The falling rate period in the drying of a solid is characterised by (A) Increase in rate of drying (B) Increasing temperatures both on the surface and within the solid (C) Decreasing temperatures (D) None of these

The falling rate period in the drying of a solid is characterised by
(A) Increase in rate of drying
(B) Increasing temperatures both on the surface and within the solid
(C) Decreasing temperatures
(D) None of these
by

1 Answer

Answer :

(B) Increasing temperatures both on the surface and within the solid
by

Related questions

The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid). (A) √T (B) T (C) T 2 (D) T

Description : The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid). (A) √T (B) T (C) T 2 (D) T

Last Answer : (C) T

During the constant rate period of drying of a solid, (A) Increased air humidity decreases the rate of drying (B) Increasing the air temperature decreases the drying rate (C) Surface evaporation of unbound moisture occurs (D) None of these

Description : During the constant rate period of drying of a solid, (A) Increased air humidity decreases the rate of drying (B) Increasing the air temperature decreases the drying rate (C) Surface evaporation of unbound moisture occurs (D) None of these

Last Answer : (C) Surface evaporation of unbound moisture occurs

Pick out the correct statement. (A) Bound moisture is removed during constant rate drying period (B) Free moisture is removed during falling rate drying period (C) The sum of free moisture and equilibrium moisture in a solid is called the critical moisture (D) The driving force for mass transfer in a wet solid is its free moisture content

Description : Pick out the correct statement. (A) Bound moisture is removed during constant rate drying period (B) Free moisture is removed during falling rate drying period (C) The sum of free moisture and ... (D) The driving force for mass transfer in a wet solid is its free moisture content

Last Answer : (D) The driving force for mass transfer in a wet solid is its free moisture content

The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid). (A) √T (B) T (C) T 1.5 (D) T

Description : The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid). (A) √T (B) T (C) T 1.5 (D) T

Last Answer : (B) T

In the constant rate period of the rate of drying curve for batch drying, (A) Cracks develop on the surface of the solid (B) Rate of drying decreases abruptly (C) Surface evaporation of unbound moisture occurs (D) None of these

Description : In the constant rate period of the rate of drying curve for batch drying, (A) Cracks develop on the surface of the solid (B) Rate of drying decreases abruptly (C) Surface evaporation of unbound moisture occurs (D) None of these

Last Answer : (C) Surface evaporation of unbound moisture occurs

With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible. (A) Increases (B) Decreases (C) Remain same

Description : With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible. (A) Increases (B) Decreases (C) Remain same

Last Answer : (A) Increases

Pick out the wrong statement. (A) In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2 (B) Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number (C) Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger (D) Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

Description : Pick out the wrong statement. (A) In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2 (B) Sherwood number in mass transfer corresponds to ... tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

Last Answer : (C) Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger

The critical moisture content in case of drying indicates the __________ rate period. (A) Beginning of falling (B) Beginning of constant (C) End of falling (D) None of these

Description : The critical moisture content in case of drying indicates the __________ rate period. (A) Beginning of falling (B) Beginning of constant (C) End of falling (D) None of these

Last Answer : (A) Beginning of falling

For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same. (A) Unsaturated surface (B) Constant rate (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same. (A) Unsaturated surface (B) Constant rate (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

During constant rate period, the rate of drying decreases with the (A) Decrease in air temperature (B) Increase in air humidity (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : During constant rate period, the rate of drying decreases with the (A) Decrease in air temperature (B) Increase in air humidity (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

The increasing vapor pressure caused by heating a liquid is due to------? A. increase inter-molecular interactions B. increasing potential energy of molecules C. increasing kinetic energy of molecules (Answer) D. decreasing surface tension

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Last Answer : C. increasing kinetic energy of molecules (Answer)

When a firm enters the law of diminishing returns to scale (a) TVC curve begins to fall at an increasing rate (b) TVC curve begins to increase at an increasing rate (c) TVC curve begins to fall at an decreasing rate (d) TVC curve begins to increase at an decreasing rate

Description : When a firm enters the law of diminishing returns to scale (a) TVC curve begins to fall at an increasing rate (b) TVC curve begins to increase at an increasing rate (c) TVC curve begins to fall at an decreasing rate (d) TVC curve begins to increase at an decreasing rate

Last Answer : (a) TVC curve begins to fall at an increasing rate 

During drying of a solid, the critical moisture content increases with (A) Decreased drying rate (B) Increased thickness of the solid (C) Increased drying rate (D) Both (B) and (C)

Description : During drying of a solid, the critical moisture content increases with (A) Decreased drying rate (B) Increased thickness of the solid (C) Increased drying rate (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, (A) The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant (B) Both the spheres will emit equal amount of radiation per unit time in the beginning (C) Both will absorb equal amount of radiation from the surrounding in the beginning (D) Both (B) & (C)

Description : A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, (A) The cooling rate will be the same for the two spheres and hence the ... equal amount of radiation from the surrounding in the beginning (D) Both (B) & (C)

Last Answer : (D) Both (B) & (C)

Total momentum within a closed system is A. increasing B. decreasing C. zero D. constant

Description : Total momentum within a closed system is A. increasing B. decreasing C. zero D. constant

Last Answer : constant

Soaps remove dirt by (A) Increasing the surface tension (B) Decreasing wettability (C) Supplying hydrophilic group (D) None of these

Description : Soaps remove dirt by (A) Increasing the surface tension (B) Decreasing wettability (C) Supplying hydrophilic group (D) None of these

Last Answer : (D) None of these

The emf of a Deniell cell “Zn | Zn2+|| Cu2+| Cu” can be increased by (A) Decreasing the surface area of the electrodes (B) Increasing the concentration of zinc sulphate solution (C) Increasing the surface area of the electrodes (D) Increasing the concentration of copper sulphate solution

Description : The emf of a Deniell cell “Zn | Zn2+|| Cu2+| Cu” can be increased by (A) Decreasing the surface area of the electrodes (B) Increasing the concentration of zinc sulphate solution (C) Increasing the surface area of the electrodes (D) Increasing the concentration of copper sulphate solution

Last Answer : (D) Increasing the concentration of copper sulphate solution

Flights in a rotary dryer are provided to (A) Lift and shower the solids thus exposing it thoroughly to the drying action of the gas (B) Reduce the residence time of solid (C) Increase the residence time of the solid (D) None of these

Description : Flights in a rotary dryer are provided to (A) Lift and shower the solids thus exposing it thoroughly to the drying action of the gas (B) Reduce the residence time of solid (C) Increase the residence time of the solid (D) None of these

Last Answer : (A) Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate. (A) Increases (B) Decreases (C) Does not affect

Description : Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate. (A) Increases (B) Decreases (C) Does not affect

Last Answer : (B) Decreases

A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process? (A) Flow rate of inlet air (B) Relative humidity of outlet air (C) Humidity of inlet air (D) Temperature of the solid

Description : A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process? (A) Flow rate of inlet air (B) Relative humidity of outlet air (C) Humidity of inlet air (D) Temperature of the solid

Last Answer : (D) Temperature of the solid

Unsteady uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Description : Unsteady uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Last Answer : (B) Long pipe at decreasing rate

Steady non-uniform flow is exemplified by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Description : Steady non-uniform flow is exemplified by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Last Answer : (D) Expanding tube at constant rate

Unsteady non-uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Description : Unsteady non-uniform flow is represented by flow through a/an (A) Long pipe at constant rate (B) Long pipe at decreasing rate (C) Expanding tube at increasing rate (D) Expanding tube at constant rate

Last Answer : (C) Expanding tube at increasing rate

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Description : Conversion achieved in HNO3 synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by (A) Decreasing the pressure (B) Decreasing the temperature (C) Increasing the temperature (D) None of these

Last Answer : (C) Increasing the temperature

An example of unsteady non uniform flow is the flow of liquid under pressure through a (A) Tapering pipe at constant flow rate (B) Tapering pipe at either decreasing or increasing flow rate (C) Long pipeline of constant diameter (D) None of these

Description : An example of unsteady non uniform flow is the flow of liquid under pressure through a (A) Tapering pipe at constant flow rate (B) Tapering pipe at either decreasing or increasing flow rate (C) Long pipeline of constant diameter (D) None of these

Last Answer : (B) Tapering pipe at either decreasing or increasing flow rate

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? (1) Increasing atmospheric CO 2 concentration up to 0.05% can enhance CO 2 fixation rate (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum (3) Tomato is a greenhouse crop which can be grown in CO 2 - enriched atmosphere for higher yield (4) Light saturation for CO 2 fixation occurs at 10% of full sunlight

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Last Answer : (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum

Flat footed camels can walk easily in sandy deserts because - (1) pressure on the sand is decreased by increasing the area of the surface in contact (2) pressure on the sand is increased by increasing the area of the surface in contact (3) pressure on the sand is decreased by decreasing the area of the surface in contact (4) pressure on the sand is increased by decreasing the area of the surface in contact

Description : Flat footed camels can walk easily in sandy deserts because - (1) pressure on the sand is decreased by increasing the area of the surface in contact (2) pressure on the sand is increased by ... in contact (4) pressure on the sand is increased by decreasing the area of the surface in contact

Last Answer : (1) pressure on the sand is decreased by increasing the area of the surface in contact Explanation: Camels have broad, flat, leathery pads with two toes on each foot. When the camel places its foot on ... the animal on loose sand in much the same way that a snowshoe helps a person walk on snow.

Flat footed camels can walk easily in sandy deserts because (1) pressure on the sand is decreased by increasing the area of the surface in contact (2) pressure on the sand is increased by increasing the area of the surface in contact (3) pressure on the sand is decreased by decreasing the area of the surface in contact (4) pressure on the sand is increased by decreasing the area of the surface in contact

Description : Flat footed camels can walk easily in sandy deserts because (1) pressure on the sand is decreased by increasing the area of the surface in contact (2) pressure on the sand is increased by increasing ... in contact (4) pressure on the sand is increased by decreasing the area of the surface in contact

Last Answer : pressure on the sand is decreased by increasing the area of the surface in contact

Enzymes increase the rates of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Description : Enzymes increase the rates of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Last Answer : Answer : B

Walter’s Model suggests that a firm can always increase the value of the share by: A. Increasing dividend B. Decreasing dividend C. Constant Dividend D. None of the

Description : Walter’s Model suggests that a firm can always increase the value of the share by: A. Increasing dividend B. Decreasing dividend C. Constant Dividend D. None of the

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The shock absorbing capacity of bolts can be increased by a) Increasing the shank diameter b) Decreasing the length of shank portion of bolt c) Increase the shank diameter and decreasing the length of shank d) None of the listed

Description : The shock absorbing capacity of bolts can be increased by a) Increasing the shank diameter b) Decreasing the length of shank portion of bolt c) Increase the shank diameter and decreasing the length of shank d) None of the listed

Last Answer : d) None of the listed

The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream (A) Keeps on increasing (B) Keeps on decreasing (C) Remain constant (D) May increase/decrease

Description : The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream (A) Keeps on increasing (B) Keeps on decreasing (C) Remain constant (D) May increase/decrease

Last Answer : Answer: Option C

An increase in promotional budgets have: a. increasing returns over time. b. level returns over time. c. decreasing returns over time. d. decreasing then increasing returns over time. e. increasing then decreasing returns over time.

Description : An increase in promotional budgets have: a. increasing returns over time. b. level returns over time. c. decreasing returns over time. d. decreasing then increasing returns over time. e. increasing then decreasing returns over time.

Last Answer : c. decreasing returns over time.

The two sides of a tringle are increasing at the rate of 1/2 ft/sec with their included angle decreasing at the rate of π/90 rad/sec. What is the rate of change of area when the sides and the included angle are respectively 5 ft,8 ft, and 60°?

Description : The two sides of a tringle are increasing at the rate of 1/2 ft/sec with their included angle decreasing at the rate of π/90 rad/sec. What is the rate of change of area when the sides and the included angle are respectively 5 ft,8 ft, and 60°?

Last Answer : Area = (L1 L2) sin(angle) , where L1, L2 and and angle are functions of time t. Take the derivative using the multiplication rule. The derivative will equal (L1L2)(derivative of sin) + sin times ... will have to use the multiplication rule a second time to get the derivative of L1 L2. Good luck.

The length of a rectangle is decreasing at a rate of 3 cm/sec and breadth is increasing at a rate of 4 cm/sec. Find the rate of change of its (a) peri

Description : The length of a rectangle is decreasing at a rate of 3 cm/sec and breadth is increasing at a rate of 4 cm/sec. Find the rate of change of its (a) peri

Last Answer : The length of a rectangle is decreasing at a rate of 3 cm/sec and breadth is increasing at a ... breadth of rectangle are 7 cm and 8 cm respectively.

Enzymes increases the rate of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Description : Enzymes increases the rate of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Last Answer : Answer : B

Enzymes accelerate the rate of reactions by (A) Increasing the equilibrium constant of reactions (B) Increasing the energy of activation (C) Decreasing the energy of activation (D) Decreasing the free energy change of the reaction

Description : Enzymes accelerate the rate of reactions by (A) Increasing the equilibrium constant of reactions (B) Increasing the energy of activation (C) Decreasing the energy of activation (D) Decreasing the free energy change of the reaction

Last Answer : Answer : C

The seed rate can be increased by a) Decreasing the exposure length b) Increasing the exposure length c) Increasing speed d) Decreasing speed Ans. b

Description : The seed rate can be increased by a) Decreasing the exposure length b) Increasing the exposure length c) Increasing speed d) Decreasing speed Ans. b

Last Answer : ans b

Adjustment needed when thresher blows grains with chaff a.) Decreasing cylinder peripheral speed. b.) Increasing cylinder speed. c.) Decreasing feed rate. d.) Increasing cylinder

Description : Adjustment needed when thresher blows grains with chaff a.) Decreasing cylinder peripheral speed. b.) Increasing cylinder speed. c.) Decreasing feed rate. d.) Increasing cylinder

Last Answer : a.) Decreasing cylinder peripheral speed.

TVC curve begins to………with the onset of increasing returns (a) Rise at an increasing rate ; (b) Rise at an decreasing rate; (c) Fall at an Increasing rate ; (d) Stabilize

Description : TVC curve begins to………with the onset of increasing returns (a) Rise at an increasing rate ; (b) Rise at an decreasing rate; (c) Fall at an Increasing rate ; (d) Stabilize

Last Answer :  (b) Rise at an decreasing rate;

TVC curve begins to……….with the onset of diminishing returns (a) Rise at an Increasing rate ; (b) Rise at an decreasing rate; (c) Fall at an Increasing rate ; (d) Stabilize

Description : TVC curve begins to……….with the onset of diminishing returns (a) Rise at an Increasing rate ; (b) Rise at an decreasing rate; (c) Fall at an Increasing rate ; (d) Stabilize 

Last Answer : (a) Rise at an Increasing rate ; 

Drying of a solid involves __________ transfer. (A) Only heat (B) Only mass (C) Both heat and mass (D) None of these

Description : Drying of a solid involves __________ transfer. (A) Only heat (B) Only mass (C) Both heat and mass (D) None of these

Last Answer : (C) Both heat and mass

A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by (A) Decreasing the size of the inlet pipe (B) Increasing the size of the inlet pipe (C) Lowering the pump position (D) Both (B) and (C)

Description : A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by (A) Decreasing the size of the inlet pipe (B) Increasing the size of the inlet pipe (C) Lowering the pump position (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures (C) Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness (D) None of these

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Last Answer : (D) None of these

Potential flow is characterised by the (A) Irrotational and frictionless flow(B) Irrotational and frictional flow(C) One in which dissipation of mechanical energy into heat occurs(D) Formation of eddies within the stream

Description : Potential flow is characterised by the (A) Irrotational and frictionless flow (B) Irrotational and frictional flow (C) One in which dissipation of mechanical energy into heat occurs (D) Formation of eddies within the stream

Last Answer : (A) Irrotational and frictionless flow

A health disorder that results from the deficiency of thyroxine in adults and characterised by (i) a low metabolic rate, (ii) increase in body weight and (iii) tendency to retain water in tissues is (a) simple goitre (b) myxoedema (c) cretinism (d) hypothyroidism.

Description : A health disorder that results from the deficiency of thyroxine in adults and characterised by (i) a low metabolic rate, (ii) increase in body weight and (iii) tendency to retain water in tissues is (a) simple goitre (b) myxoedema (c) cretinism (d) hypothyroidism.

Last Answer : (b) myxoedema

Which of the following factors increases the tendency of knocking in the CI engines? (a) Increasing both the r and coolant temperatures (b) Increasing both the speed and the injection advance (c) Increasing the speed, injection advance and coolant temperature (d) Increasing the compression ratio

Description : Which of the following factors increases the tendency of knocking in the CI engines? (a) Increasing both the r and coolant temperatures (b) Increasing both the speed and the injection advance (c) Increasing the speed, injection advance and coolant temperature (d) Increasing the compression ratio

Last Answer : Ans :c