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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
Low pressure turbine
It sprays jets of cooling water into the exhaust steam to condense it
Reversing

2. Brine used in ammonia indirect systems is usually made with
Calcium chloride
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
It sprays jets of cooling water into the exhaust steam to condense it
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

3. The purpose of the expansion valve is to...
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Regulate the flow of refrigerant to the evaporator
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

4. The inlet pipe to the compressor must be...
Low pressure turbine
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
At least as large as the compressor intake
1. sliding vane 2. rotary lobe 3. rotary screw

5. Ammonia (R-717) is classified in Safety Group
A controlled process of removing heat from a substance
Maximum axial seal clearance
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
B2

6. The component that allows for the switching from heating to cooling mode on an air heat pump is called a/an __________ valve?
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.
Reversing
At least as large as the compressor intake

7. Compressed air is not used for...
Regulate the flow of refrigerant to the evaporator
Cooling and aerating the steam in a steam condenser
1. Drain the condensate from steam line and turbine casing. 2. Check oil level in bearing sumps or reservoir.
1. decrease steam pressure 2. increase steam

8. Condenser cooling water is usually controlled by...
Solenoid valves
1. little or no water requirements 2. low installation cost 3. high power to mass ratio
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 inlet valves

9. Ammonia refrigerant will
The liquid refrigerant absorbs heat and boils
Reversing
1. sliding vane 2. rotary lobe 3. rotary screw
Not mix with mineral oils

10. In the internal combustion engine - the purpose of the rocker arm is to operate
The fuel is injected into the cylinder by the injector
Is corrosive to non - ferrous metals in the presence of water
The inlet valves
At least as large as the compressor intake

11. Refrigeration may be defined as...
Blading - shaft - and seals
To remove heat from the condensing water
A controlled process of removing heat from a substance
1. decrease steam pressure 2. increase steam

12. Connecting rods are usually made of...
1. sliding vane 2. rotary lobe 3. rotary screw
Level
Forged steel
At least as large as the compressor intake

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

14. The jet condenser is so named because...
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
Solenoid valves
It sprays jets of cooling water into the exhaust steam to condense it
The fuel is injected into the cylinder by the injector

15. The disadvantages of a gas turbine include
The fuel is injected into the cylinder by the injector
Is corrosive to non - ferrous metals in the presence of water
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
It sprays jets of cooling water into the exhaust steam to condense it

16. 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. 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. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems

17. In order to keep the gas pass of a gas turbine clean - the following must be done
The liquid refrigerant absorbs heat and boils
Low pressure 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
Level

18. Solid lubricants are used for...
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Not mix with mineral oils
Reaction turbine

19. The free piston gas generator in a gas turbine cycle will take the place of...
The inlet valves
Calcium chloride
Cooling and aerating the steam in a steam condenser
The compressor and combustor

20. Rough running of a diesel engine is caused by...
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. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
Low pressure turbine

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

22. 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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23. The purpose of a thrust bearing is to...
Solenoid valves
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
Prevent the shaft from moving axially with the thrust
Maximum axial seal clearance

24. Barring or turning gears are used to...
1. sliding vane 2. rotary lobe 3. rotary screw
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
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
Solenoid valves

25. Refrigeration systems are purged
Maximum axial seal clearance
To rid the system of non - condensable gases
Forged steel
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.

26. 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
Low pressure turbine
The liquid refrigerant absorbs heat and boils
1. little or no water requirements 2. low installation cost 3. high power to mass ratio

27. For a particular air sample - wet and dry bulb temperatures when plotted on a psychometric chart will help determine
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
Blading - shaft - and seals
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. Three different designs of rotary compressors are...
B2
1. sliding vane 2. rotary lobe 3. rotary screw
1. fuel costs are high 2. the operating noise level is high 3. low thermal efficiency
1. decrease steam pressure 2. increase steam

29. A gas turbine would be chosen where these characteristics are advantageous
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
The inlet valves
1. little or no water requirements 2. low installation cost 3. high power to mass ratio

30. NH3 (R-717) refrigerant
Reciprocating
It sprays jets of cooling water into the exhaust steam to condense it
1. high temperature application 2. where chemical contamination is possible 3. on electrical equipment
Is corrosive to non - ferrous metals in the presence of water

31. 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.
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
Reversing

32. Steam turbine stationary nozzles serve to...
1. decrease steam pressure 2. increase steam
To remove heat from the condensing water
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
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

33. In the common rail system used for injection of fuel into the diesel engine cylinder
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 fuel is injected into the cylinder by the injector
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.

34. Of all the positive displacement air compressors - the ______ compressor can deliver the highest discharge pressure.
Reciprocating
Solenoid valves
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

35. CSA B-52 applies to...
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
Generator - condenser - receiver - expansion valve - evaporator - absorber - aqua pump.
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed

36. A pressure drop created across the turbine blades by the expanding steam is the basic operating principle of the...
1. imperfect injection 2. worn injectors 3. injection timed too early 4. improper grade of fuel
To rid the system of non - condensable gases
Reaction turbine
Prevent the shaft from moving axially with the thrust

37. The condenser extraction (condensate) pump normally supplies cooling Water to the...
1. Turbine casing drain coolers 2. gland steam condensers 3. air ejectors
Reaction turbine
To remove heat from the condensing water
Maximum axial seal clearance

38. The evaporator is where
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
The liquid refrigerant absorbs heat and boils
1. little or no water requirements 2. low installation cost 3. high power to mass ratio

39. The main purpose of a cooling tower is to...
Solenoid valves
To remove heat from the condensing water
1. design - construction and installation of refrigerating systems 2. operation and inspection of refrigerating systems
Forged steel

40. 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.
The compressor and combustor
1. increases the pressure 2. retards heat transfer 3. is cooled before being removed
Reaction turbine