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Power Engineering 5

Instructions:

Answer 40 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. The purpose of the expansion valve is to...
Regulate the flow of refrigerant to the evaporator
B2
Level
Reaction turbine

2. The component that allows for the switching from heating to cooling mode on an air heat pump is called a/an __________ valve?
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Blading - shaft - and seals
Reversing
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment

3. The jet condenser is so named because...
Regulate the flow of refrigerant to the evaporator
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
It sprays jets of cooling water into the exhaust steam to condense it

4. NH3 (R-717) refrigerant
Reaction turbine
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Is corrosive to non - ferrous metals in the presence of water
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed

5. Solid lubricants are used for...
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
Regulate the flow of refrigerant to the evaporator
Forged steel
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment

6. The condenser extraction (condensate) pump normally supplies cooling Water to the...
The compressor and combustor
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. increases the pressure 2. retards heat transfer 3. is cooled before being removed
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors

7. 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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8. Steam turbine stationary nozzles serve to...
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
The liquid refrigerant absorbs heat and boils
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

9. Refrigeration may be defined as...
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
The fuel is injected into the cylinder by the injector
A controlled process of removing heat from a substance
Reciprocating

10. The deaerator is usually operated to maintain constant
Level
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.
Calcium chloride
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

11. The disadvantages of a gas turbine include
To rid the system of non - condensable gases
Maximum axial seal clearance
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
Blading - shaft - and seals

12. Air in a surface condenser
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
To remove heat from the condensing water
The compressor and combustor
Reaction turbine

13. Rough running of a diesel engine is caused by...
1. decrease steam pressure 2. increase steam
Reversing
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
Forged steel

14. Ammonia refrigerant will
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. inspect and clean air intake filters 2. inspect and clean air intake ducts 3. water wash the compressor blades 4. use good quality fuel
Not mix with mineral oils
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors

15. Brine used in ammonia indirect systems is usually made with
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
Cooling and aerating the steam in a steam condenser
Calcium chloride
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

16. Of all the positive displacement air compressors - the ______ compressor can deliver the highest discharge pressure.
Is corrosive to non - ferrous metals in the presence of water
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Prevent the shaft from moving axially with the thrust
Reciprocating

17. The evaporator is where
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
Cooling and aerating the steam in a steam condenser
A controlled process of removing heat from a substance
The liquid refrigerant absorbs heat and boils

18. Connecting rods are usually made of...
Forged steel
Calcium chloride
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Reciprocating

19. Ammonia (R-717) is classified in Safety Group
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
To remove heat from the condensing water
B2

20. Before starting a small non - condensing turbine which of the following procedures would be performed?
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
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. increases the pressure 2. retards heat transfer 3. is cooled before being removed

21. 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
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
A controlled process of removing heat from a substance
It sprays jets of cooling water into the exhaust steam to condense it

22. In the internal combustion engine - the purpose of the rocker arm is to operate
Low pressure turbine
The inlet valves
Forged steel
1. decrease steam pressure 2. increase steam

23. The purpose of a thrust bearing is to...
1. decrease steam pressure 2. increase steam
The liquid refrigerant absorbs heat and boils
Prevent the shaft from moving axially with the thrust
Forged steel

24. Surging of dynamic air compressors can produce severe shock to the system and may be violent enough to damage the...
Blading - shaft - and seals
The compressor and combustor
To remove heat from the condensing water
Solenoid valves

25. The free piston gas generator in a gas turbine cycle will take the place of...
1. decrease steam pressure 2. increase steam
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 compressor and combustor
Blading - shaft - and seals

26. During the start- up of some reaction steam turbines - the thrust block is pushed against a stop in the direction of the inlet for...
Calcium chloride
It sprays jets of cooling water into the exhaust steam to condense it
Maximum axial seal clearance
At least as large as the compressor intake

27. Three different designs of rotary compressors are...
1. sliding vane 2. rotary lobe 3. rotary screw
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
The compressor and combustor
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel

28. 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. 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
Low pressure turbine
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment

29. CSA B-52 applies to...
The fuel is injected into the cylinder by the injector
Is corrosive to non - ferrous metals in the presence of water
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

30. The main purpose of a cooling tower is to...
A controlled process of removing heat from a substance
Cooling and aerating the steam in a steam condenser
Reaction turbine
To remove heat from the condensing water

31. The inlet pipe to the compressor must be...
Calcium chloride
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
At least as large as the compressor intake
The inlet valves

32. Condenser cooling water is usually controlled by...
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Reversing
Solenoid valves
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel

33. The main components of an lithium bromide absorption refrigeration system are...
Solenoid valves
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
Reversing
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

34. Refrigeration systems are purged
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
To rid the system of non - condensable gases
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
Blading - shaft - and seals

35. Barring or turning gears are used to...
The fuel is injected into the cylinder by the injector
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Calcium chloride
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

36. Compressed air is not used for...
Forged steel
Cooling and aerating the steam in a steam condenser
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Reversing

37. A pressure drop created across the turbine blades by the expanding steam is the basic operating principle of the...
To rid the system of non - condensable gases
1. sliding vane 2. rotary lobe 3. rotary screw
Reaction turbine
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

38. A gas turbine would be chosen where these characteristics are advantageous
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Is corrosive to non - ferrous metals in the presence of water
Prevent the shaft from moving axially with the thrust

39. 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.
Calcium chloride
Cooling and aerating the steam in a steam condenser
Is corrosive to non - ferrous metals in the presence of water

40. 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
B2
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
Prevent the shaft from moving axially with the thrust