The combustion chamber shape MOST-Likely to have a squish/quench area that causes movement (turbulence) of the air-fuel mixture and cooling of the gases to prevent abnormal combustion is:
A. hemi
B. wedge
C. pent-roof
D. scalene
Answer: B
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In a heavy-duty diesel engine, which of the following is more likely to be described as tuned?
A. intake manifold B. air to air cooler C. exhaust manifold D. main exhaust pipe
The stack switch or stack relay ____.
A. starts the fan motor when the thermostat calls for heat B. shuts down the burner if it does not sense heat in the stack C. cuts off the ignition after the flame has been established D. All of the above.
____ roofs can provide window shading to reduce solar gain in hot climates.
A. Deck B. Porch C. Patio D. Deck and patio
With reference to Example 18.10, determine the best combination of current magnitude and wire diameter to reduce the volume of the solenoid coil to a minimum. Will this minimum volume result in the lowest possible resistance? How does the power dissipation of the coil change with the wire gauge and current value? To solve this problem, you will need to find a table of wire gauge diameter, resistance, and current ratings. Table 2.2 in this book contains some information. The solution can only be found numerically.
Example 18.10
Figure 18.40 depicts a simplified representation of a solenoid. The restoring force for the plunger is provided by a spring.
1. Derive a general expression for the force exerted on the plunger as a function of the plunger position x.
2. Determine the mmf required to pull the plunger to its end position (x = a).
Assumptions:
Use of Copper wire in solenoid
In order to access the effects of the wire diameter and current magnitude to the volume, resistance, and power dissipated, mathematical expressions need to be developed for each variable.