Agricultural Engineering Gate 2014 Questions with Answer

Ques 27 GATE 2014

A fat rich food product remains most stable in the water activity (aw) range of

Ques 28 GATE 2014

Identify the INCORRECT statement about the relevance of various dimensionless numbers in transport processes

Ques 29 GATE 2014

Select the most appropriate option about boiling and condensation processes as expressed by the statements P, Q and R. P – The quantities of heat involved in evaporation and condensation of unit mass of fluid are identical Q – The boiling and condensation of a single compound normally occur isothermally R – The condensation is achieved at or below dew point and boiling occurs at triple point

Ques 30 GATE 2014

The observations recorded in a pulse de-husking operation are: S. No. Parameters Before de-husking After de-husking 1. Whole (split) kernel content,% 0.5 72.3 2. Broken kernel content, % 0.7 11.2 3. Mealy waste content, % 1.1 16.5 For this operation the effectiveness of wholeness (in decimal) of kernels will be ________.

Ques 31 GATE 2014

In a tray drying under adiabatic process, hot air enters the dryer at 50°C dry bulb temperature (DBT) and 10% relative humidity (RH) with enthalpy of 70.2 kJ per kg dry air. The air leaving the dryer gains 20% moisture. Considering saturated water vapour pressure as 12.349 kPa at 50°C DBT, the enthalpy of air leaving the dryer in kJ per kg dry air is __________.

Ques 32 GATE 2014

A container having volume 282.7 cm3 and total surface area 245 cm2 is completely filled with milk whose initial temperature is 25°C. The continually stirred milk container is suddenly exposed to a steam bath at 100°C. The overall heat transfer coefficient between steam and milk is 1136 W m-2 K-1. The properties of milk are: specific heat capacity = 3.9 kJ kg-1 K-1, thermal conductivity = 0.54 W m-1 K–1 and density = 1030 kg m-3. Neglecting thermal resistance and heat capacity of container walls, the necessary time required in seconds to heat milk up to the temperature of 85°C, will be ____________.

Ques 33 GATE 2014

In a continuous belt freezer, fish fillet at a feed rate of 1000 kg h–1 is frozen. The unfrozen fish having moisture content of 85% (wet basis) enters the freezer at 25°C and complete frozen fish exits at –20°C. Properties of fish are: latent heat of crystallization = 330 kJ kg-1, fixed freezing point = –2.5°C, density = 1100 kg m-3, specific heat capacity above freezing point=3.60 kJ kg-1 K-1 and specific heat capacity below freezing point = 1.97 kJ kg-1 K-1. Neglecting other heat losses in the freezer, the power requirement of the compressor (in kW) having a coefficient of performance of 2.50 is,

Ques 34 GATE 2014

A centrifuge with rotational speed of 1440 rpm is used for separating oil from a dispersion in which oil is present in the form of spherical globules of 47 µm diameter. The density of oil is 886 kg m-3. Separation occurs at an effective radius of 4 cm. Viscosity and density of water are 0.705 cP and 1000 kg m–3, respectively. The velocity of oil through water, in mm s-1, is ___________.

Ques 35 GATE 2014

Energy required to grind a given mass of particles from a mean diameter of 12 mm to 4 mm is 12 kJ kg-1. If energy consumed to grind the same mass of particles of 2 mm mean diameter to x mm mean diameter is 252 kJ kg-1, the value of x using Rittinger’s Law will be _______.

Ques 36 GATE 2014

A tray type paddy separator is used to separate paddy from a binary mixture of paddy and brown rice fed at the rate of 1600 kg h-1. Mass fractions of paddy in feed, separated paddy and separated rice are 0.2, 0.7 and 0.02, respectively. The mass of 1000 paddy grains is 24.5 g. Separation effectiveness and number of paddy grains recycled per second, respectively are

Ques 37 GATE 2014

M kg of wheat at 9.8% moisture content (wet basis) is conditioned for 6 hours in 75 kg of water. A sample of 25 g conditioned wheat is crushed and dried in hot air oven at 130°C for 1 hour that yields 20.5 g of bone dried material. The value of M is _______.

Ques 38 GATE 2014

In a food processing plant hot water at 90°C is needed at the rate of 140% of the commodity capacity. Steam at atmospheric pressure is used for heating the water available at 25°C. Latent heat of condensation at atmospheric pressure is 2257 kJ kg-1, net calorific value of hull is 12552 kJ kg-1 and specific heat capacity of water is 4.184 kJ kg-1 K-1. Steam is generated by utilizing the hulls received as by-product from the same plant at the rate of 22% of the commodity capacity. Assuming 20% heat loss, percentage of hull used with respect to the total available amount of hull is _____________.

Ques 39 GATE 2014

Choose the most appropriate word from the options given below to complete the following sentence. A person suffering from Alzheimer’s disease short-term memory loss.