| 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. |
| | True |
| | 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. |
| | True |
| | 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. |
| | Stroke, bore |
| | 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. |
| | True |
| | False |
| 5. | The ratio of an engine’s brake horsepower and its indicated horsepower is called the ____________ of the engine. |
| | Mechanical efficiency |
| | Electrical efficiency |
| Heat Exchangers: |
| 6. | ________________ heat exchangers use the same fluid for heating and cooling. |
| | Regenerative |
| | Non-regenerative |
| 7. | Single-pass heat exchangers have fluids that pass each other more than once through the use of U tubes and baffles. |
| | True |
| | False |
| 8. | The most familiar example of an air-to liquid heat exchanger is a _____________. |
| | Car radiator |
| | 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. |
| | True |
| | 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. |
| | Radiator |
| | Hotwell |
| 11. | The purpose of a ____________ is to remove the latent heat of vaporization, condensing the vapor into a liquid. |
| | Condenser |
| | Radiator |
| Pumps: |
| 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. |
| | True |
| | 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. |
| | True |
| | False |
| 14. | What are the indications that a centrifugal pump has cavitations? |
| | Noise |
| | Fluctuating discharge pressure and flow |
| | Fluctuating pump motor current |
| | None of the above |
| | All of the above |
| 15. | Shutoff head is the ____________________ that can be developed by a centrifugal pump operating at a set speed. |
| | Minimum head |
| | Maximum head |
| |
| 16. | A __________ pump, sometimes referred to as a single pump, is a pump having a single liquid (pump) cylinder. |
| | Simplex |
| | Duplex |
| 17. | Slippage is the rate at which the liquid leaks from the discharge of the pump back to the pump suction. |
| | True |
| | False |
| 18. | Positive displacement pumps are protected from over pressurization by a relief valve on the upstream side of the pump discharge valve. |
| | True |
| | False |
| 19. | The characteristic curve for a positive displacement pump operating at a certain speed is a ____________ on a graph of head versus flow. |
| | Horizontal line |
| | 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 _____________. |
| | Decreases |
| | Increases |
|
