Steam Turbines Archives - Chemical Engineering Site

Test Your knowledge on Steam Turbines – Online Quiz

chemicalengineeringsite — Sun, 11 Mar 2018 13:19:21 +0000

Steam Turbines find a wide range of use in Chemical Process Industry and power plants. The advantages of steam turbine include High-Speed Operation, Variable speed application, Use in Hazardous gas applications, High Reliability, Suits the plant steam balance and thus helps in process heat recovery etc. Power plants use steam turbines to produce electric power while the process plants use them to drive equipment like Pumps, Compressors in order to find the better use of heat energy.

This Online Quiz on Steam Turbines helps you to analyze your strengths and weaknesses. Let us take the test now.

In Impulse Turbine, Nozzle is

Stationary

Rotating

None

A velocity compounded stage is also called as

Rateau Stage

Curtis Stage

None

Steam Rate of the turbine is expressed in

USD/kg

kg/hr

kg/kW-hr

J/kW-hr

None

Overspeed of the Steam Turbine occurs when

Sudden Addition of Load

Sudden Loss of Load

Due to High Back Pressure

Due to Low Inlet Pressure

None

For Which Type of Steam Turbine Steam Rate is low?

Condensing Type

Back Pressure Type

None

Erosion in Steam Turbine occurs due to

Silica Deposition

Water Droplets

Continuous Operation

Overload

None

In case of Load Variation in Condensing Turbine, it affects how many Steam Levels?

Load Variation does not affect the steam level

None

For same power output, the Capital cost is high for

Electric Motor

Condensing Type Turbine

Back Pressure Type Turbine

Capital cost is same for Turbine/ Motor

None

In Multi Stage Turbines, Balance Piston reduces the load on

Journal Bearing

Thrust Bearing

None

10.

Over Speed Setting of the Turbine is

110% of the Operating Speed

110% of the Maximum Continuous Speed

150% of the Operating Speed

150% of the Maximum Continuous Speed

None

11.

Isentropic Efficiency of Steam Turbine is calculated by

Inlet Specific Enthalpy/Outlet Specific Enthalpy * 100

Inlet Steam Flow/ Outlet Steam Flow *100

Driven Equipment Power/ Turbine Power *100

(Inlet Specific Enthalpy - Outlet Specific Enthalpy) / (Inlet Specific Enthalpy - Ideal Outlet Specific Enthalpy)*100

None

12.

The Efficiency is Low for

Single Stage Turbine

Multi Stage Turbine

Electric Motor

All of them have equal efficiency

None

13.

Which one of the following is useful in calculating the efficiency of Steam Turbine?

Psychrometric chart

DePriester chart

Mollier diagram

Moody diagram

None

14.

API standard for General Purpose Steam Turbines is

API 611

API 612

API 616

API 618

None

15.

As per API 611, General Purpose Steam Turbine speed is limited to

1000 RPM

3000 RPM

6000 RPM

9000 RPM

None

16.

Slow Roll is recommended for

Warming up the turbine

To check the Integrity of the Turbine

All of the Above

None of the Above

None

17.

Recommended Minimum Service Life of the General Purpose Steam Turbine is

3 Years

5 Years

10 Years

20 Years

None

18.

Electronic Over speed Trip of the Turbine is set at

105% of the Rated Speed

110% of the Rated Speed

115% of the Rated Speed

127% of the Rated Speed

None

19.

Gland sealing is not required for

Back Pressure Type Turbines

Condensing Type Turbines

None

20.

Maximum allowable bearing oil outlet temperature is

52 Deg C

82 Deg C

92 Deg C

102 Deg C

None

21.

The steam Turbine rotor is made up of

Cast Iron

Forged Steel

Stainless Steel

Carbon

None

22.

Shaft Seals are used to

Prevent the steam leakage where the shafts extend through the casing

Prevent steam leakage between the diaphragm and the shaft

None

23.

Blade seals are used to

Prevent the steam leakage where the shafts extend through the casing

Prevent the steam leakage between the diaphragm and the shaft

None

24.

The purpose of using Turbine Turning Gear is

To check the Direction of Rotation of Turbine

To give the initial momentum for startup

To prevent rotors vulnerability to bow during shutdown

All of the Above

None

25.

In a Special Purpose Turbine Shaft End Seal used is

Labyrinth seals

Carbon ring seals

None

26.

Multi Valve Turbines are used for

Higher Power Application

High Speed Application

Lower Power Application

Low Speed Application

None

27.

The purpose of Nozzle box is to

Increase the Efficiency of the Turbine

Control the Speed of the Turbine

Prevent abnormal stress or cracking on casing

None of the above

None

28.

During Start up Turbine Exhaust Isolation Valve hat to be kept in

Full Open Position

Full Close Position

Partially Open Position

None

29.

What is Critical Speed in Steam Turbine?

Over speed of the Turbine is called as the Critical Speed of the Turbine

The Speed at which the turbines frequency is equal to its Natural frequency

Maximum Governor Speed

Maximum Continuous Operating Speed

None

30.

Commonly used Casing Type of Steam Turbine is

Horizontally Split Casing

Vertically Split Casing

None

Time's up

Time is Up!

Don’t miss our Cooling Tower Quiz, Compressors Quiz and Pump Quiz modules.

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