GATE XE purpose:exam-prep PYQs & Answers — Page 174

Questions 1731–1740 of 1772. Imported answers require independent review unless marked reviewed.

Topic practice 1772 questionsPage 174 of 178

A pure strain with generation time of 60 min is used in a fermentation process. Following inoculation (0 h), the strain takes 2 h for adaptation, 10 h to achieve maximum growth and 12 h to arrive at the point where the death rate is higher than the growth rate. If the inoculation load is 100 cells, the total population at the end of 10 h will be ______.

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Refer the shear stress – shear rate plot shown in the figure below. Match the lines (Column I) with appropriate rheological behavior (Column II).

Column I: P. Line 1; Q. Line 2; R. Line 3; S. Line 4.

Column II: 1. Dilatant; 2. Newtonian; 3. Pseudoplastic; 4. Bingham plastic

Diagram for Engineering Sciences question 135

Your answerChoose one option.

P-2, Q-3, R-4, S-1

P-1, Q-3, R-4, S-2

P-2, Q-4, R-3, S-1

P-4, Q-3, R-2, S-1

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Water flowing at a rate of 1 kg/min is heated from 12 to 80 °C with flue gas supplied at a rate of 3 kg/min. The temperature and specific heat of the flue gas are 180 °C and 1.05 kJ/kg.K, respectively. If specific heat of water is 4.2 kJ/kg.K and the flow is parallel, then the logarithmic mean temperature difference will be ______ °C.

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The Lineweaver-Burk plot of an enzymatic reaction shows V

of 160 μmol/l.min and k

of 60 μmol/l. For a substrate concentration of 40 μmol/l, the velocity of the reaction is estimated to be ______ μmol/l.min.

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Bread is wrapped in 0.1 mm thick cellophane film having water vapor permeability of 1.82 × 10

water (STP)/s.m

.atm/m at 38 °C. If the surface area of pack, vapor pressure of water inside and outside of the pack is 0.20 m

, 10 mm Hg and 5 mm Hg, respectively, the loss of water vapor at 38 °C in g/day is ______.

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Match the following methods / system (column I) with the appropriate operations (column II).

Column I: P. Parboiling; Q. Pearling; R. Wet milling; S. Degerming; T. Break rolls; U. Crushing rolls.

Column II: 1. Sugarcane juice extraction; 2. Hydrothermal treatment; 3. Corn milling; 4. Wheat milling; 5. Barley processing; 6. Pulse milling

Your answerChoose one option.

P-4, Q-1, R-3, S-6, T-2, U-5

P-4, Q-5, R-2, S-6, T-1, U-3

P-3, Q-5, R-2, S-1, T-3, U-4

P-2, Q-5, R-6, S-3, T-4, U-1

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A 12 mm thick fish fillet having 80% moisture content (wet basis) is to be frozen using a plate freezer. The plates are maintained at -35 °C. Assume the heat transfer coefficient, initial freezing temperature and latent heat of fusion are 2.0 W/m

.K, -2 °C and 330 kJ/kg, respectively. If the density and thermal conductivity of frozen fish fillet are 1050 kg/m

and 1.48 W/m·K, respectively, the time required to freeze the fillet from the initial freezing temperature is ______ h.

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A suspension containing 2 × 10

spores of organism A having a D

value of 1.5 min and 8 × 10

spores of organism B having a D

value of 0.8 min is heated at a constant temperature of 121.1 °C. The heating time needed to obtain a probability of spoilage ‘1 in 100’ is ______ min.

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In an evaporation process, a compressor picks up 0.05 m

air in each revolution and compresses 500 kg of air per minute. If the specific volume of air is 0.9 m

/kg, then the compressor speed is ______ rpm.

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For a soybean oil extraction system, solvent : soy ratio is maintained at 0.5 : 1 (w/w). Original seed contains 18% oil (w/w). If the meal (soy solid) after final desolventization has 0.01 kg oil per kg oil free meal then, the effectiveness of the solvent (kg oil/kg solvent) in the extraction process is ______.

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GATE XE purpose:exam-prep PYQs

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Question 143