Test about Engine Oil Viscosity

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Right answers:
1

Can too high viscosity cause damages to the fuel injection system?

Your answer is correct:

It can damage parts of the fuel pump and their drive, it can cause the relief valves to spray off, and it can affect the atomisation of the fuel.
2

If an input value of a temperature controller connected to a heater is above the set point, this will result in:

Your answer is correct:

A reduction of the output signal.
3

Select the components that are in your opinion the main components in a steam viscosity system:

Correct answer:

Measuring tube built into fuel line, and provided with a thermometer and manometer.; Flow rate regulator.; Differential pressure converter.; Controller (proportional, proportional + integral or proportional + integral + differential).; Steam regulating valve.; Viscosensor.

Your Answer:

Measuring tube built into fuel line, and provided with a thermometer and manometer.; Flow rate regulator.; Controller (proportional, proportional + integral or proportional + integral + differential).; Viscosensor.
4

What are the highest viscosity modern diesel engines are capable of burning?

Your answer is correct:

Approximately 700 cSt, at 50 °C.
5

What determines the oil’s viscosity?

Your answer is correct:

Temperature and composition.
6

What do we mean with a “180 grade fuel”?

Your answer is correct:

Viscosity equal to or less than 180 cSt at 50 °C.
7

What gives the best separating effect?

Your answer is correct:

Low throughput (m3/hr) low viscosity.
8

What is the most effective way of cleaning liquid fuels from solids and water?

Your answer is correct:

Centrifugal separators.
9

What is the working principle of the viscosity controller based on?

Your answer is correct:

The drop in pressure that occurs in a capillary tube.
10

What makes a Proportional-Integral-Derivative (PID) control different from a PI control?

Your answer is correct:

A “derivative” action increases the reaction time of the control system.
11

What type of unit is used when referring to “dynamic” viscosity?

Your answer is correct:

Centipoise.
12

Which statement is true?

Your answer is correct:

The proportional feedback control can reduce error response to disturbances but that it still allows a non-zero steady-state error.
13

With the described viscosity sensor, the differential pressure is transferred to:

Correct answer:

An indicator and the viscosity controller.

Your Answer:

A resilient stainless steel housing and a stainless steel damping capillary.
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