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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. 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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2. In a dual shaft gas turbine the load is driven by a
Maximum axial seal clearance
To rid the system of non - condensable gases
Low pressure turbine
Regulate the flow of refrigerant to the evaporator

3. For a particular air sample - wet and dry bulb temperatures when plotted on a psychometric chart will help determine
Maximum axial seal clearance
It sprays jets of cooling water into the exhaust steam to condense it
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.

4. In the internal combustion engine - the purpose of the rocker arm is to operate
At least as large as the compressor intake
B2
The fuel is injected into the cylinder by the injector
The inlet valves

5. A gas turbine would be chosen where these characteristics are advantageous
Regulate the flow of refrigerant to the evaporator
Low pressure turbine
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
1. little or no water requirements 2. low installation cost 3. high power to mass ratio

6. Ammonia refrigerant will
Cooling and aerating the steam in a steam condenser
Not mix with mineral oils
To remove heat from the condensing water
Calcium chloride

7. A pressure drop created across the turbine blades by the expanding steam is the basic operating principle of the...
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.
Solenoid valves
Reaction turbine
1. decrease steam pressure 2. increase steam

8. Refrigeration systems are purged
Regulate the flow of refrigerant to the evaporator
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
The fuel is injected into the cylinder by the injector
To rid the system of non - condensable gases

9. Brine used in ammonia indirect systems is usually made with
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
The liquid refrigerant absorbs heat and boils
Calcium chloride
Reversing

10. Surging of dynamic air compressors can produce severe shock to the system and may be violent enough to damage the...
Blading - shaft - and seals
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
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

11. The condenser extraction (condensate) pump normally supplies cooling Water to the...
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
The fuel is injected into the cylinder by the injector
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
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

12. Before starting a small non - condensing turbine which of the following procedures would be performed?
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
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Reciprocating

13. Condenser cooling water is usually controlled by...
Not mix with mineral oils
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
Solenoid valves
At least as large as the compressor intake

14. The disadvantages of a gas turbine include
Level
Prevent the shaft from moving axially with the thrust
Cooling and aerating the steam in a steam condenser
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency

15. Ammonia (R-717) is classified in Safety Group
B2
1. sliding vane 2. rotary lobe 3. rotary screw
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. little or no water requirements 2. low installation cost 3. high power to mass ratio

16. The free piston gas generator in a gas turbine cycle will take the place of...
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
It sprays jets of cooling water into the exhaust steam to condense it
The compressor and combustor
Reaction turbine

17. The jet condenser is so named because...
Cooling and aerating the steam in a steam condenser
Reversing
It sprays jets of cooling water into the exhaust steam to condense it
To remove heat from the condensing water

18. During the start- up of some reaction steam turbines - the thrust block is pushed against a stop in the direction of the inlet for...
Maximum axial seal clearance
Calcium chloride
Low pressure turbine
1. sliding vane 2. rotary lobe 3. rotary screw

19. Barring or turning gears are used to...
The compressor and combustor
It sprays jets of cooling water into the exhaust steam to condense it
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
To remove heat from the condensing water

20. NH3 (R-717) refrigerant
Solenoid valves
Is corrosive to non - ferrous metals in the presence of water
Maximum axial seal clearance
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.

21. The purpose of a thrust bearing is to...
Prevent the shaft from moving axially with the thrust
Forged steel
Regulate the flow of refrigerant to the evaporator
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

22. Connecting rods are usually made of...
The liquid refrigerant absorbs heat and boils
Is corrosive to non - ferrous metals in the presence of water
Forged steel
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed

23. The purpose of the expansion valve is to...
Maximum axial seal clearance
Regulate the flow of refrigerant to the evaporator
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

24. The inlet pipe to the compressor must be...
Cooling and aerating the steam in a steam condenser
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.
Low pressure turbine
At least as large as the compressor intake

25. The evaporator is where
Prevent the shaft from moving axially with the thrust
It sprays jets of cooling water into the exhaust steam to condense it
1. decrease steam pressure 2. increase steam
The liquid refrigerant absorbs heat and boils

26. The component that allows for the switching from heating to cooling mode on an air heat pump is called a/an __________ valve?
Reversing
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Maximum axial seal clearance
Regulate the flow of refrigerant to the evaporator

27. In the common rail system used for injection of fuel into the diesel engine cylinder
Reaction turbine
The fuel is injected into the cylinder by the injector
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors

28. Steam turbine stationary nozzles serve to...
Solenoid valves
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.
Not mix with mineral oils

29. Rough running of a diesel engine is caused by...
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
To rid the system of non - condensable gases
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
Not mix with mineral oils

30. Compressed air is not used for...
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Cooling and aerating the steam in a steam condenser
Not mix with mineral oils
Level

31. The deaerator is usually operated to maintain constant
Level
Maximum axial seal clearance
Blading - shaft - and seals
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

32. CSA B-52 applies to...
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Reversing
Level
Regulate the flow of refrigerant to the evaporator

33. In order to keep the gas pass of a gas turbine clean - the following must be done
Level
Calcium chloride
Reaction turbine
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. Refrigeration may be defined as...
A controlled process of removing heat from a substance
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
The compressor and combustor
Regulate the flow of refrigerant to the evaporator

35. The main components of an lithium bromide absorption refrigeration system are...
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
To remove heat from the condensing water
Prevent the shaft from moving axially with the thrust
To rid the system of non - condensable gases

36. Of all the positive displacement air compressors - the ______ compressor can deliver the highest discharge pressure.
Blading - shaft - and seals
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Reciprocating
Is corrosive to non - ferrous metals in the presence of water

37. The main purpose of a cooling tower is to...
1. decrease steam pressure 2. increase steam
Blading - shaft - and seals
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
To remove heat from the condensing water

38. Three different designs of rotary compressors are...
The compressor and combustor
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
Forged steel
1. sliding vane 2. rotary lobe 3. rotary screw

39. Air in a surface condenser
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Low pressure turbine
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
To rid the system of non - condensable gases

40. Solid lubricants are used for...
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
The compressor and combustor
Reaction turbine
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment