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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. A pressure drop created across the turbine blades by the expanding steam is the basic operating principle of the...
Cooling and aerating the steam in a steam condenser
Not mix with mineral oils
A controlled process of removing heat from a substance
Reaction turbine

2. Brine used in ammonia indirect systems is usually made with
At least as large as the compressor intake
Reciprocating
Not mix with mineral oils
Calcium chloride

3. Solid lubricants are used for...
The liquid refrigerant absorbs heat and boils
Reversing
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

4. The purpose of a thrust bearing is to...
It sprays jets of cooling water into the exhaust steam to condense it
Prevent the shaft from moving axially with the thrust
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
A controlled process of removing heat from a substance

5. Three different designs of rotary compressors are...
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
1. sliding vane 2. rotary lobe 3. rotary screw

6. The inlet pipe to the compressor must be...
It sprays jets of cooling water into the exhaust steam to condense it
At least as large as the compressor intake
The compressor and combustor
Cooling and aerating the steam in a steam condenser

7. The jet condenser is so named because...
Blading - shaft - and seals
At least as large as the compressor intake
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
It sprays jets of cooling water into the exhaust steam to condense it

8. 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
The fuel is injected into the cylinder by the injector
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
To remove heat from the condensing water

9. Of all the positive displacement air compressors - the ______ compressor can deliver the highest discharge pressure.
1. decrease steam pressure 2. increase steam
Reciprocating
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
1. sliding vane 2. rotary lobe 3. rotary screw

10. A gas turbine would be chosen where these characteristics are advantageous
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Reversing
Prevent the shaft from moving axially with the thrust
It sprays jets of cooling water into the exhaust steam to condense it

11. In a dual shaft gas turbine the load is driven by a
Forged steel
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. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
Low pressure turbine

12. The component that allows for the switching from heating to cooling mode on an air heat pump is called a/an __________ valve?
Reversing
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. 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
The inlet valves

13. Surging of dynamic air compressors can produce severe shock to the system and may be violent enough to damage the...
The fuel is injected into the cylinder by the injector
The compressor and combustor
Blading - shaft - and seals
Regulate the flow of refrigerant to the evaporator

14. NH3 (R-717) refrigerant
At least as large as the compressor intake
Cooling and aerating the steam in a steam condenser
Is corrosive to non - ferrous metals in the presence of water
Calcium chloride

15. The disadvantages of a gas turbine include
Solenoid valves
The fuel is injected into the cylinder by the injector
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
Cooling and aerating the steam in a steam condenser

16. Rough running of a diesel engine is caused by...
It sprays jets of cooling water into the exhaust steam to condense it
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
The liquid refrigerant absorbs heat and boils
Maximum axial seal clearance

17. The free piston gas generator in a gas turbine cycle will take the place of...
At least as large as the compressor intake
The compressor and combustor
Reaction turbine
Is corrosive to non - ferrous metals in the presence of water

18. The evaporator is where
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
The liquid refrigerant absorbs heat and boils
Reciprocating

19. Compressed air is not used for...
Cooling and aerating the steam in a steam condenser
To remove heat from the condensing water
Maximum axial seal clearance
1. sliding vane 2. rotary lobe 3. rotary screw

20. Air in a surface 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.
Reversing
Calcium chloride
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed

21. Steam turbine stationary nozzles serve to...
Low pressure turbine
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
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

22. The purpose of the expansion valve is to...
Prevent the shaft from moving axially with the thrust
Regulate the flow of refrigerant to the evaporator
Is corrosive to non - ferrous metals in the presence of water
Low pressure turbine

23. 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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24. The deaerator is usually operated to maintain constant
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
Calcium chloride
It sprays jets of cooling water into the exhaust steam to condense it
Level

25. Barring or turning gears are used to...
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Forged steel
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

26. In order to keep the gas pass of a gas turbine clean - the following must be done
B2
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. 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. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems

27. For a particular air sample - wet and dry bulb temperatures when plotted on a psychometric chart will help determine
To remove heat from the condensing water
Reciprocating
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
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.

28. Refrigeration systems are purged
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
Calcium chloride
To rid the system of non - condensable gases
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment

29. Ammonia refrigerant will
Reversing
Regulate the flow of refrigerant to the evaporator
Not mix with mineral oils
Forged steel

30. CSA B-52 applies to...
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
To remove heat from the condensing water
Maximum axial seal clearance

31. 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
Reaction turbine
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
At least as large as the compressor intake

32. Refrigeration may be defined as...
Cooling and aerating the steam in a steam condenser
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
A controlled process of removing heat from a substance
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

33. 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.
Not mix with mineral oils
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
Is corrosive to non - ferrous metals in the presence of water

34. Condenser cooling water is usually controlled by...
Solenoid valves
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
Level
1. sliding vane 2. rotary lobe 3. rotary screw

35. The main components of an lithium bromide absorption refrigeration system are...
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Solenoid valves
Maximum axial seal clearance

36. The main purpose of a cooling tower is to...
To remove heat from the condensing water
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
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.

37. The condenser extraction (condensate) pump normally supplies cooling Water to the...
Forged steel
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
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

38. Connecting rods are usually made of...
Forged steel
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
To remove heat from the condensing water
The liquid refrigerant absorbs heat and boils

39. Ammonia (R-717) is classified in Safety Group
B2
1. decrease steam pressure 2. increase steam
Reaction turbine
1. little or no water requirements 2. low installation cost 3. high power to mass ratio

40. In the internal combustion engine - the purpose of the rocker arm is to operate
The compressor and combustor
The inlet valves
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
Blading - shaft - and seals