
A)
30oC B) 60oC C)
70oC D)
80oC
38. In
underdamped second order response
overshoot is equal to
A)
(Decay ratio)1/2 B)
(Decay ratio)1
C)
(Decay ratio)2 D)
(Decay ratio)3
39. Solenoid
valve works like:
A)
P-D controller B)
P-I-D controller
C)
On-off controller D)
Proportional controller
40. The
conversion XA and residence time data are collected for zero order
liquid phase reaction in a stirred
tank reactor. Which of the following will be a straight line
A)
XA versus τ B) XA versus ln τ C) XA/ (1- XA) versus τ D) XA* (1- XA) versus τ
41. For the
gaseous reaction 2A B, where the feed consists of 50 mol%A and
50 mol% inerts, the expansion factor is
A) 1 B)
-0.5 C) -0.25 D) 0
42. The
root locus method , a pole of transfer function G(s) is the value of s for
which G(s) approaches
A) -1 B) 0 C)
1 D) ∞
43. An
evaporator while concentrating an aqueous solution from 10 to 40%, solids
evaporates 30,000 Kg of water. The amount of solids handled by the steam in Kgs are
A)
4000 B) 9000
C)
4600 D) 3000
44. When a
multistage tray tower uses a minimum
reflux ratio it implies
A)
Infinite trays and
maximum reboiler heat load
B)
Infinite trays and minimum reboiler heat load
C)
Minimum trays
and minimum reboiler heat load
D)
Minimum trays
and maximum reboiler heat load
45. F or
absorbing a sparingly soluble gas in a liquid
A)
Gas side mass transfer coefficient should be increased
B)
Liquid side mass transfer coefficient should be increased
C)
Liquid side mass transfer coefficient should be
decreased D) Mass transfer coefficient
must be kept consistent
(4)
46. The
theoretical minimum work required to
separate one mole of a liquid mixture at 1 atm, containing 50 mol% each of n-
heptane and n – octane, into pure
compounds each at 1 atm is
A)
- 2 RT ln 0.5
B)– RT ln 0.5
C)
0.5 RT D)
2 RT
47. Fluidized
beds are formed when
A)
Gravity force is
less than fluid friction
B)
Fluid friction is
zero
C)
Pressure forces equal gravity forces
D)
Sum of fluid
friction and pressure forces is equal
and opposite to gravity forces
48. A counter flow heat exchanger is used to heat
water from 200C to 80 0C
by using hot exhaust gas entering at 1400C and leaving at 800C.
The log mean temperature difference for the heat exchanger is
A)
80 0C
B) 60 0C C) 110 0C D) None of the above
49. An
investment of Rs 100 lakhs is to be made for construction of plant which will
take two years to start production. The annual profit from operation of the
plant is Rs 20 lakhs. What will be the payback time
A)
5 years B) 7 years C) 12 years D)
10 years
50. For a
first order chemical reaction in a porous catalyst, the thiele modulus is 10.
The effectiveness factor is approximately equal to
A)
1 B) 0.1 C)
0.15 D) 0
x-x-x
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