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Top 20 Steam Turbine Basics Questions You Need to Know

 Q.1 A steam turbine converts the output from a steam generator into ?

Ans. A steam turbine is a device that converts the energy of high-pressure, high-temperature steam supplied by a steam generator into shaft work.

Q.2 The energy conversion occurring in a steam turbine is a ______ step process ?

Ans. The high pressure steam first expands in a nozzle, gains velocity & then loses this velocity when it impinges on the blades. So it is two step process.

Q.3 Depending on whether the back pressure is below or equal to the atmospheric pressure, how many types of turbines do exist?

Ans. Depending on whether the back pressure is below or equal to the atmospheric pressure, there are two types of turbines that exist- condensing & non-condensing turbines.

Q.4 The overall steam turbine generator arrangement of a power plant is designated as ________ compound on the basis of shaft orientation.

Ans. The overall steam turbine generator arrangement of a power plant is designated as tandem or cross-compound on the basis of shaft orientation.

Q.5 A steam turbine is basically an assemblage of ?

Ans. Nozzle & blades

Q.6 Thermal equilibrium means that the flow of steam is ?

Ans. When the steam flow is isentropic it is thermal equilibrium condition.

Q.7 The reheat factor is the ratio of ?

Ans. The ratio of cumulative heat drop to the isentropic heat drop is called the reheat factor.

Q.8 A regenerative steam cycle renders ?

Ans. The decreased work output per unit mass of steam as well as increased thermal efficiency.

Q.9 A nozzle is a duct through which the velocity of a fluid ?

Ans. A nozzle is a duct through which the velocity of a fluid increases at the expense of pressure.

Q.10 A duct which decreases the velocity of fluid & causes a corresponding increase in pressure is called ?

Ans. Diffuser

Q.11 The flow through a nozzle is regarded as ?

Ans. The flow through a nozzle is regarded as isentropic flow.

Q.12 The critical pressure gives the velocity of steam at the throat ?

Ans. The critical pressure gives the velocity of steam at the throat which is equal to the velocity of sound.

Q.13 What is the action of steam in a steam turbine?

Ans. Steam action in a steam turbine is Dynamic

Q.14 The ratio of total useful heat drop to the total isentropic heat drop is called?

Ans. Internal efficiency

Q.15 The ratio of the work done on the blades to the energy supplied to the blades is called ?

Ans. Blading efficiency

Q.16 A nozzle is said to be a convergent nozzle when?

Ans. In case of a convergent nozzle, the cross-section of the nozzle decreases continuously from entrance to exit.

Q.17 Multi-stage steam turbines are of the ?

Ans. There are various types of multi-stage steam turbines which are, reaction; velocity compounded; & pressure compounded, respectively.

Q.18 The impulse reaction turbine has its driving force ?

Ans. The impulse reaction turbine has its driving force partly as an impulsive force & partly as a reaction force as the components add to the resultant.

Q. 19 In a nozzle, whole frictional loss is assumed to occur between ?

Ans. In a nozzle, whole frictional loss is assumed to occur between the throat & exit of the nozzle.

Q. 20 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 ?

Ans. The required degree of reaction will be 0.67.

Boiler Objectives Questions :

BOE (Boiler Operation Engineer) Previous Year Exam Questions And Answers Set - 18

Boiler Operation Engineer (BOE) Previous Year Exam Questions And Answers Set - 19

Boiler Operation (BOE) Previous Year Multiple Choice Questions With Answer Set - 20

Boiler Operation Engineer (BOE) Previous Year Questions With Answer - 21

 Boiler Interview Questions : 

What are the factors which affect the Natural circulation ?

What is the difference between Tower type and Two pass conventional boiler?

What parameters are measured during Boiler PG test ?

Why the start up vent is used in Boilers?

List out the potential reasons for boiler tubes failure ? 

What is cold end corrosion in boiler and When it occurs ?

What is the circulation number in boiler ?

Most Important Steam Blowing Questions Asked In Central BOE Interview 

How it is been decided that RHS or LHS safety valve of steam drum is set at higher pressure ?

Why economiser is kept at the top of the boiler ?

How to minimize water hammer in pump

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