Engineering, Control Systems. Test 1 – Online Maritime Tests

Which part of the mechanical governor is manipulated by the servo-motor to increase or decrease engine speed ?

The dashpot.
The linkage to the fuel rack.
The sensitivity band.
The compensating spring.

In the Main Engine sea water circuit why are the Lub Oil and the Scavenge air coolers fitted in front of the jacket and piston water coolers ?

For ease of installation.
The Scavenge air and Lub Oil coolers have by-pass valves fitted.
The Lub Oil and Scavenge air temperatures are lower.
They need more cooling water.

What calibrations are taken to determine piston ring wear on a Diesel engine?

Radial and axial thickness of ring.
Internal diameter when positioned in unworn cylinder.
Ring/groove clearance and butt gap in unworn cylinder.
Radial thickness of ring and butt gap in unworn cylinder.

As a rule of thumb, the time interval for automatic desludging of lubricating oil purifiers fitted on sumps of trunk-type engines should be set at _____ hours.

6 to 8
4 to 6
2 to 4
1 to 2

How is the fuel injection timing altered on a Diesel engine?

By moving the camshaft position.
By altering the injector setting.
By altering the fuel pump lift.
By adjusting the camshaft drive chain.

The narrow band of speed variation through which the governor makes no correction and refers to the sensitivity of the governor is known as the _____

sensitive band.
isochronous band.
dead band.
speed droop.

In a four stroke cycle diesel engine, the four stroke of the piston required to complete one cycle which must take place in regular order. The second stroke _____ .

is the power stroke.
draws air into the cylinder.
compresses the air.
expels the burned gases.

What are the indications of excessive cylinder clearance in a small diesel engine? I Loss of power. II Misfiring. III White exhaust smoke. IV Excessive consumption of lube oil.

I, II and IV
II, III and IV
I, III and IV
I, II and III

Review Answers