Momentum Transfer - Food Engineering - Engineering Sciences Previous Year Questions

1

2008 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2008

If the combined efficiency of the pump and motor is 0.75, then the power required to run the pump is:

A

1.76 kW

B

1.92 kW

C

2.00 kW

D

2.16 kW

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2

2008 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2008

Milk having heat capacity 3900 J.kg^-1.°C^-1 and density 1020 kg.m^-3 is pressurized to 300 atmosphere gauge pressure and allowed to flow through a high pressure homogenizing valve at a rate of 60 liters per min. The diameter of the homogenizing valve through which the milk flows is 6 mm. (1 atmosphere = 101.3 kPa). Temperature rise in milk will be

A

10.1 °C

B

9.2 °C

C

7.7 °C

D

6.1 °C

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3

2008 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2008

Milk having heat capacity 3900 J.kg^-1.°C^-1 and density 1020 kg.m^-3 is pressurized to 300 atmosphere gauge pressure and allowed to flow through a high pressure homogenizing valve at a rate of 60 liters per min. The diameter of the homogenizing valve through which the milk flows is 6 mm. (1 atmosphere = 101.3 kPa). Height of the valve lift will be

A

0.06 mm

B

0.11 mm

C

0.16 mm

D

0.22 mm

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4

2014 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2014

The viscosity and density of a fruit juice at 21°C are 6.3 x 10^-3 Pa s and 1029 kg m^-3, respectively. The juice flows at the rate of 0.12 m³ min^-1 in a 2.54 cm inner diameter steel pipe. Correct combination of the Reynolds number (N_Re) and the nature of flow of juice is

A

N_Re = 1048, Laminar

B

N_Re = 2056, Laminar

C

N_Re = 16375, Turbulent

D

N_Re = 28656, Turbulent

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5

2017 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2017

Power consumption in liquid mixing is proportional to ______.

A

Power number × liquid density × (rotational speed)³ × (impeller diameter)⁵

B

Power number × liquid density × (rotational speed)² × (impeller diameter)³

C

Liquid density × viscosity of the liquid × (rotational speed)² × (impeller diameter)³

D

Acceleration due to gravity × liquid density × (rotational speed)³ × (impeller diameter)⁵

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6

2017 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2017

In a pineapple juice, fibre particles having mean diameter of 160 μm and density of 1075 kg/m³ are settling by gravity. If the density and viscosity of the juice are 1015 kg/m³ and 0.98 cp, respectively, terminal velocity of the fibre particles is ______ mm/s.

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7

2019 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2019

Impeller in a fruit juice mixing tank is rotating at 200 rpm with a Reynolds number >10⁴. Density of juice is 1045 kg m^-3. If diameter of the impeller is doubled and other conditions remained constant, the power requirement of mixing will increase by a factor of ______.

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8

2019 · Engineering Sciences · Food Engineering · Momentum Transfer

Engineering Sciences (XE) 2019

Buffalo milk having density of 1030 kg m⁻³ is homogenized with a pressure of 30 MPa. Given, acceleration due to gravity as 9.81 m s⁻² and assuming no pressure loss, the velocity (m s⁻¹) of the milk flowing through the homogenizer valve will be __________ (round off to 2 decimal places).

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