quiz 1

Description

power engineering 3b2 Quiz on quiz 1, created by TRAVIS CANNING on 26/02/2016.
TRAVIS CANNING
Quiz by TRAVIS CANNING, updated more than 1 year ago
TRAVIS CANNING
Created by TRAVIS CANNING over 8 years ago
17
1

Resource summary

Question 1

Question
A magneto ignition system: a. Does not require a coil b. Produces AC power c. Produces a hotter spark at high speeds d. Does not require points
Answer
  • a. Does not require a coil
  • b. Produces AC power
  • c. Produces a hotter spark at high speeds
  • d. Does not require points

Question 2

Question
The dual fuel engine: a. Does not require an injector b. May operate on a gas-air mixture only c. Do not have any valves d. None of the above
Answer
  • a. Does not require an injector
  • b. May operate on a gas-air mixture only
  • c. Do not have any valves
  • d. None of the above

Question 3

Question
Two types of steam nozzles used for steam turbines are convergent and; Divergent Stationary Convergent-Divergent Low Flow High Velocity
Answer
  • Divergent
  • Stationary
  • Convergent-Divergent
  • Low Flow
  • High Velocity

Question 4

Question
As the steam passes through the convergent nozzle there is a; Small pressure drop Large Pressure drop Small increase in pressure Large Increase in pressure Velocity decrease
Answer
  • Small pressure drop
  • Large Pressure drop
  • Small increase in pressure
  • Large Increase in pressure
  • Velocity decrease

Question 5

Question
A Reaction blade is characterized by a large entranced angle of almost (?) and a small discharge angle. 45 degrees 30 degrees 180 degrees 15 degrees 90 degrees
Answer
  • 45 degrees
  • 30 degrees
  • 180 degrees
  • 15 degrees
  • 90 degrees

Question 6

Question
The distinguishing feature if the reaction turbine is the fact that the pressure does drop across the; Stationary blades Moving blades There is no pressure drop Stationary and moving blades None of the above
Answer
  • Stationary blades
  • Moving blades
  • There is no pressure drop
  • Stationary and moving blades
  • None of the above

Question 7

Question
In order to reduce the steam and blade velocity, the following methods may be used; Pressure compounding Velocity compounding Pressure-Velocity compounding Mass compounding Acceleration compounding
Answer
  • I, II
  • I, III, IV
  • I, II, III
  • III, V
  • IV, V

Question 8

Question
For large impulse turbines, it is very common to have a velocity compound first stage, followed by;
Answer
  • Several pressure compounded stages in the same casing
  • Several pressure-velocity compounded stages in the same casing
  • Several Acceleration compounded stages in a separate casing
  • Several Velocity compounded stages in a separate casing
  • None of the above

Question 9

Question
Turbines fall into two major categories, Condensing and;
Answer
  • Low pressure
  • High Pressure
  • Double Flow
  • Non-condensing
  • Single flow

Question 10

Question
A non-condensing turbine is also called a;
Answer
  • Low-pressure turbine
  • Backpressure turbine
  • Front Pressure turbine
  • Bleed turbine
  • None of the above

Question 11

Question
High pressure, high temperature casings used with temperatures above 550 degrees, are made of;
Answer
  • Cast iron
  • Carbon steel
  • Aluminum
  • Copper
  • Cast alloy steel with 3% chromium and 1% molybdenum

Question 12

Question
The term for a material at a given maximum temperature and under constant pressure that continues to deform with a very slow increasing strain on the material is called;
Answer
  • Creep
  • Slowness
  • Tension
  • Crawl
  • None of the above

Question 13

Question
What percentage of pressure drop is there in a impulse turbine across the moving blades
Answer
  • 5%
  • 10%
  • 30%
  • 60%
  • There is no pressure drop

Question 14

Question
Seal Strips, used to allow close running clearance with relatively large clearance between heavy parts are often made of;
Answer
  • Carbon steel
  • Aluminum
  • Chrome-iron alloy
  • Nickel
  • Copper

Question 15

Question
In an impulse turbine, turbine thrust must be counteracted since failure to do so would result in;
Answer
  • Less pressure
  • Greater pressure
  • Contact between the moving and stationary parts
  • Contact between the moving parts and casing
  • None of the above

Question 16

Question
From the thrust bearing the shaft must be free to expand in either direction, thus, the shaft can have only (?) thrust bearing(s)
Answer
  • 1
  • 2
  • 3
  • 4
  • 5

Question 17

Question
Turbines can be used to drive;
Answer
  • Pumps
  • Compressors
  • Fans
  • Blowers
  • All of the above

Question 18

Question
What is the over speed trip for a turbine used for?
Answer
  • To shut down the turbine in case of low pressure
  • To shut down the turbine in case of high pressure
  • To shut down the turbine in case of high speed
  • Just another name for something that has no purpose
  • None of the above

Question 19

Question
Lubricating oil pressure on turbines is usually in the (?) Range?
Answer
  • 15psi – 40psi
  • 15KPa – 40KPa
  • 69KPa – 138KPa
  • 69psi – 138psi
  • None of the above

Question 20

Question
Before lubrication oil flows through the bearings of a turbine it needs to be cooled in the oil coolers. The typical outlet temperature, from the coolers, is in the (?) range.
Answer
  • 43 degrees C – 49 degrees C
  • 43 degrees F – 49 degrees F
  • 23 degrees C – 42 degrees C
  • 23 degrees F – 42 degrees F
  • None of the above

Question 21

Question
When left cold and at a standstill the weight of the rotor of a turbine will tend to cause the rotor to sag slightly. This is called;
Answer
  • Bending
  • Tapering
  • Sagging
  • Bowing
  • Hogging
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