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Can too high viscosity cause damages to the fuel injection system?
It can only affect the atomisation.
It cannot cause any damages.
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.
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If an input value of a temperature controller connected to a heater is above the set point, this will result in:
A reduction of the output signal.
An increase of the output signal.
A stabilization of the output signal above the proportional band.
A narrowing of the proportional band.
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Select the components that are in your opinion the main components in a steam viscosity system:
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.
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What are the highest viscosity modern diesel engines are capable of burning?
Approximately 1 200 cSt, at 50 °C.
Approximately 700 cSt, at 50 °C.
Approximately 500 cSt, at 50 °C.
Approximately 1 000 cSt, at 50 °C.
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What determines the oil’s viscosity?
The oil’s content of cat fines.
The oil’s content of sediments.
Only the temperature.
Temperature and composition.
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What do we mean with a “180 grade fuel”?
Viscosity equal to or more than 180 cSt at 50 °C.
Viscosity equal to or less than 180 cSt at 70 °C.
Viscosity equal to or less than 180 cSt at 50 °C.
Viscosity equal to or more than 180 cSt at 70 °C.
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What gives the best separating effect?
Low throughput (m3/hr) low viscosity.
High throughput (m3/hr) low viscosity.
Low throughput (m3/hr) high viscosity.
High throughput (m3/hr) high viscosity.
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What is the most effective way of cleaning liquid fuels from solids and water?
Filter.
Centrifugal separators.
Settling tanks.
Additives.
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What is the working principle of the viscosity controller based on?
The temperature of the oil.
The drop in pressure that occurs in a capillary tube.
The increase in pressure that occurs in a capillary tube.
The oil’s speed through a capillary tube.
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What makes a Proportional-Integral-Derivative (PID) control different from a PI control?
The proportional band is narrower.
The control switches before the signal overshoots the set point value.
A “derivative” action increases the reaction time of the control system.
There is no difference between a PID and a PI.
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What type of unit is used when referring to “dynamic” viscosity?
Centipoise.
Milliparsel-seconds.
Centiparsecs.
Zahn.
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Which statement is true?
The proportional feedback control can reduce error response to disturbances but that it still allows a non-zero steady-state error.
The proportional feedback control can reduce error response to disturbances, and keep it to a steady correct value.
The proportional feedback control cannot reduce any errors.
The proportional feedback is the cause of error response.
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With the described viscosity sensor, the differential pressure is transferred to:
A magnetic coupling between viscosity sensor motor and gear pump.
A thermometer.
A resilient stainless steel housing and a stainless steel damping capillary.
An indicator and the viscosity controller.
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