| 1. |
The compression ratio is a measure of how much the engine compresses the gasses in the engine’s cylinder. In a gasoline engine the compression ratio (which controls the compression temperature) is limited by the air-fuel mixture entering the cylinders. |
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True |
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False |
| 2. |
The crankshaft transforms the linear motion of the pistons into a rotational motion that is transmitted to the load. Crankshafts are made of forged steel. The forged crankshaft is machined to produce the crankshaft bearing and connecting rod bearing surfaces. |
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True |
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False |
| 3. |
___________ refers to the diameter of the engine’s cylinder, and _________ refers to the distance the piston travels from the top of the cylinder to the bottom. |
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Stroke, bore |
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Bore, stroke |
| 4. |
Turbo charging an engine occurs when the engine’s own exhaust gasses are forced through a turbine (impeller), which rotates and is connected to a second impeller located in the fresh air intake system. The impeller in the fresh air intake system compresses the fresh air. |
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True |
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False |
| 5. |
The ratio of an engine’s brake horsepower and its indicated horsepower is called the ____________ of the engine. |
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Mechanical efficiency |
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Electrical efficiency |
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Heat Exchangers:
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| 6. |
________________ heat exchangers use the same fluid for heating and cooling. |
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Regenerative |
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Non-regenerative |
| 7. |
Single-pass heat exchangers have fluids that pass each other more than once through the use of U tubes and baffles. |
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True |
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False |
| 8. |
The most familiar example of an air-to liquid heat exchanger is a _____________. |
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Car radiator |
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Inverter |
| 9. |
A vacuum pump may be any type of motor-driven air compressor. Its suction is attached to the condenser, and it discharges to the atmosphere. |
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True |
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False |
| 10. |
The __________ is the area at the bottom of the condenser where the condensed steam is collected to be pumped back into the system feed water. |
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Radiator |
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Hotwell |
| 11. |
The purpose of a ____________ is to remove the latent heat of vaporization, condensing the vapor into a liquid. |
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Condenser |
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Radiator |
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Pumps:
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| 12. |
The purpose of the diffuser is to increase the efficiency of the centrifugal pump by allowing a more gradual expansion and less turbulent area for the liquid to reduce in velocity. |
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True |
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Fase |
| 13. |
The enclosed impeller is constructed with a circular plate (the web) attached to one side of the blades. The semi-open impeller has circular plates attached to both sides of the blades. |
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True |
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False |
| 14. |
What are the indications that a centrifugal pump has cavitations? |
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Noise |
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Fluctuating discharge pressure and flow |
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Fluctuating pump motor current |
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None of the above |
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All of the above |
| 15. |
Shutoff head is the ____________________ that can be developed by a centrifugal pump operating at a set speed. |
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Minimum head |
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Maximum head |
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| 16. |
A __________ pump, sometimes referred to as a single pump, is a pump having a single liquid (pump) cylinder. |
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Simplex |
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Duplex |
| 17. |
Slippage is the rate at which the liquid leaks from the discharge of the pump back to the pump suction. |
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True |
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False |
| 18. |
Positive displacement pumps are protected from over pressurization by a relief valve on the upstream side of the pump discharge valve. |
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True |
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False |
| 19. |
The characteristic curve for a positive displacement pump operating at a certain speed is a ____________ on a graph of head versus flow. |
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Horizontal line |
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Vertical line |
| 20. |
As the viscosity of a liquid increases the maximum speed at which a reciprocating positive displacement pump operates decreases. Therefore, as viscosity increases, the maximum flow rate through the pump _____________. |
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Decreases |
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Increases |
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