Engine Performance. Test 8 – Online Maritime Tests

Thermal efficiency refers to heat engines and is the ratio of _____

output on the shaft/flywheel to internally produced power.
horsepower to BTU input of fuel.
input to the output on the power take off.
Output to BTU converted in energy.

This characteristic shows output pressure of a pneumatic controller controlling water level. The level is fluctuating. What is wrong with the setting of the controller.?

The amplification is too small.
The proportional band is too small.
The range is too large.
The span is too narrow.

What measure of power developed inside a cylinder is obtained by using the formula PMI x cylinder section surface (cm2) x stroke (metre) : 75 ?

Effective horsepower.
Brake horsepower.
Metric Horsepower.
Indicated horsepower.

Suppose the Proportional Band of this pneumatic controller is increased to 500 % and the input variation remains the same. What would be the output variation ?

5 psi
0.2 psi
0.5 psi
1 psi

For which type of controller are these the input (left) and the response (right) characteristics ?

A pneumatic integrator
A proportional integrating controller
A pneumatic inverter
A pressure integrating controller

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