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Power Engineering 5

Instructions:

Answer 40 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. In order to keep the gas pass of a gas turbine clean - the following must be done
1. inspect and clean air intake filters 2. inspect and clean air intake ducts 3. water wash the compressor blades 4. use good quality fuel
Low pressure turbine
1. what the relative humidity is. 2. what the dew point is. 3. how much moisture is in the air. 4. what the dryness factor is.
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

2. The disadvantages of a gas turbine include
Not mix with mineral oils
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
To rid the system of non - condensable gases
Is corrosive to non - ferrous metals in the presence of water

3. Condenser cooling water is usually controlled by...
Blading - shaft - and seals
1. RPM's decrease 2. centrifugal force on governor decreases 3. spring causes governor flyballs to move inward4. governor linkage causes steam valve to open 5. more steam is admitted 6. RPM's increase
1. decrease steam pressure 2. increase steam
Solenoid valves

4. If the speed of a turbine decreases due to additional generator loading - the correct sequence of events that occurs in the speed governor is as follows

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5. Three different designs of rotary compressors are...
The compressor and combustor
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Regulate the flow of refrigerant to the evaporator
1. sliding vane 2. rotary lobe 3. rotary screw

6. The jet condenser is so named because...
To remove heat from the condensing water
1. sliding vane 2. rotary lobe 3. rotary screw
It sprays jets of cooling water into the exhaust steam to condense it
B2

7. The condenser extraction (condensate) pump normally supplies cooling Water to the...
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
1. what the relative humidity is. 2. what the dew point is. 3. how much moisture is in the air. 4. what the dryness factor is.
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
1. RPM's decrease 2. centrifugal force on governor decreases 3. spring causes governor flyballs to move inward4. governor linkage causes steam valve to open 5. more steam is admitted 6. RPM's increase

8. The evaporator is where
Regulate the flow of refrigerant to the evaporator
The liquid refrigerant absorbs heat and boils
Is corrosive to non - ferrous metals in the presence of water
1. rotate the turbine shaft periodically to prevent it from sagging 2. rotate the shaft at slow speed when the turbine is not in service

9. Of all the positive displacement air compressors - the ______ compressor can deliver the highest discharge pressure.
1. sliding vane 2. rotary lobe 3. rotary screw
The compressor and combustor
Low pressure turbine
Reciprocating

10. A gas turbine would be chosen where these characteristics are advantageous
To remove heat from the condensing water
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
Prevent the shaft from moving axially with the thrust

11. The inlet pipe to the compressor must be...
At least as large as the compressor intake
Low pressure turbine
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors

12. Refrigeration may be defined as...
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Prevent the shaft from moving axially with the thrust
1. decrease steam pressure 2. increase steam
A controlled process of removing heat from a substance

13. Steam turbine stationary nozzles serve to...
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
Forged steel
The liquid refrigerant absorbs heat and boils
1. decrease steam pressure 2. increase steam

14. In a dual shaft gas turbine the load is driven by a
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
Low pressure turbine
A controlled process of removing heat from a substance

15. In the internal combustion engine - the purpose of the rocker arm is to operate
The inlet valves
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
The liquid refrigerant absorbs heat and boils
1. sliding vane 2. rotary lobe 3. rotary screw

16. Rough running of a diesel engine is caused by...
Calcium chloride
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems

17. During the start- up of some reaction steam turbines - the thrust block is pushed against a stop in the direction of the inlet for...
Regulate the flow of refrigerant to the evaporator
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
1. RPM's decrease 2. centrifugal force on governor decreases 3. spring causes governor flyballs to move inward4. governor linkage causes steam valve to open 5. more steam is admitted 6. RPM's increase
Maximum axial seal clearance

18. The purpose of the expansion valve is to...
The inlet valves
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
Regulate the flow of refrigerant to the evaporator
Prevent the shaft from moving axially with the thrust

19. A pressure drop created across the turbine blades by the expanding steam is the basic operating principle of the...
Is corrosive to non - ferrous metals in the presence of water
It sprays jets of cooling water into the exhaust steam to condense it
At least as large as the compressor intake
Reaction turbine

20. Surging of dynamic air compressors can produce severe shock to the system and may be violent enough to damage the...
A controlled process of removing heat from a substance
Blading - shaft - and seals
Forged steel
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency

21. Barring or turning gears are used to...
1. rotate the turbine shaft periodically to prevent it from sagging 2. rotate the shaft at slow speed when the turbine is not in service
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Low pressure turbine
B2

22. The free piston gas generator in a gas turbine cycle will take the place of...
1. sliding vane 2. rotary lobe 3. rotary screw
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
The compressor and combustor
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

23. Before starting a small non - condensing turbine which of the following procedures would be performed?
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
The compressor and combustor
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
To remove heat from the condensing water

24. NH3 (R-717) refrigerant
Forged steel
Is corrosive to non - ferrous metals in the presence of water
The fuel is injected into the cylinder by the injector
Calcium chloride

25. The main components of an lithium bromide absorption refrigeration system are...
At least as large as the compressor intake
B2
Reciprocating
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.

26. Refrigeration systems are purged
The liquid refrigerant absorbs heat and boils
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
Blading - shaft - and seals
To rid the system of non - condensable gases

27. The purpose of a thrust bearing is to...
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
Prevent the shaft from moving axially with the thrust
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
The inlet valves

28. Ammonia (R-717) is classified in Safety Group
B2
Low pressure turbine
Reaction turbine
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors

29. Ammonia refrigerant will
Not mix with mineral oils
1. what the relative humidity is. 2. what the dew point is. 3. how much moisture is in the air. 4. what the dryness factor is.
1. decrease steam pressure 2. increase steam
1. sliding vane 2. rotary lobe 3. rotary screw

30. Brine used in ammonia indirect systems is usually made with
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
Calcium chloride
The compressor and combustor
1. inspect and clean air intake filters 2. inspect and clean air intake ducts 3. water wash the compressor blades 4. use good quality fuel

31. The main purpose of a cooling tower is to...
The fuel is injected into the cylinder by the injector
The inlet valves
To remove heat from the condensing water
At least as large as the compressor intake

32. In the common rail system used for injection of fuel into the diesel engine cylinder
The fuel is injected into the cylinder by the injector
Level
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Prevent the shaft from moving axially with the thrust

33. CSA B-52 applies to...
1. RPM's decrease 2. centrifugal force on governor decreases 3. spring causes governor flyballs to move inward4. governor linkage causes steam valve to open 5. more steam is admitted 6. RPM's increase
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
1. inspect and clean air intake filters 2. inspect and clean air intake ducts 3. water wash the compressor blades 4. use good quality fuel

34. For a particular air sample - wet and dry bulb temperatures when plotted on a psychometric chart will help determine
1. what the relative humidity is. 2. what the dew point is. 3. how much moisture is in the air. 4. what the dryness factor is.
The liquid refrigerant absorbs heat and boils
It sprays jets of cooling water into the exhaust steam to condense it
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

35. Compressed air is not used for...
1. decrease steam pressure 2. increase steam
Cooling and aerating the steam in a steam condenser
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems

36. The component that allows for the switching from heating to cooling mode on an air heat pump is called a/an __________ valve?
It sprays jets of cooling water into the exhaust steam to condense it
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Regulate the flow of refrigerant to the evaporator
Reversing

37. The deaerator is usually operated to maintain constant
Maximum axial seal clearance
A controlled process of removing heat from a substance
1. sliding vane 2. rotary lobe 3. rotary screw
Level

38. Connecting rods are usually made of...
Forged steel
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
The liquid refrigerant absorbs heat and boils
Regulate the flow of refrigerant to the evaporator

39. Air in a surface condenser
At least as large as the compressor intake
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Is corrosive to non - ferrous metals in the presence of water
Level

40. Solid lubricants are used for...
Forged steel
Is corrosive to non - ferrous metals in the presence of water
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
The fuel is injected into the cylinder by the injector