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power engineering 3b2 Quiz on Power prep material, created by TRAVIS CANNING on 27/02/2016.
TRAVIS CANNING
Quiz by TRAVIS CANNING, updated more than 1 year ago
TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
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Resource summary

Question 1

Question
The two classifications of steam turbines include:
Answer
  • induction and extraction
  • condensing and non-condensing
  • impulse and reaction
  • compound and cross-compound
  • all of the above

Question 2

Question
The two types of steam turbines include
Answer
  • induction and extraction
  • condensing and non-condensing
  • impulse and reaction
  • compound and cross-compound
  • all of the above

Question 3

Question
Impulse turbine blades
Answer
  • create considerable end thrust
  • convert heat energy into kinetic energy
  • are either bucket shape or nozzle shaped
  • convert kinetic energy into useful work
  • are typically used in the low pressure stages of a turbine

Question 4

Question
Reaction turbine blades
Answer
  • are nozzle shaped
  • are bucket shaped
  • are a combination of bucket and nozzle shaped
  • produce little end thrust
  • all of the above

Question 5

Question
The pressure remains constant across the moving blades of an impulse turbine
Answer
  • True
  • False

Question 6

Question
The force applied to the blade is caused by changing the direction of the stream flow in an impulse turbine
Answer
  • True
  • False

Question 7

Question
Steam pressure drops across the moving blades of an impulse turbine
Answer
  • True
  • False

Question 8

Question
In a reaction turbine the steam pressure drops in both the stationary and rotating blades
Answer
  • True
  • False

Question 9

Question
In a reaction turbine the steam expands in the moving blades producing a reaction force
Answer
  • True
  • False

Question 10

Question
In a reaction turbine the velocity of the steam decreases in the stationary and moving blades
Answer
  • True
  • False

Question 11

Question
In a reaction turbine blade clearance between the rotor and the casing must be kept at a maximum to prevent rubbing.
Answer
  • True
  • False

Question 12

Question
Nozzles are used on steam turbines to
Answer
  • reduce the steam velocity to the blading
  • increase the enthalpy of the incoming steam
  • prevent moisture from entering the low pressure stages of the turbine
  • convert heat energy into kinetic energy
  • convert pressure energy into potential energy

Question 13

Question
The throttling effect of steam through a turbine nozzle
Answer
  • increased superheat, reduces pressure and increases the steam volume
  • reduced superheat, increases pressure and increase the steam volume
  • no change in superheat, reduces pressure and increases the steam volume
  • increased superheat, increased pressure, increased volume
  • heat loss, enthalpy gain and increase in velocity

Question 14

Question
In which type of turbine does the steam pressure drop in the nozzle and then remain constant through both the stationary and moving blades:
Answer
  • pressure compounding impulse turbine
  • reaction turbine
  • velocity compounded impulse turbine
  • non-condensing impulse turbine
  • none of the above

Question 15

Question
Steam velocity, blade velocity may be reduced in a multistage impulse turbine by: 1. Reducing turbine vacuum 2. pressure compounding 3. increasing blading length 4. velocity compounding
Answer
  • 1,2
  • 2,3
  • 1,3
  • 2,4
  • 3,4

Question 16

Question
Compounding steam turbines is used primarily to: 1. counteract axial thrust 2. reduce turbine rotor speed 3. Reduce friction losses 4. reduce turbine blade erosion 5. reduce turbine noise
Answer
  • 1,3,5
  • 2,3,4
  • 2,3
  • 1,2,3,4,5
  • 2,4

Question 17

Question
A dummy piston with balance pipe is used primarily on reaction turbines to:
Answer
  • reduce the clearance space between the blade tip and the casing
  • reduce turbine vibration
  • eliminate the use of a thrust bearing
  • offset the end thrust produced
  • none of the above

Question 18

Question
A turbine thrust bearing is typically lined with a soft metal known as
Answer
  • brass
  • babbit
  • lead
  • carbon
  • inconel

Question 19

Question
The purpose of a thrust bearing on a steam turbine is to: 1. Absorb rotor axial thrust 2. Reduce turbine vibration 3. Prevent steam leakage 4. Reduce steam velocity 5. keep the rotor in place within the casing
Answer
  • 1,2,5
  • 1,2,3,4
  • 2,3,4,5
  • 1,2,3,4,5
  • 1,5

Question 20

Question
Different types of steam turbine plants may be classified as:
Answer
  • impulse and reaction
  • compound and cross compound
  • condensing and non-condensing
  • SAGD and HRSG
  • Steam turbine and gas turbine

Question 21

Question
In addition to having a high thermal cycle efficiency, condensing steam plants have the following advantage.
Answer
  • a large amount of cooling water is required
  • low initial cost
  • little space is required
  • recovery of condensate is possible
  • all of the above

Question 22

Question
This type of turbine acts like a pressure reducing valve.
Answer
  • Back pressure Turbine
  • Rateau Turbine
  • Extraction turbine
  • Induction turbine
  • Cross-compound Turbine

Question 23

Question
This type of steam turbine has a better overall efficiency than a purely condensing steam turbine.
Answer
  • gas turbine
  • cross-compounded
  • tandem double-flow
  • bleeder turbine
  • none of the above

Question 24

Question
Another name for a condensing bleeder turbine would be referred to as
Answer
  • induction turbine
  • closed cycle steam turbine
  • extraction turbine
  • topping turbine
  • back pressure turbine

Question 25

Question
This type of turbine allows new high pressure boilers to provide steam to old lower pressure systems and could also be the back pressure turbine of a cross compound system
Answer
  • governing turbine
  • topping turbine
  • induction/extraction turbine
  • condensing turbine
  • reducing station turbine

Question 26

Question
The purpose of a coupling on a turbine is to:
Answer
  • A) compensate for axial expansion and contraction of the rotor
  • B) transmit power from one shaft to the other
  • C) keep the shaft from vibrating
  • D) both a and b
  • E) all of the above

Question 27

Question
The following pump is utilized on a turbine rotor while on barring gear to prevent rubbing inside the bearings
Answer
  • lifting oil pump
  • boilerfeed pump
  • hydraulic oil pump
  • jacking oil pump
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