For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary (A) Directly as square of gas density (B) Directly as gas density (C) Directly as square root of gas density (D) Inversely as gas density

For a specific centrifugal air blower operating at constant speed &
capacity, the power requirement and pressure vary
(A) Directly as square of gas density
(B) Directly as gas density
(C) Directly as square root of gas density
(D) Inversely as gas density
by

1 Answer

Answer :

(B) Directly as gas density
by

Related questions

. The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density. (A) Directly as (B) Inversely as square root of (C) Inversely as (D) As square of

Description : . The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density. (A) Directly as (B) Inversely as square root of (C) Inversely as (D) As square of

Last Answer : (A) Directly as

With a constant diameter impeller of a centrifugal pump (A) Its capacity varies directly as the square of speed (B) Head varies as the square of speed (C) Horsepower input varies as the square of speed (D) Head varies as the speed

Description : With a constant diameter impeller of a centrifugal pump (A) Its capacity varies directly as the square of speed (B) Head varies as the square of speed (C) Horsepower input varies as the square of speed (D) Head varies as the speed

Last Answer : (B) Head varies as the square of speed

At a constant speed of the centrifugal pump, it’s __________ the impeller diameter. (A) Capacity varies directly with (B) Head varies as the square of (C) Horsepower varies as the cube of (D) All (A), (B) and (C)

Description : At a constant speed of the centrifugal pump, it’s __________ the impeller diameter. (A) Capacity varies directly with (B) Head varies as the square of (C) Horsepower varies as the cube of (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

In case of centrifugal fan or blower, the gas capacity varies as (A) Speed (B) (Speed) 2 (C) (Speed) 3 (D) (Speed) 0.5

Description : In case of centrifugal fan or blower, the gas capacity varies as (A) Speed (B) (Speed) 2 (C) (Speed) 3 (D) (Speed) 0.5

Last Answer : (A) Speed

Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases. (A) NPSH required (B) BHP required by the pump (C) Head of the liquid pumped (D) All (A), (B) and (C)

Description : Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases. (A) ... the pump (C) Head of the liquid pumped (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The velocity of sound is ….. the density of the medium. (a) Directly proportional to (b) Inversely proportional to (c) Directly proportional to the square root of (d) Inversely proportional to the square root of

Description : The velocity of sound is ….. the density of the medium. (a) Directly proportional to (b) Inversely proportional to (c) Directly proportional to the square root of (d) Inversely proportional to the square root of

Last Answer : Ans:(d)

Boyle's law states that A. pressure of a gas is inversely proportional to its volume i.e. P × V = constant B. pressure of a gas is directly proportional to its volume i.e. P⁄V = constant C. pressure of a gas is inversely proportional to the square of its volume i.e. P × V² = constant D. pressure of a gas is directly proportional to the square of its volume i.e. P ⁄ V² = constant

Description : Boyle's law states that A. pressure of a gas is inversely proportional to its volume i.e. P V = constant B. pressure of a gas is directly proportional to its volume i.e. P⁄V = constant C. ... of a gas is directly proportional to the square of its volume i.e. P ⁄ V² = constant

Last Answer : pressure of a gas is inversely proportional to its volume i.e. P × V = constant

Power requirement of fans having constant wheel diameter varies __________ fan speed. (A) As square of (B) Directly as (C) As cube of (D) None of these

Description : Power requirement of fans having constant wheel diameter varies __________ fan speed. (A) As square of (B) Directly as (C) As cube of (D) None of these

Last Answer : (C) As cube of

How does the electric field strength of a standard broadcast station vary with the distance from the antenna? A. The field strength of a standard broadcast station vary with the distance from the antenna B. The field strength is directly proportional to the distance from the antenna C. The field strength remains constant regardless of the distance from the antenna D. The field strength varies inversely as the distance from the antenna

Description : How does the electric field strength of a standard broadcast station vary with the distance from the antenna? A. The field strength of a standard broadcast station vary with the distance from ... the distance from the antenna D. The field strength varies inversely as the distance from the antenna

Last Answer : D. The field strength varies inversely as the distance from the antenna

The main drawback of supplying more excess air in the combustion of fuel is the (A) Excessive power requirement of air blower (B) Enhanced sensible heat loss in the flue gas (C) Intermittent and uncontrolled combustion of the fuel (D) High exit flue gas temperature from the furnace

Description : The main drawback of supplying more excess air in the combustion of fuel is the (A) Excessive power requirement of air blower (B) Enhanced sensible heat loss in the flue gas (C) Intermittent and uncontrolled combustion of the fuel (D) High exit flue gas temperature from the furnace

Last Answer : (B) Enhanced sensible heat loss in the flue gas

In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the (A) Square root of the velocity (B) Square of the viscosity (C) Filtration time only (D) Washing time only

Description : In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the (A) Square root of the velocity (B) Square of the viscosity (C) Filtration time only (D) Washing time only

Last Answer : (A) Square root of the velocity

In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity. (A) Directly proportional to (B) Inversely proportional to (C) Inversely proportional to the square root of (D) Independent of

Description : In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity. (A) Directly proportional to (B) Inversely proportional to (C) Inversely proportional to the square root of (D) Independent of

Last Answer : (B) Inversely proportional to

A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is (A) ½w 2 . R 2 . ρL (B) ½w 2 . δ 2 . ρL (C) ½w 2 . δρL (2R + δ) (D) ½w 2 . R . ρL(R + 2δ)

Description : A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The ... . ρL (C) ½w 2 . δρL (2R + δ) (D) ½w 2 . R . ρL(R + 2δ)

Last Answer : (C) ½w 2 . δρL (2R + δ)

The load shared by each spring is inversely proportional to the cross section of wire. a) Yes b) No, it is directly proportional c) It is proportional to its square d) It is proportional to its square root

Description : The load shared by each spring is inversely proportional to the cross section of wire. a) Yes b) No, it is directly proportional c) It is proportional to its square d) It is proportional to its square root

Last Answer : b) No, it is directly proportional

The Reynold's number of a ship is __________ to its velocity and length. (A) Directly proportional (B) Inversely proportional (C) Square root of velocity (D) None of these

Description : The Reynold's number of a ship is __________ to its velocity and length. (A) Directly proportional (B) Inversely proportional (C) Square root of velocity (D) None of these

Last Answer : Answer: Option A

According to IS: 4561978, the flexural strength of concrete is (A) Directly proportional to compressive strength (B) Inversely proportional to compressive strength (C) Directly proportional to square root of compressive strength (D) Inversely proportional to square root of compressive strength

Description : According to IS: 4561978, the flexural strength of concrete is (A) Directly proportional to compressive strength (B) Inversely proportional to compressive strength (C) Directly proportional to square root of compressive strength (D) Inversely proportional to square root of compressive strength

Last Answer : Answer: Option C

The wavelength of the wave associated with the moving object is a) Directly proportional to the accelerating voltage b) Directly proportional to the square of accelerating voltage c) Inversely proportional to the square root of accelerating voltage d) Inversely proportional to the accelerating voltage

Description : The wavelength of the wave associated with the moving object is a) Directly proportional to the accelerating voltage b) Directly proportional to the square of accelerating voltage c) ... proportional to the square root of accelerating voltage d) Inversely proportional to the accelerating voltage

Last Answer : c) Inversely proportional to the square root of accelerating voltage

The Radius (or diameter) of bright rings in Newton’s rings is (a) Directly proportional to the square root of odd numbers (b) Inversely proportional to the square root of natural numbers (c) Directly proportional to the square root of even numbers (d) Directly proportional to the square root of natural numbers

Description : he Radius (or diameter) of bright rings in Newton's rings is (a) Directly proportional to the square root of odd numbers (b) Inversely proportional to the square root of natural numbers (c) ... to the square root of even numbers (d) Directly proportional to the square root of natural numbers

Last Answer : (a) Directly proportional to the square root of odd numbers

According to Bernoulli's equation for steady ideal fluid flow (A) Principle of conservation of mass holds (B) Velocity and pressure are inversely proportional (C) Total energy is constant throughout (D) The energy is constant along a streamline but may vary across streamlines

Description : According to Bernoulli's equation for steady ideal fluid flow (A) Principle of conservation of mass holds (B) Velocity and pressure are inversely proportional (C) Total energy is constant throughout (D) The energy is constant along a streamline but may vary across streamlines

Last Answer : Answer: Option D

Assuming uniform density of the core, the acceleration due to gravity below the Earth's surface is A. inversely proportional to the square of the distance from the center of the Earth B. inversely proportional to the distance from the center of the Earth C. directly proportional to the square of the distance from the center of the Earth D. directly proportional to the distance from the center of the Earth

Description : Assuming uniform density of the core, the acceleration due to gravity below the Earth's surface is A. inversely proportional to the square of the distance from the center of the Earth ... center of the Earth D. directly proportional to the distance from the center of the Earth

Last Answer : directly proportional to the distance from the center of the Earth

Which of the following can be used to create a flow of gas, where no significant compression is required? (A) Reciprocating compressor (B) Blower (C) Axial flow compressor (D) Centrifugal compressor

Description : Which of the following can be used to create a flow of gas, where no significant compression is required? (A) Reciprocating compressor (B) Blower (C) Axial flow compressor (D) Centrifugal compressor

Last Answer : (B) Blower

Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is (A) Inversely proportional to viscosity of gas (B) Proportional to the viscosity & density of the gas (C) Proportional to the pressure of the gas (D) Both (B) and (C)

Description : Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is (A) Inversely proportional to ... the gas (C) Proportional to the pressure of the gas (D) Both (B) and (C)

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

The strain energy due to volumetric strain (A) Is directly proportional to the volume (B) Is directly proportional to the square of exerted pressure (C) Is inversely proportional to Bulk modulus (D) All the above

Description : The strain energy due to volumetric strain  (A) Is directly proportional to the volume  (B) Is directly proportional to the square of exerted pressure  (C) Is inversely proportional to Bulk modulus  (D) All the above 

Last Answer : (D) All the above 

The pressure of fluid due to hammer blow is (A) Directly proportional to density of fluid (B) Inversely proportional to density of fluid (C) Directly proportional to (density)1/2 of fluid (D) Inversely proportional to (density)1/2 of fluid

Description : The pressure of fluid due to hammer blow is (A) Directly proportional to density of fluid (B) Inversely proportional to density of fluid (C) Directly proportional to (density)1/2 of fluid (D) Inversely proportional to (density)1/2 of fluid

Last Answer : Answer: Option C

According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.  A. equal to  B. directly proportional to  C. inversely proportional to

Description : According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.  A. equal to  B. directly proportional to  C. inversely proportional to

Last Answer : Answer: B

The rated life of a bearing varies A. Directly as load B. Inversely as square of load C. Inversely as cube of load D. Inversely as fourth power of load

Description : The rated life of a bearing varies A. Directly as load B. Inversely as square of load C. Inversely as cube of load D. Inversely as fourth power of load

Last Answer : C. Inversely as cube of load

The rated life of a bearing varies (A) Directly as load (B) Inversely as square of load (C) Inversely as cube of load (D) Inversely as fourth power of load

Description : The rated life of a bearing varies (A) Directly as load (B) Inversely as square of load (C) Inversely as cube of load (D) Inversely as fourth power of load

Last Answer : (C) Inversely as cube of load

Critical compressibility factor for all substances (A) Are more or less constant (vary from 0.2 to 0.3) (B) Vary as square of the absolute temperature (C) Vary as square of the absolute pressure (D) None of these

Description : Critical compressibility factor for all substances (A) Are more or less constant (vary from 0.2 to 0.3) (B) Vary as square of the absolute temperature (C) Vary as square of the absolute pressure (D) None of these

Last Answer : (A) Are more or less constant (vary from 0.2 to 0.3)

Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to the force of friction C. The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure D. The coefficient of friction is inversely proportional to the force pressing the surfaces together

Description : Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to ... D. The coefficient of friction is inversely proportional to the force pressing the surfaces together

Last Answer : The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure

In case of a __________ the energy of flow is considerably decreased downstream of the machine. (A) Blower (B) Turbine (C) Centrifugal pump (D) Centrifugal fan

Description : In case of a __________ the energy of flow is considerably decreased downstream of the machine. (A) Blower (B) Turbine (C) Centrifugal pump (D) Centrifugal fan

Last Answer : (B) Turbine

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid (A) Varies directly as the area and the LMTD (B) Directly proportional to LMTD and inversely proportional to the area (C) Varies as square of the area (D) None of these

Description : In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid (A) Varies directly as the area and the LMTD (B) Directly proportional to LMTD and inversely proportional to the area (C) Varies as square of the area (D) None of these

Last Answer : (A) Varies directly as the area and the LMTD

The head loss in turbulent flow in a pipe varies (A) Directly as the velocity (B) Inversely as the square of the velocity (C) Approximately as the square of the velocity (D) Inversely as the square of the diameter

Description : The head loss in turbulent flow in a pipe varies (A) Directly as the velocity (B) Inversely as the square of the velocity (C) Approximately as the square of the velocity (D) Inversely as the square of the diameter

Last Answer : (C) Approximately as the square of the velocity

The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is ___________ the mean velocity of flow. (A) Directly proportional to (B) Directly proportional to square of (C) Inversely proportional to (D) Inversely proportional to square of

Description : The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is ___________ the mean velocity of flow. (A) Directly proportional to (B) Directly proportional to square of (C) Inversely proportional to (D) Inversely proportional to square of

Last Answer : (B) Directly proportional to square of

At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants. (A) Independent of (B) Directly proportional to (C) Inversely proportional to (D) Proportional to the square of

Description : At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants. (A) Independent of (B) Directly proportional to (C) Inversely proportional to (D) Proportional to the square of

Last Answer : (A) Independent of

For an ideal gas, the activity co-efficient is (A) Directly proportional to pressure (B) Inversely proportional to pressure (C) Unity at all pressures (D) None of these

Description : For an ideal gas, the activity co-efficient is (A) Directly proportional to pressure (B) Inversely proportional to pressure (C) Unity at all pressures (D) None of these

Last Answer : (C) Unity at all pressures

Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be (A) More (B) Less (C) Same (D) Either more or less; depends on the climatic conditions

Description : Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be (A) More (B) Less (C) Same (D) Either more or less; depends on the climatic conditions

Last Answer : (B) Less

The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann’s constant, T = absolute temperature) (A) √(2KT/m) (B) √(3KT/m) (C) √(6KT/m) (D) 3KT/m

Description : The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann’s constant, T = absolute temperature) (A) √(2KT/m) (B) √(3KT/m) (C) √(6KT/m) (D) 3KT/m

Last Answer : (B) √(3KT/m)

If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the (A) Linear speed of the basket is doubled (B) Linear speed of the basket is halved (C) Centrifugal force is doubled (D) Capacity of centrifuge is increased

Description : If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the (A) Linear speed of the basket is doubled (B) Linear speed of the basket is halved (C) Centrifugal force is doubled (D) Capacity of centrifuge is increased

Last Answer : (C) Centrifugal force is doubled

What is the best centrifugal blower brand?

Description : What is the best centrifugal blower brand?

Last Answer : Bosh is hands down the best on the market, Plus they wont cost you an arm and a leg.

What is called as the heart of the Lamont boiler? a. Water drum b. Centrifugal pump c. Furnace d. Blower

Description : What is called as the heart of the Lamont boiler? a. Water drum b. Centrifugal pump c. Furnace d. Blower

Last Answer : b. Centrifugal pump

The periodic time of a body moving in Simple Harmonic Motion is a.Directly proportional to its angular velocity b.Directly proportional to the weight of the body c.Inversely proportional to the square of angular velocity d.Directly proportional to the momentum of swinging body e.Inversely proportional to the angular velocity

Description : The periodic time of a body moving in Simple Harmonic Motion is a.Directly proportional to its angular velocity b.Directly proportional to the weight of the body c.Inversely proportional to ... d.Directly proportional to the momentum of swinging body e.Inversely proportional to the angular velocity

Last Answer : e. Inversely proportional to the angular velocity

Let the only force acting on two bodies be their mutual interactions. If both bodies start from rest, the distances travelled by each will be a a.proportional to the respective masses of the bodies b.107 dynes c.inversely proportional to the respective masses of the bodies d.directly proportional to the square of the respective masses of the bodies e.inversely proportional to the square of the respective masses of the bodies

Description : Let the only force acting on two bodies be their mutual interactions. If both bodies start from rest, the distances travelled by each will be a a.proportional to the respective masses of the ... masses of the bodies e.inversely proportional to the square of the respective masses of the bodies

Last Answer : c. inversely proportional to the respective masses of the bodies

The frequency of vibration of a stretched string is _______ its length. (a) Directly proportional to (b) Inversely proportional to (c) Directly proportional to the square of (d) Independent of

Description : The frequency of vibration of a stretched string is _______ its length. (a) Directly proportional to (b) Inversely proportional to (c) Directly proportional to the square of (d) Independent of

Last Answer : Ans:(b)

The rated life of a bearing varies (a) directly as load (b) inversely as the square of the load (c) inversely as the cube of the load

Description : The rated life of a bearing varies (a) directly as load (b) inversely as the square of the load (c) inversely as the cube of the load

Last Answer : (c) inversely as the cube of the load

According to Newton's law of universal gravitation, any two particles of finite mass attract one another with a force which is A. Inversely proportional to the product of their masses and directly proportional to the square of their distance apart B. Inversely proportional to the product of their masses and directly proportional to their distance apart C. Directly proportional to the product of their masses and inversely proportional to their distance apart D. Directly proportional to the product of their masses and inversely proportional to the square of their distance apart

Description : According to Newton's law of universal gravitation, any two particles of finite mass attract one another with a force which is A. Inversely proportional to the product of their masses and ... the product of their masses and inversely proportional to the square of their distance apart

Last Answer : Directly proportional to the product of their masses and inversely proportional to the square of their distance apart

Degree of consolidation is (A) Directly proportional to time and inversely proportional to drainage path (B) Directly proportional to time and inversely proportional to square of drainage path (C) Directly proportional to drainage path and inversely proportional to time (D) Directly proportional to square of drainage path and inversely proportional to time

Description : Degree of consolidation is (A) Directly proportional to time and inversely proportional to drainage path (B) Directly proportional to time and inversely proportional to square of drainage path (C ... to time (D) Directly proportional to square of drainage path and inversely proportional to time

Last Answer : Answer: Option B

The coherence length over which there is a strong relationship between amplitudes is; (A) Directly proportional to the bandwidth (B) Inversely proportional to the bandwidth (C) The square of the bandwidth (D) None of these

Description : The coherence length over which there is a strong relationship between amplitudes is; (A) Directly proportional to the bandwidth (B) Inversely proportional to the bandwidth (C) The square of the bandwidth (D) None of these

Last Answer : Answer: Option B

Permeability of soil varies a) Inversely as square of grain size b) Inversely as grain size c) Directly as grain size d) Square of grain size*

Description : Permeability of soil varies a) Inversely as square of grain size b) Inversely as grain size c) Directly as grain size d) Square of grain size*

Last Answer : d) Square of grain size*

The gravitational potential energy of an object close to the ground varies: w) inversely as its distance from the ground x) directly as its distance from the ground y) inversely as the square of its distance from the ground z) directly as the square of its distance from the ground

Description : The gravitational potential energy of an object close to the ground varies: w) inversely as its distance from the ground x) directly as its distance from the ground y) inversely as the square of its distance from the ground z) directly as the square of its distance from the ground 

Last Answer : ANSWER: X -- DIRECTLY AS ITS DISTANCE FROM THE GROUND