GATE XE format:nat PYQs & Answers — Page 45 — Exam Papers

Questions 441–450 of 668. Imported answers require independent review unless marked reviewed.

Topic practice 668 questionsPage 45 of 67

The whole milk at 22 °C is pumped through a stainless steel pipe at a flow rate of 3 L s⁻¹. The length and inner diameter of the pipe are 40 m and 4 cm, respectively. If viscosity and density of the milk at the pumping temperature of 0.2 Pa s and 1032 kg m⁻³, respectively, the Reynolds number (rounded off to nearest integer) will be ______.

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A hammer mill, operating at a feed rate of 108 ton h⁻¹, consumes 10 kW power for reducing size of wheat grain from 3.2 mm to 1.25 mm. If Bond’s law holds good, the feed rate (round off to 2 decimal places) for reducing the size of the wheat grain to 0.75 mm at the same power consumption level is ______ ton h⁻¹.

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During spray drying of a milk sample, inlet and outlet temperatures are maintained at 132 °C and 80 °C, respectively. If the ambient temperature is 29 °C, the thermal efficiency (round off to 2 decimal places) of the dryer will be ______ %.

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An orange juice flowing at 0.80 kg s⁻¹ enters a counter current double pipe heat exchanger at 20 °C and leaves at 72 °C. Inlet and outlet temperatures of the hot water used as heating medium in the exchanger are 81 °C and 74 °C, respectively. The specific heat of the orange juice is 3.74 kJ kg⁻¹ K⁻¹ and overall heat transfer coefficient is 492 W m⁻² K⁻¹. The heat transfer surface area (round off to 2 decimal places) will be ______ m².

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Consider a dry parcel at 30 °C in an isothermal environment at 25 °C. The parcel rises adiabatically by 1 km. Assuming g = 10 m s⁻² and air density = 1 kg m⁻³, the buoyancy force at the new location (rounded off to 2 decimal places) is ______ m s⁻².

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The emissivity of polluted air that reflects and transmits 20% and 60% of the incoming solar radiation, respectively, at a given wavelength (correct up to 1 decimal place) is ______.

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Given that the angular velocity of rotation of the Earth = 7.3 × 10⁻⁵ s⁻¹, the period of inertial oscillations generated in the ocean by surface winds at 30° N latitude (rounded off to the nearest integer) is ______ hours.

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A tornado is in cyclostrophic balance where the horizontal pressure gradient and centrifugal forces balance each other. Consider a tornado with 100 m radius and a tangential velocity of 100 m s⁻¹ at the edge. Assuming air density = 1 kg m⁻³, the magnitude of the pressure-drop between the centre and the edge of the tornado is ______ kg m⁻¹ s⁻².

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While driving south a distance of 1000 km, the temperature outside your car increases from 10 °C to 20 °C. Assuming the air is completely dry, g = 10 m s⁻² and Coriolis parameter = 10⁻⁴ s⁻¹, the vertical gradient of the geostrophic wind (rounded off to 2 decimal places) is ______ m s⁻¹ km⁻¹.

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A westerly wind of 10 m s⁻¹ is blowing at a location in the Pacific Ocean in the northern hemisphere. Assuming density of sea water = 1000 kg m⁻³, Coriolis parameter = 10⁻⁴ s⁻¹ and drag coefficient for sea water = 10⁻⁶, the Ekman transport due to the wind at that location is ______ kg m⁻¹ s⁻¹.

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