Deck 6: Turbines and Motors

Question 1

All of the following are examples of turbine vibration except:

A) radial vibration
B) axial vibration
C) inboard outboard bearing vibration
D) stem vibration

Answer 1

stem vibration

Question 2

Excessive vibration could indicate all of the following except:

A) failing radial bearings
B) failing axial bearings
C) failed labyrinth seals
D) failed journal bearings
E) failed carbon rings
F) failed stator seals

Answer 2

failed stator seals

Question 3

An automatic valve that regulates the amount of steam admitted into a turbine is called the.

A) steam regulator
B) overspeed trip
C) throttle valve
D) governor valve

Answer 3

governor valve

Question 4

A safety device used to shutdown a turbine when it exceeds rotational limits is called a:

A) overspeed trip
B) safety trip lever
C) throttle valve
D) governor valve

Question 5

A typical governing system is divided into all of the following parts except:

A) speed sensitive
B) motion sensor amplifier to control valve
C) hydraulic sensitive electronics
D) control valve

Question 6

The lube oil system in a steam turbine lubricates bearings and gears, cools lubricated parts and acts as a hydraulic medium for the governor.

Question 7

The bearing that keeps the shaft from moving from side to side is called the:

A) thrust bearings
B) labyrinth bearings
C) radial bearings
D) mechanical bearings

Question 8

The bearing that keeps the shaft from moving horizontally is called the:

A) axial bearings
B) labyrinth bearings
C) radial bearings
D) mechanical bearings

Question 9

Select the four basic types of steam turbines.

A) condensing and non-condensing
B) steam and water
C) impulse and reactive
D) gas and wind

Question 10

In a steam turbine, the rotation of the blades in response to the steam is called:

A) impulse motion
B) rotor alignment
C) kinetic-mechanical energy conversion
D) impulse movement

Question 11

The amount of steam energy needed to perform useful work depends upon the pressure range through which the turbine expands.

Question 12

Giovanni di Branca designed the first impulse steam turbine in:

A) 1534 AD
B) 1629 AD
C) 1765 AD
D) 1876 AD

Question 13

The fixed blades in a steam turbine form a:

A) quarter crescent
B) half moon
C) three quarter moon
D) full moon

Question 14

Identify the main parts of a gas turbine.

Question 15

A procedure designed to remove condensate from a steam turbine, warm the internal parts and slow roll the turbine by bringing up the speed slowly is called:

A) heat soaking
B) thermal conditioning
C) Hunting
D) global rotation

Question 16

A shaft seal designed to stop flow consisting of a series of ridges and intricate paths is called a:

A) ridge seals
B) labyrinth seals
C) packing seals
D) mechanical seals

Question 17

A device used to connect the drive shaft of a motor or steam turbine to a pump, compressor or generator.

A) alignment connector
B) spider gear
C) coupling
D) quick slip connection

Question 18

Identify the main parts of a steam turbine.

Question 19

Steam enters a steam turbine at temperatures in excess of:

A) 500 F
B) 750 F
C) 1000 F
D) 1500 F

Question 20

Steam entry pressures into a steam turbine reach:

A) 1250 psi
B) 1750 psi
C) 2550 psi
D) 3500 psi

Question 21

The basic components of a gas turbine system include all of the following except:

A) a compressor
B) combustion chamber
C) a pump
D) a gas turbine

Question 22

In a steam turbine high velocity steam flows through the nozzle and is directed against a set of fixed blades.

Question 23

Turbines convert __________ __________ into useful mechanical energy that is used to drive rotating equipment.

A) electrical energy
B) steam energy
C) radiant energy
D) turbo-electric energy

Question 24

Shaft seals are located at the ends of each casing to minimize outward leakage of steam under pressure and enhance inward air leakage.

Question 25

Modern turbine design _________ the size of each stage giving the turbine a _________ shape.

A) increases, conical
B) decreases, conical
C) holds constant, tubular

Question 26

Two different types of governor systems used on steam turbines include all of the following except:

A) electronic hydraulic speed control
B) mechanical hydraulic speed control
C) instrument control distributive control system

Question 27

Identify the main parts of an electric motor.

Question 28

As the steam zig-zags between the stationary and moving blades it begins to expand as much as ________ times its original volume.

A) 50
B) 100
C) 200
D) 1000

Question 29

When a steam turbine speeds up or slows down while the controller searches for the correct operating speed is called:

A) searching
B) hunting
C) surging
D) slipping

Question 30

The maximum pressure delta ∆ across a steam turbine is:

A) 1050 psi
B) 1550 psi
C) 2350 psi
D) 3300 psi

Question 31

Modern turbine technology includes _____ or more stages linked axially along a horizontal shaft.

A) 10
B) 30
C) 50
D) 70

Question 32

In a steam turbine high pressure steam energy is converted to kinetic energy.

Question 33

The correct path for steam flow into and out of a steam turbine is:

A) throttle valve, steam chest, governor valve, nozzle, moving blades, fixed blades, moving blades, steam outlet
B) governor or throttle valve, nozzle block, rotor, casing outlet
C) steam chest, throttle valve, nozzle, moving blades, fixed blades, moving blades, casing outlet
D) throttle valve, steam chest and governor system, nozzle, moving blades, fixed blades, moving blades, steam outlet