Explain the main difference between impulse and reaction turbine.

Explain the main difference between impulse and reaction turbine. 
by

1 Answer

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. In reaction turbine the outlet pressure of steam is less than the inlet pressure of the steam. There is reduction in pressure with the increase in kinetic energy.
by

Related questions

Explain the principle of working of impulse steam turbine.

Description : Explain the principle of working of impulse steam turbine. 

Last Answer : When steam enters the turbine it suffers a change in direction and momentum, which gives rise to the rotation of the turbine. There will be no drop in pressure in impulse steam turbine.  

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.

Explain principle of working of Impulse steam turbine with neat sketch.

Description : Explain principle of working of Impulse steam turbine with neat sketch.

Last Answer : Construction: Impulse turbine is simpler, less expensive and does not need to be pressure proof. It can operate with any pressure stream but is considerably less efficient. Impulse turbine consist of one ... by one set of moving blade ring as shown in Fig. for a single stage impulse turbine.

IMPULSE TURBINE

Description : IMPULSE TURBINE

Last Answer : IMPULSE TURBINE: Schematic of impulse steam turbine is shown in Fig. It has single-stage having a nozzle fitted in the casing followed by ring of moving blades mounted on the shaft. Variation of ... losing the velocity and thus causing rotation of moving blade ring mounted on shaft

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

How standard lightning impulse wave is represented?

Description : How standard lightning impulse wave is represented?

Last Answer : Answer: Standard Lighting impulse wave is represented by 1.2/50 micro sec wave

What is meant by impulse ratio of any lightning arrester?

Description : What is meant by impulse ratio of any lightning arrester?

Last Answer : Impulse ratio of any lightning arrester is the ratio of breakdown voltage of the wave of special duration to breakdown voltage of a 50Hz wave

What is Basic Impulse Level (BIL)?

Description : What is Basic Impulse Level (BIL)?

Last Answer : Basic Impulse Level (BIL) refer to the peak value of lightning impuse voltage withstand capability of the equipment

Define the followings. Insulation level, Rated short circuit breaking current, Making current, Short time rating, Impulse withstand voltage, Power frequency withstand voltage .

Description : Define the followings.   Insulation level, Rated short circuit breaking current, Making current, Short time rating, Impulse withstand voltage, Power frequency withstand voltage .

Last Answer : Insulation level - it is the combination of rated voltage, the corresponding impulse withstand voltage, which together characterize the insulation of the equipment as regards its ability to withstand ... wave of power frequency (50 Hz) which the insulation of equipment should withstand. 

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 

Comment on Mach number of steam in impulse and reaction turbines.

Description : Comment on Mach number of steam in impulse and reaction turbines. 

Last Answer : Mach number, in fluid mechanics, ratio of the velocity of a fluid to the velocity of sound in that fluid. Mach numbers less than one indicate subsonic flow; those greater than one, supersonic flow.

Which power plant has minimum operating cost? a) Hydroelectric power plant b) Thermal power plant c) Nuclear power plant d) Gas Turbine Power Plant Ans: A 42. Which of the following have highest operating cost? a) Hydroelectric power plant b) Thermal power plant c) Nuclear power plant d) Solar electric power plant

Description : Which power plant has minimum operating cost? a) Hydroelectric power plant b) Thermal power plant c) Nuclear power plant d) Gas Turbine Power Plant Ans: A 42. Which of the following have ... a) Hydroelectric power plant b) Thermal power plant c) Nuclear power plant d) Solar electric power plant

Last Answer : Ans: B

The propeller shaft speed in a turbo-electric, synchronous, propulsion drive motor is changed by varying the __________. A. turbine speed B. number of motor poles C. field strength of the generator D. field strength of the motor

Description : The propeller shaft speed in a turbo-electric, synchronous, propulsion drive motor is changed by varying the __________. A. turbine speed B. number of motor poles C. field strength of the generator D. field strength of the motor

Last Answer : Answer: A

Turbine-Generator Lubrication Oil System Function

Description : Turbine-Generator Lubrication Oil System Function

Last Answer : Turbine-Generator Lubrication Oil System Function For large turbine-generators forced lubrication system and water cooling system should be continuously required during the operation of the turbine-generator and ... when the oil pressure is low. A second backup dc pumps are sometimes provided.

State the factors, for the choice of electrical system for an aero turbine.

Description : State the factors, for the choice of electrical system for an aero turbine.

Last Answer : A:The choice of electrical system for an aero turbine is guided by three factors: Type of electrical output: dc, variable- frequency ac, and constant- frequency ac. Aero turbine ... energy output: in conjunction with battery or other form of storage, or interconnection with power grid.

What are the working fluids in gas turbine?

Description : What are the working fluids in gas turbine?

Last Answer : 1.Air 2.Helium 3.Argon 4.Carbon dioxide

What is the purpose of TOPP (turbine oil purification plant)?

Description : What is the purpose of TOPP (turbine oil purification plant)? 

Last Answer : The purpose of TOPP is to remove the water ingress in turbine oil system from the gland leaks, cooler leakage, and solid metal particles, which are produced due to rust, wear of bearings and to normalize the ... capacity of TOPP is, for solids - 5 microns and for water - 300 to 500 parts per milli.

State turbine governor setting.

Description : State turbine governor setting. 

Last Answer : On 2560 rpm turbine governor becomes effective and on 2760 rpm is turbine governor take over speed. 

What is the type turbine installed in KGS?

Description : What is the type turbine installed in KGS? 

Last Answer : Tandem compounded to expansion of steam, impulse reaction type.  

What type of governing system used in turbine and what are the purposes of the system?

Description : What type of governing system used in turbine and what are the purposes of the system? 

Last Answer : Hydraulic governing system of centrifugal (speed) governer type is adopted in turbine. Sensitive oil pressure to actuate centrifugal governer is 6.1 kg/cm2 (max). At 6.7 kg/cm2 relief valve ... speeder gear from BPC signal. Once synchronised the grid frequency and speeder gear controls the speed. 

Write critical speeds of turbine generator?

Description : Write critical speeds of turbine generator?  

Last Answer : Generator rotor 1st critical speed 1283 rpm 2nd critical speed 3600 rpm Combined turbine generator 1st critical speed 1938 rpm 2nd critical speed 2120 rpm 3rd critical speed 2385 rpm 4th critical speed 2837 rpm 

What are the futures of turbine generator?

Description : What are the futures of turbine generator? 

Last Answer : a. Low heat drop b. Moisture control (HP-0.26%, LP-3%.) c. Turbine governing system d. 70% steam dumping to the condenser to avoid reactor trip. e. Gland sealing f. LP exhaust hood cooling g. Generator stator and rotor cooling h. Hydrogen sealing i. Static excitation 

How shaft voltage produced by turbine?

Description : How shaft voltage produced by turbine? 

Last Answer : Due to un-symmetry in the flux path of core, non-uniform air gap, un-symmetry in the rotor magnetic field during short circuit in the rotor winding, causes voltage to develop across the ends of rotor shaft. 

How dearator pressure is maintained after turbine trip?

Description : How dearator pressure is maintained after turbine trip? 

Last Answer : Pegging steam is used to maintain dearator pressure after turbine trip.  

How turbine oil purification is achieved?

Description : How turbine oil purification is achieved?

Last Answer : Oil purification is achieved by centrifugal operation.  

What is the purpose of turbine governing system?

Description : What is the purpose of turbine governing system?

Last Answer : Turbine governing system governs the speed of the turbine with the help of centrifugal governer. It reduces the steam inlet when turbine over speeds.  

What are the methods of removing moisture from turbine?

Description : What are the methods of removing moisture from turbine?

Last Answer : a. External method by moisture separator and reheater, which separates the moisture and reheates the steam. b. Internally by stainless steel mesh, which reduces moisture (water particles) to 1%. c. By main steam reheat. 

State the factors, for the choice of electrical system for an aero turbine.

Description : State the factors, for the choice of electrical system for an aero turbine.

Last Answer : The choice of electrical system for an aero turbine is guided by three factors: Type of electrical output: dc, variablefrequency ac, and constant- frequency ac. Aero turbine rotational speed ... output: in conjunction with battery or other form of storage, or interconnection with power grid.

Flue gases coming out from furnace is first going through a) Turbine b) Economizer c) Air pre-heater d) Chimney

Description : Flue gases coming out from furnace is first going through a) Turbine b) Economizer c) Air pre-heater d) Chimney

Last Answer : Ans: Economizer

Water hamming effect is occurs in a) Surge tank b) Penstock c) Turbine d) Reservoir

Description : Water hamming effect is occurs in a) Surge tank b) Penstock c) Turbine d) Reservoir

Last Answer : Ans: Penstock

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.

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

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.

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

Description : 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

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

the main purpose of the turbine in the turbojet engine is to -General Knowledge

Description : the main purpose of the turbine in the turbojet engine is to -General Knowledge

Last Answer : The main purpose of the turbine in the turbojet engine is to Drive the compressor.

What are the main causes of turbine vibration?

Description : What are the main causes of turbine vibration?

Last Answer : 2. unbalanced parts 3. poor alignment of parts 4. loose parts 5. rubbing parts 6. lubrication troubles 7. steam troubles 8. foundation troubles 9. cracked or excessively worn parts

The main difference between an electron tube and a transistor is the _____________. A. type of function they can perform B. reaction of electron flow through a gas or vacuum in a transistor C. reaction of electron flow through a semiconductor when placed in a tube D. reaction of electron flow through a semiconductor used to form a transistor

Description : The main difference between an electron tube and a transistor is the _____________. A. type of function they can perform B. reaction of electron flow through a gas or vacuum in a transistor C. ... when placed in a tube D. reaction of electron flow through a semiconductor used to form a transistor

Last Answer : Answer: D

What is the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre? -Biology

Description : What is the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre? -Biology

Last Answer : answer:

Explain armature reaction of an alternator and its effect on main flux at various power factor.

Description : Explain armature reaction of an alternator and its effect on main flux at various power factor.

Last Answer : 1. zero lagging pf: armature flux lags main flux by 180 . Hence effect is demagnetizing i.e the main flux is reduced 2. lagging pf: it has 2 components demagnetizing and cross magnetizing ... 5. zero leading pf: Armature flux is in phase with main flux. Effect is completely magnetizing.

Explain the mechanism of generation of light-induced impulse in the retina. -Biology

Description : Explain the mechanism of generation of light-induced impulse in the retina. -Biology

Last Answer : answer:

Explain the mechanism through which a sound produces a nerve impulse in the inner ear. -Biology

Description : Explain the mechanism through which a sound produces a nerve impulse in the inner ear. -Biology

Last Answer : answer:

Difference between open and closed cycle gas turbine.

Description : Difference between open and closed cycle gas turbine.

Last Answer : Closed Cycle Gas Turbine Open Cycle Gas Turbine  It works on closed cycle. The working fluid is recirculates again and again. It is a clean cycle. It works on open cycle. The fresh charge is ... complex and costly. Open cycle gas turbine plant is simple and less costly.

Explain The Mechanism Behind The Turbine Meter?

Description : Explain The Mechanism Behind The Turbine Meter?

Last Answer : Turbine meters consist of straight flow tube within which a turbine or fan is free to rotate about it s axis which is fixed along g the centre line of the tube. Mostly, a magnetic pick up ... in the form of electric pulses from the magnetic pick up with a frequency proportional to the flow rate.

Explain the working of a turbine meter.

Description : Explain the working of a turbine meter. 

Last Answer : Turbine meters consist of a straight flow tube within which a turbine or fan is free to rotate, about its axis which is fixed along the center line of the tube. Straightening vanes ... to flow rate. Turbine meter are primarily applied to measurement of clean and non-corrosive hydrocarbons.  

Explain Construction and working of Francis Turbine with neat sketch.

Description : Explain Construction and working of Francis Turbine with neat sketch.

Last Answer : The main parts of the Francis turbine are: 1) Penstock: It is the large pipe which conveys water from the upstream of the reservoir to the turbine runner. 2) Spiral casing: It is a closed passage ... After doing the work the water is discharge to the trail race through the draft tubes.

Draw and explain performance and operating characteristics curves of a Pelton turbine

Description : Draw and explain performance and operating characteristics curves of a Pelton turbine 

Last Answer : The followings are the important characteristic curves of a turbine : Main Characteristic Curves or Constant Head Curve. ... The speed of the turbine is varied by changing load on the turbine. For each value ... through the turbine as the load varies. Head may or may not kept constant.