A centrifugal pump used to pump water is used to pump an oil withspecific gravity of 0.8 at the same rate. The power consumption will now (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict

A centrifugal pump used to pump water is used to pump an oil withspecific gravity of 0.8 at the same rate. The power consumption will now
(A) Increase
(B) Decrease
(C) Remain same
(D) Data insufficient to predict
by

1 Answer

Answer :

(B) Decrease
by

Related questions

Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict pressure drop

Description : Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict pressure drop

Last Answer : (A) Increase

Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will (A) Increase (B) Decrease (C) Remain unchanged (D) Data insufficient to predict relative pressure drop

Description : Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the ... (A) Increase (B) Decrease (C) Remain unchanged (D) Data insufficient to predict relative pressure drop

Last Answer : (B) Decrease

If the discharge of a centrifugal pump is throttled, then its suction lift (A) Increases (B) Decreases (C) Remains unchanged (D) Data insufficient to predict

Description : If the discharge of a centrifugal pump is throttled, then its suction lift (A) Increases (B) Decreases (C) Remains unchanged (D) Data insufficient to predict

Last Answer : (A) Increases

. For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient, can't be predicted

Description : . For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient, can't be predicted

Last Answer : (A) Increase

With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will (A) Increase (B) Decrease (C) Remain same (D) Data in insufficient; can't be predicted

Description : With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will (A) Increase (B) Decrease (C) Remain same (D) Data in insufficient; can't be predicted

Last Answer : (A) Increase

A pitched-blade turbine draws __________ a straight blade turbine. (A) Less power than (B) More power than (C) Same power as (D) Data insufficient to predict

Description : A pitched-blade turbine draws __________ a straight blade turbine. (A) Less power than (B) More power than (C) Same power as (D) Data insufficient to predict

Last Answer : (A) Less power than

With increase in molecular weight of the gas, the head developed by a centrifugal compressor will (A) Decrease (B) Increase (C) Remain same (D) Unpredictable

Description : With increase in molecular weight of the gas, the head developed by a centrifugal compressor will (A) Decrease (B) Increase (C) Remain same (D) Unpredictable

Last Answer : (A) Decrease

The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be (A) More (B) Less (C) Same (D) Data insufficient to predict

Description : The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be (A) More (B) Less (C) Same (D) Data insufficient to predict

Last Answer : (A) More

A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be __________ hp. (A) 0.5 (B) 2 (C) 4 (D) 1

Description : A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be __________ hp. (A) 0.5 (B) 2 (C) 4 (D) 1

Last Answer : (A) 0.5

. If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will (A) Increase by 1.8 times (B) Decrease by 2 2 (C) Increase by 2 16 (D) Remain unchanged

Description : . If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will (A) Increase by 1.8 times (B) Decrease by 2 2 (C) Increase by 2 16 (D) Remain unchanged

Last Answer : (C) Increase by 2 16

A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump (A) Develops a lower head (B) Capacity is reduced (C) Requires more power (D) All (A), (B) and (C)

Description : A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump (A) Develops a lower head (B) Capacity is reduced (C) Requires more power (D) All (A), (B) and (C)

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

Priming of a centrifugal pump is done to (A) Increase the mass flow rate of fluid (B) Develop effective pressure rise by the pump (C) Avoid chances of separation inside the impeller (D) None of these

Description : Priming of a centrifugal pump is done to (A) Increase the mass flow rate of fluid (B) Develop effective pressure rise by the pump (C) Avoid chances of separation inside the impeller (D) None of these

Last Answer : (C) Avoid chances of separation inside the impeller

Which of the following is not the function of a volute casing provided in a centrifugal pump? (A) To reduce the head loss in discharge (B) To increase the pump efficiency (C) To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity (D) To increase the pump discharge rate

Description : Which of the following is not the function of a volute casing provided in a centrifugal pump? (A) To reduce the head loss in discharge (B) To increase the pump efficiency (C) To collect liquid ... and to transmit it to the delivery pipe at constant velocity (D) To increase the pump discharge rate

Last Answer : Option D

Both stearic acid and linoleic acid have 18 carbons. Linoleic acid is unsaturated, while stearic acid is saturated. The melting point of stearic acid : (a) is higher than linoleic acid (b) is lower than linoleic acid (c) is same as linoleic acid (d) can not predict, insufficient information

Description : Both stearic acid and linoleic acid have 18 carbons. Linoleic acid is unsaturated, while stearic acid is saturated. The melting point of stearic acid : (a) is higher than linoleic acid (b) is lower than linoleic acid (c) is same as linoleic acid (d) can not predict, insufficient information

Last Answer : is higher than linoleic acid

One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to (A) Heat the water from 0°C to 100°C (B) Evaporate the water (C) To superheat the steam (D) Data insufficient, can't be predicted

Description : One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to (A) Heat the water from 0°C to 100°C (B) Evaporate the water (C) To superheat the steam (D) Data insufficient, can't be predicted

Last Answer : (B) Evaporate the water

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)

As the time is passing, entropy of the universe (A) Is increasing (B) Is decreasing (C) Remain constant (D) Data insufficient, can't be predicted

Description : As the time is passing, entropy of the universe (A) Is increasing (B) Is decreasing (C) Remain constant (D) Data insufficient, can't be predicted

Last Answer : (A) Is increasing

If the head is doubled in & centrifugal pump, the power required will increase in the ratio of (A) 23 (B) 23/2 (C) 25/2 (D) 21/3

Description : If the head is doubled in & centrifugal pump, the power required will increase in the ratio of (A) 23 (B) 23/2 (C) 25/2 (D) 21/3

Last Answer : B) 23/2

Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure. (A) Increase (B) Decrease (C) Not change (D) Exponentially decrease

Description : Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure. (A) Increase (B) Decrease (C) Not change (D) Exponentially decrease

Last Answer : (A) Increase

An oil fired boiler is retrofitted to fire coconut shell chips. Boiler thermal efficiency drops from 82% to 70%. What will be the percentage change in energy consumption to generate the same output a) 12% increase b) 14.6% increase c) 17.1% decrease d) 17.1% increase

Description : An oil fired boiler is retrofitted to fire coconut shell chips. Boiler thermal efficiency drops from 82% to 70%. What will be the percentage change in energy consumption to generate the same output a) 12% increase b) 14.6% increase c) 17.1% decrease d) 17.1% increase

Last Answer : d) 17.1% increase

With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease; depends on the magnitude of shear rate

Description : With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease; depends on the magnitude of shear rate

Last Answer : (B) Decreases

As the chemical reaction proceeds, the rate of reaction(A) Increases (B) Decreases (C) Remain same (D) May increase or decrease depending on the type of reaction

Description : As the chemical reaction proceeds, the rate of reaction (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease depending on the type of reaction

Last Answer : (B) Decreases

A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp). (A) Less head & capacity (B) More head (C) More capacity (D) Less head & more capacity

Description : A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp). (A) Less head & capacity (B) More head (C) More capacity (D) Less head & more capacity

Last Answer : (A) Less head & capacity

Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft. (A) 40 (B) 34 (C) 8 (D) 37

Description : Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft. (A) 40 (B) 34 (C) 8 (D) 37

Last Answer : (C) 8

Crude oil is pumped by a __________ pump. (A) Gear (B) Centrifugal

Description : Crude oil is pumped by a __________ pump. (A) Gear (B) Centrifugal

Last Answer : (B) Centrifugal

Medium viscosity lubricating oil can be most ideally pumped by a __________ pump. (A) Vane (B) Piston (C) Centrifugal (D) Plunger

Description : Medium viscosity lubricating oil can be most ideally pumped by a __________ pump. (A) Vane (B) Piston (C) Centrifugal (D) Plunger

Last Answer : (A) Vane

Which of the following is used for pumping crude oil from oil well? (A) Single stage centrifugal pump (B) Gear pump (C) Screw pump (D) Duplex/triplex reciprocating pump

Description : Which of the following is used for pumping crude oil from oil well? (A) Single stage centrifugal pump (B) Gear pump (C) Screw pump (D) Duplex/triplex reciprocating pump

Last Answer : (D) Duplex/triplex reciprocating pump

Centrifugal pump can't be used to pump (A) Molten sodium (used as a coolant in Fast Breeder Reactor) (B) Moderately viscous vegetable oil used in soap industry (C) Thick molten soap at 80°C (D) None of the above

Description : Centrifugal pump can't be used to pump (A) Molten sodium (used as a coolant in Fast Breeder Reactor) (B) Moderately viscous vegetable oil used in soap industry (C) Thick molten soap at 80°C (D) None of the above

Last Answer : (C) Thick molten soap at 80°C

A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be __________ metres. (A) 2 (B) 4 (C) 8 (D) 5.5

Description : A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be __________ metres. (A) 2 (B) 4 (C) 8 (D) 5.5

Last Answer : (A) 2

A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the new discharge will be __________ litres/minute. (A) 500 (B) 200 (C) 1000 (D) 750

Description : A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the new discharge will be __________ litres/minute. (A) 500 (B) 200 (C) 1000 (D) 750

Last Answer : (A) 500

Violent gassing developed by a lead-acid battery during charging indicates that the ____________. A. plate separators are grounded B. cell voltages are excessive C. specific gravity in insufficient D. charging rate is excessive

Description : Violent gassing developed by a lead-acid battery during charging indicates that the ____________. A. plate separators are grounded B. cell voltages are excessive C. specific gravity in insufficient D. charging rate is excessive

Last Answer : Answer: D

If airbrakes are extended during a glide, and speed maintained, the rate of descent will: a. Increase and glide angle will be steeper b. Increase but glide angle will remain the same c. Decrease d. Remain the same

Description : If airbrakes are extended during a glide, and speed maintained, the rate of descent will: a. Increase and glide angle will be steeper b. Increase but glide angle will remain the same c. Decrease d. Remain the same

Last Answer : a. Increase and glide angle will be steeper

Volute type of casing is provided in a centrifugal pump to (A) Convert velocity head to pressure head (B) Convert pressure head to velocity head (C) Reduce the discharge fluctuation (D) Increase the discharge

Description : Volute type of casing is provided in a centrifugal pump to (A) Convert velocity head to pressure head (B) Convert pressure head to velocity head (C) Reduce the discharge fluctuation (D) Increase the discharge

Last Answer : (D) Increase the discharge

At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower. (A) Is greater than (B) Is lower than (C) Is same as (D) Cannot be predicted as data are insufficient

Description : At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower. (A) Is greater than (B) Is lower than (C) Is same as (D) Cannot be predicted as data are insufficient

Last Answer : (A) Is greater than

With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be (A) Higher in P.F. reactor (B) Higher in CSTR (C) Same in both the reactors (D) Data insufficient; can't be predicted

Description : With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be (A) Higher in P.F. reactor (B) Higher in CSTR (C) Same in both the reactors (D) Data insufficient; can't be predicted

Last Answer : (A) Higher in P.F. reactor

The filtrate flow rate in constant pressure filtration (A) Continuously increases (B) Continuously decreases (C) Remain constant throughout (D) May increase or decrease; depends on the pressure

Description : The filtrate flow rate in constant pressure filtration (A) Continuously increases (B) Continuously decreases (C) Remain constant throughout (D) May increase or decrease; depends on the pressure

Last Answer : (B) Continuously decreases

In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will (A) Increase (B) Decrease (C) Remain unchanged (D) Either increase or decrease; depends on the coolant flow rate

Description : In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation ... Decrease (C) Remain unchanged (D) Either increase or decrease; depends on the coolant flow rate

Last Answer : (C) Remain unchanged

With increasing flow rate, the hydraulic efficiency of a centrifugal pump (A) Monotonically decreases (B) Decreases and then increases(C) Remains constant(D) Increases and then decreases

Description : With increasing flow rate, the hydraulic efficiency of a centrifugal pump (A) Monotonically decreases (B) Decreases and then increases (C) Remains constant (D) Increases and then decreases

Last Answer : (A) Monotonically decreases

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)

Delivery of insufficient quantity of liquid by a pump may be caused by (A) Air leak in the inlet (B) Low rpm (C) Too high a lift (D) All (A), (B) and (C)

Description : Delivery of insufficient quantity of liquid by a pump may be caused by (A) Air leak in the inlet (B) Low rpm (C) Too high a lift (D) All (A), (B) and (C)

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

If a piece of metal at -20 degrees Celsius is added to an ice and water mixture in equilibrium at 0 degrees Celsius, the amount of ice will: w) Increase x) Remain the same y) Decrease

Description : If a piece of metal at -20 degrees Celsius is added to an ice and water mixture in equilibrium at 0 degrees Celsius, the amount of ice will: w) Increase x) Remain the same y) Decrease

Last Answer : ANSWER: W -- INCREASE

The maximum depth from which a centrifugal pump can draw water is (A) Dependent on the speed of the pump (B) Dependent on the power of the pump (C) 34 feet (D) 150 feet

Description : The maximum depth from which a centrifugal pump can draw water is (A) Dependent on the speed of the pump (B) Dependent on the power of the pump (C) 34 feet (D) 150 feet

Last Answer : (C) 34 feet

The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec. (A) 1.8 (B) 12.4 (C) 186.2 (D) 736.4

Description : The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec. (A) 1.8 (B) 12.4 (C) 186.2 (D) 736.4

Last Answer : (B) 12.4

Newton’s rings experiment is performed with air gap between lens and plate. Now that gap is filled with water. What will be effect on radius (or diameter)? (a) Radius (or diameter) will remain constant but there will be more brightness (b) Radius (or diameter) will increase (c) Radius (or diameter) will decrease (d) There will be no effect

Description : Newton's rings experiment is performed with air gap between lens and plate. Now that gap is filled with water. What will be effect on radius (or diameter)? (a) Radius (or diameter) will remain ... or diameter) will increase (c) Radius (or diameter) will decrease (d) There will be no effect

Last Answer : (c) Radius (or diameter) will decrease

Power loss in an orificemeter is __________ that in a Venturimeter. (A) Less than (B) Same as (C) More than (D) Data insufficient, cannot be predicted

Description : Power loss in an orificemeter is __________ that in a Venturimeter. (A) Less than (B) Same as (C) More than (D) Data insufficient, cannot be predicted

Last Answer : (C) More than

As the temperature of the air increases from 0 degrees C to 20 degrees C, the wavelength of a sound made by a tuning fork of fixed frequency does which of the following? Does the wavelength w) increase x) decrease y) remain the same z) increase up to a maximum, then remain constant

Description : As the temperature of the air increases from 0 degrees C to 20 degrees C, the wavelength of a sound made by a tuning fork of fixed frequency does which of the following? Does the wavelength w) increase x) decrease y) remain the same z) increase up to a maximum, then remain constant

Last Answer : ANSWER: W -- INCREASE

The head developed by a centrifugal pump is largely determined by the (A) Power of the pump(B) Nature of the liquid being pumped(C) Angle of the vanes and the speed of the tip of the impeller(D) Vapour pressure of the liquid

Description : The head developed by a centrifugal pump is largely determined by the (A) Power of the pump (B) Nature of the liquid being pumped (C) Angle of the vanes and the speed of the tip of the impeller (D) Vapour pressure of the liquid

Last Answer : (C) Angle of the vanes and the speed of the tip of the impeller

Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) (A) N2D3 (B) ND2 (C) N2D (D) N3D5

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Last Answer : (D) N3D5

In β-decay of radioactive material, the ratio of neutron to proton (A) Increases (B) Remain same (C) Decreases (D) Is unpredictable; may increase or decrease

Description : In β-decay of radioactive material, the ratio of neutron to proton (A) Increases (B) Remain same (C) Decreases (D) Is unpredictable; may increase or decrease

Last Answer : (C) Decreases

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Description : With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease; depends on system

Last Answer : (B) Decreases