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Fundamentals of Diesel Engines, Heat Exchangers, Pumps and Valves 17 HSW LU Hours


Quiz Questions

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