Control systems I(Viscosity controller & OMD)

Centistokes is the unit to used to indicate

• Oil mist level

• pressure

• Viscosity

• None of the above

A HFO 180 grade fuel has a viscosity _______________ 180 Cst at 50^o C.

• equal to or less than

• Greater than

• Exactly equal to

The gear pump maintains a ___________ flow through the capillary arrangement to find the pressure difference as a measure of viscosity.

• Turbulent

• Laminar

• Axial

• All of the above

Normally, the output signal from the viscosensor is connected to _____________________.

• Flapper nozzle of the viscosity controller

• a 3 way solenoid valve

• measured value bellow of the viscosity controller

• None of the above

When the set value and measured viscosity values are same, the pneumatic controller makes the 3 way valve position

• to remain same and more of the steam bypasses the heater

• to open and more steam is supplied to the heater

• to open and more of the steam bypasses the heater

• to remain same and more steam is supplied to the heater

If the measured value of viscosity decreases when compared to the set value, the fuel oil has to be

• Cooled

• Heated

• Stopped

• None of the above

How may piezo elements are used in a vibration type of viscosity sensor?

• 5

• 4

• 3

• 2

In a high viscosity medium, the resonance frequency slightly shifts towards lower frequencies.

The statement is True or False (type it)

If the viscosity of the fuel oil and its viscosity index are on the higher side, it leads to

• poor combustion inside the engine cylinder

• Good combustion in the engine cylinder

• None of the above

The 3 way valve for temperature(Viscosity) control of fuel oil is controlled by

• Pneumatic controller

• Hydraulic controller

• Both the above

• None of the above