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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. 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
A controlled process of removing heat from a substance
1. decrease steam pressure 2. increase steam
Regulate the flow of refrigerant to the evaporator

2. NH3 (R-717) refrigerant
Forged steel
Is corrosive to non - ferrous metals in the presence of water
1. sliding vane 2. rotary lobe 3. rotary screw
Low pressure turbine

3. Ammonia (R-717) is classified in Safety Group
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
Prevent the shaft from moving axially with the thrust
B2
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment

4. The main components of an lithium bromide absorption refrigeration system are...
To remove heat from the condensing water
Blading - shaft - and seals
It sprays jets of cooling water into the exhaust steam to condense it
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.

5. Surging of dynamic air compressors can produce severe shock to the system and may be violent enough to damage the...
Low pressure turbine
1. sliding vane 2. rotary lobe 3. rotary screw
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Blading - shaft - and seals

6. Ammonia refrigerant will
Maximum axial seal clearance
Solenoid valves
A controlled process of removing heat from a substance
Not mix with mineral oils

7. In order to keep the gas pass of a gas turbine clean - the following must be done
Maximum axial seal clearance
Reciprocating
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

8. Solid lubricants are used for...
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
The fuel is injected into the cylinder by the injector
Regulate the flow of refrigerant to the evaporator
To rid the system of non - condensable gases

9. The free piston gas generator in a gas turbine cycle will take the place of...
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
The compressor and combustor
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
1. sliding vane 2. rotary lobe 3. rotary screw

10. Refrigeration systems are purged
1. decrease steam pressure 2. increase steam
Reversing
To rid the system of non - condensable gases
Prevent the shaft from moving axially with the thrust

11. In the internal combustion engine - the purpose of the rocker arm is to operate
Maximum axial seal clearance
To rid the system of non - condensable gases
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
The inlet valves

12. Refrigeration may be defined as...
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
Reversing
A controlled process of removing heat from a substance
Prevent the shaft from moving axially with the thrust

13. For a particular air sample - wet and dry bulb temperatures when plotted on a psychometric chart will help determine
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
Prevent the shaft from moving axially with the thrust
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
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.

14. In a dual shaft gas turbine the load is driven by a
Blading - shaft - and seals
B2
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.

15. The inlet pipe to the compressor must be...
At least as large as the compressor intake
Reversing
Reaction turbine
1. decrease steam pressure 2. increase steam

16. Brine used in ammonia indirect systems is usually made with
Reversing
Not mix with mineral oils
Calcium chloride
Forged steel

17. 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. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Is corrosive to non - ferrous metals in the presence of water

18. Before starting a small non - condensing turbine which of the following procedures would be performed?
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
The compressor and combustor
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

19. Rough running of a diesel engine is caused by...
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
Blading - shaft - and seals
Not mix with mineral oils

20. Steam turbine stationary nozzles serve to...
1. decrease steam pressure 2. increase steam
Blading - shaft - and seals
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
At least as large as the compressor intake

21. Of all the positive displacement air compressors - the ______ compressor can deliver the highest discharge pressure.
Reciprocating
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
Reaction turbine
Forged steel

22. The jet condenser is so named because...
The fuel is injected into the cylinder by the injector
To rid the system of non - condensable gases
It sprays jets of cooling water into the exhaust steam to condense it
Reaction turbine

23. The main purpose of a cooling tower is to...
To remove heat from the condensing 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
Cooling and aerating the steam in a steam condenser
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel

24. Connecting rods are usually made of...
Not mix with mineral oils
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Prevent the shaft from moving axially with the thrust
Forged steel

25. A pressure drop created across the turbine blades by the expanding steam is the basic operating principle of the...
Reaction turbine
B2
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

26. Air in a surface condenser
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Maximum axial seal clearance
Cooling and aerating the steam in a steam condenser
Calcium chloride

27. The disadvantages of a gas turbine include
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Reciprocating
Regulate the flow of refrigerant to the evaporator

28. 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

29. The deaerator is usually operated to maintain constant
Level
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.
The fuel is injected into the cylinder by the injector

30. Three different designs of rotary compressors are...
1. sliding vane 2. rotary lobe 3. rotary screw
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of 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
At least as large as the compressor intake

31. A gas turbine would be chosen where these characteristics are advantageous
Level
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
To remove heat from the condensing water
Is corrosive to non - ferrous metals in the presence of water

32. The evaporator is where
A controlled process of removing heat from a substance
The liquid refrigerant absorbs heat and boils
Reversing
It sprays jets of cooling water into the exhaust steam to condense it

33. In the common rail system used for injection of fuel into the diesel engine cylinder
To rid the system of non - condensable gases
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
The fuel is injected into the cylinder by the injector
The liquid refrigerant absorbs heat and boils

34. The purpose of the expansion valve is to...
Cooling and aerating the steam in a steam condenser
The liquid refrigerant absorbs heat and boils
Reciprocating
Regulate the flow of refrigerant to the evaporator

35. 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. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Not mix with mineral oils
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed

36. The component that allows for the switching from heating to cooling mode on an air heat pump is called a/an __________ valve?
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
A controlled process of removing heat from a substance
Reversing
Maximum axial seal clearance

37. Condenser cooling water is usually controlled by...
Solenoid valves
Cooling and aerating the steam in a steam condenser
1. decrease steam pressure 2. increase steam
At least as large as the compressor intake

38. The condenser extraction (condensate) pump normally supplies cooling Water to the...
Regulate the flow of refrigerant to the evaporator
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Solenoid valves
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.

39. Barring or turning gears are used to...
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Low pressure turbine
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

40. Compressed air is not used for...
Level
1. sliding vane 2. rotary lobe 3. rotary screw
Blading - shaft - and seals
Cooling and aerating the steam in a steam condenser