For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and

For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjustable vanes is 

(A) Kaplan (B) Francis (C) Pelton (D) Impeller
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1 Answer

Answer :

For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjustable vanes is Kaplan 

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Related questions

A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to

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Last Answer : A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the number of poles required in the generator are 24

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Description : Reciprocating pumps  (A) Are not suitable for variable heads  (B) Are four times costlier than centrifugal pumps  (C) Are not suitable for pumping water containing sediments  (D) Single stroke produce pulsating flow 

Last Answer : (A) Are not suitable for variable heads 

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The pump impeller and the turbine runner in a hydraulic torque converter (A) Have the same diameter (B) Have different diameters (C) Are directly coupled (D) None of these

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Last Answer : ANS: D

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Last Answer : 2

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Description : Explain the working principle of the following dynamometers with suitable sketches, if necessary: (i) Hydraulic Dynamometer. (ii) Eddy Current Dynamometer.

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Show the difference between hydraulic gradient line & total energy line with the help of suitable diagram.

Description : Show the difference between hydraulic gradient line & total energy line with the help of suitable diagram.

Last Answer : Show the difference between hydraulic gradient line & total energy line with the help of suitable diagram.

For high head and low discharge, the water turbine used is

Description : For high head and low discharge, the water turbine used is

Last Answer : For high head and low discharge, the water turbine used is Pelton wheel

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Last Answer : e) all of the above*

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Last Answer : Answer: B

Which material is used in controlling chain reaction in a nuclear reactor?

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Explain reaction turbine in terms of head:

Description : Explain reaction turbine in terms of head:

Last Answer : High head- Francis Medium head- Propeller Low head- Kaplan

Explain the main difference between impulse and reaction turbine.

Description : Explain the main difference between impulse and reaction turbine. 

Last Answer : When the inlet pressure of steam to the turbine is equal to outlet pressure of steam from the turbine the turbine is called the impulse turbine. In this type the heat is added is very less. ... than the inlet pressure of the steam. There is reduction in pressure with the increase in kinetic energy.

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Description : The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be (A) 0.4 (B) 0.56 (C) 0.67 (D) 1.67

Last Answer : (A) 0.4

With neat sketch describe working of reaction turbine.

Description : With neat sketch describe working of reaction turbine.

Last Answer : Working principle of reaction turbine- -A turbine in which steam pressure decreases gradually while expanding through the moving as well as through the fixed blade is known as reaction turbine. -In pure ... the steam to leave the moving blade as higher velocity than as which it entered.

Explain the Need of draft tube in reaction turbine .state the types of draft tube used in it

Description : Explain the Need of draft tube in reaction turbine .state the types of draft tube used in it

Last Answer : Draft tube is a pipe of gradually increasing diameter which connects the exit of runner of turbine to tail race. In case of reaction turbine , one part of available head is converted into K.E before ... . iv. Elbow draft tube with circular cross section at inlet and rectangular at outlet.

Explain the need of compounding. Suggest the method of compounding for reaction steam turbine with justification.

Description : Explain the need of compounding. Suggest the method of compounding for reaction steam turbine with justification.

Last Answer : Need of compounding: ✔The compounding of steam turbine means the methods to reduce the speed of rotor shaft. ✔To increase the thermal efficiency in power plants, high pressure and high ... compounding: i. Velocity compounding ii. Pressure compounding iii. Pressure-Velocity compounding 

Difference between Impulse turbine and Reaction turbine.

Description : Difference between Impulse turbine and Reaction turbine.

Last Answer : Impulse turbine Reaction turbine 1. Steam completely expands in nozzle and pressure remains constant during flow through the blade passage.2. Relative velocity of steam passing over blade of impulse ... more space per unit power. 6.The blades are aerofoil & non symmetrical type.

The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to...

Description : The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be

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For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np ) varies with NRe as (A) Np ∝ NRe (B) Np ∝ √NRe (C) Np → constan(D) Np ∝ 1/NRe

Description : For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np ) varies with NRe as (A) Np ∝ NRe (B) Np ∝ √NRe (C) Np → constan (D) Np ∝ 1/NRe

Last Answer : (D) Np ∝ 1/NRe

In a Rankine cycle, regeneration results in higher efficiency because (a) Pressure inside the boiler increases [GATE-2003] (b) Heat is added before steam enters the low pressure turbine (c) Average temperature of heat addition in the boiler increases (d) Total work delivered by the turbine increases

Description : In a Rankine cycle, regeneration results in higher efficiency because (a) Pressure inside the boiler increases [GATE-2003] (b) Heat is added before steam enters the low pressure turbine (c) ... temperature of heat addition in the boiler increases (d) Total work delivered by the turbine increases 

Last Answer : (c) Average temperature of heat addition in the boiler increases  

Which of the following needs to be incorporated to prevent the low pressure turbine exhaust wetness from being excessive? a) Double regeneration b) Double carbonization c) Double reheat d) Double cooling

Description : Which of the following needs to be incorporated to prevent the low pressure turbine exhaust wetness from being excessive? a) Double regeneration b) Double carbonization c) Double reheat d) Double cooling

Last Answer : c) Double reheat

Low head plants generally use (A) Pelton Turbines (B) Francis Turbine (C) Pelton or Francis Turbine (D) Kaplan Turbines

Description : Low head plants generally use (A) Pelton Turbines (B) Francis Turbine (C) Pelton or Francis Turbine (D) Kaplan Turbines

Last Answer : Ans: A In the hysterisis motor, the direction of rotation can be reversed by shifting the shaded pole region with respect to main pole. But not by changing supply lead because it has ac supply.

Turbine used for low head is?

Last Answer : Turbine used for low head is Kaplan turbine.

Describe working of continuously variable transmission with suitable sketch

Description : Describe working of continuously variable transmission with suitable sketch

Last Answer : A Vario-drive consists of two set of split pulleys - drive and driven pulley and drive belt between the pulleys. The drive pulley is fitted to the crankshaft and driven to rear wheel ... driven pulley gets decreased thus a reduced drive ratio between the driven and drive pulleys is obtained.

In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by (A) Increasing the oxygen concentration (B) Putting more quantity of V2O5 catalyst in the converter (C) Removing some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Description : In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to ... some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Last Answer : (C) Removing some quantity of SO3 during intermediate stage

Gas cooling as compared to water cooling of nuclear reactors (A) Cannot attain a high temperature (B) Is more efficient as gas has a higher specific heat (C) Can produce only saturated steam for feeding to power turbine (D) None of these

Description : Gas cooling as compared to water cooling of nuclear reactors (A) Cannot attain a high temperature (B) Is more efficient as gas has a higher specific heat (C) Can produce only saturated steam for feeding to power turbine (D) None of these

Last Answer : (D) None of these

Of the following oxygen administration devices, which has the advantage of providing high oxygen concentration? a) Non-rebreather mask The non-rebreather mask provides high oxygen concentration but is usually poor fitting. b) Venturi mask The Venturi mask provides low levels of supplemental oxygen. c) Catheter The catheter is an inexpensive device that provides a variable fraction of inspired oxygen and may cause gastric distention. d) Face tent A face tent provides a fairly accurate fraction of inspired oxygen, but is bulky and uncomfortable. It would not be the device of choice to provide high oxygen concentration.

Description : Of the following oxygen administration devices, which has the advantage of providing high oxygen concentration? a) Non-rebreather mask The non-rebreather mask provides high oxygen concentration but is ... and uncomfortable. It would not be the device of choice to provide high oxygen concentration.

Last Answer : a) Non-rebreather mask The non-rebreather mask provides high oxygen concentration but is usually poor fitting.

The ideal characteristic of a voltage stablizer is A) constant output voltage with low internal resistance B) constant output current with low internal resistance C) constant output voltage with high internal resistance D) constant internal resistance with variable output voltage.

Description : The ideal characteristic of a voltage stablizer is A) constant output voltage with low internal resistance B) constant output current with low internal resistance C) constant output voltage with high internal resistance D) constant internal resistance with variable output voltage.

Last Answer : A) constant output voltage with low internal resistance

The economic environment for this simulation game will include a. a favorable environment featuring limited growth, high inflation, and reasonable interest rates. b. a favorable environment featuring modest growth, low inflation, and reasonable interest rates. c. a highly variable environment featuring significant changes in growth, inflation, and drastic fluctuations in interest rates. d. a constant environment featuring measurable growth, constant inflation rates, and constant interest rates. e. economic downturn and other surprises.

Description : The economic environment for this simulation game will include a. a favorable environment featuring limited growth, high inflation, and reasonable interest rates. b. a favorable environment featuring ... inflation rates, and constant interest rates. e. economic downturn and other surprises.

Last Answer : b. a favorable environment featuring modest growth, low inflation, and reasonable interest rates.

High Voltage DC (HVDC) transmission is mainly used for

Description : High Voltage DC (HVDC) transmission is mainly used for  (A) bulk power transmission over very long distances (C) inter-connecting two systems with same nominal frequency (C) eliminating reactive power requirement in the operation (D) minimizing harmonics at the converter stations

Last Answer : High Voltage DC (HVDC) transmission is mainly used for bulk power transmission over very long distances 

The function of the earth wire in an extra high voltage line is to?

Description : The function of the earth wire in an extra high voltage line is to?

Last Answer : The function of the earth wire in an extra high voltage line is to provide a shield to the phase conductors from direct lightning stroke.

Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise)? (A) Propeller(B) Helical screw(C) Flat blade turbine(D) Curved blade turbine

Description : Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise)? (A) Propeller (B) Helical screw (C) Flat blade turbine (D) Curved blade turbine

Last Answer : (B) Helical screw

High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process: (A) Δ H = 0 and ΔS = 0 (B) Δ H ≠ 0 and ΔS = 0 (C) Δ H ≠ 0 and ΔS ≠ 0 (D) Δ H = 0 and ΔS ≠ 0

Description : High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process: ... (C) Δ H ≠ 0 and ΔS ≠ 0 (D) Δ H = 0 and ΔS ≠ 0

Last Answer : (B) Δ H ≠ 0 and ΔS = 0

Purpose of hydraulic accumulator is to (A) Ensure intermittent supply of hydraulic pressure (B) Increase the pressure and store/ accumulate it (C) Accumulate pressure to increase force (D) Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

Description : Purpose of hydraulic accumulator is to (A) Ensure intermittent supply of hydraulic pressure (B) Increase the pressure and store/ accumulate it (C) Accumulate pressure to increase force (D) Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

Last Answer : (D) Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

Water is not suitable as a calorimetric substance because it – (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vaporization

Description : Water is not suitable as a calorimetric substance because it – (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vaporization

Last Answer : (1) has high specific heat Explanation: The specific heat of water is higher than all other common substances. Hence, water is used for heating purposes (as in hot water bottles) and for cooling ... the liquids, mercury has the lowest specific heat due to which it is used as a thermometric liquid.

Water is not suitable as a calorimetric substance because it : (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vapourization

Description : Water is not suitable as a calorimetric substance because it : (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vapourization

Last Answer : has high specific heat