Alternative Questions and Answers for the Mechanical Test - Jamaica
What may cause the generator to stop charging?
(1) A broken fan belt (2) Worn down brushes
What is used to indicate the oil pressure?
(1) A gauge on the dashboard (2) A green light on the dashboard
What would you suspect if water is coming from the tail pipe?
(1) Cracked cylinder block (2)Damaged cylinder head gasket
What precautions should be taken to fill a radiator while it is hot?
(1) Fill with hot water (2)Fill with cool water while the engine idles
If bubbling in radiator is seen in the cap is removed, what would this suggest?
(1) Ineffective water pump (2) Clogged radiator (3) A clogged water hose
Which of the following would make the engine difficult to start?
(1) No water in the radiator (2) The coil is hot (3) The compression is poor (4) No oil in the crankcase
What can cause overheating
(1) Poor water circulation (2) binding brakes (3) broken fan belt or clogged radiator
What are the most likely causes of overheating?
(1) Poor water circulation (2) Binding brakes (3) Broken fan belt (4) Ignition sparks too retarded
What safety precautions should be taken when jacking up a vehicle?
(1) Scotch the wheels (2) Remove the occupants from the vehicle
Why is it unsafe to fill a radiator while the engine is very hot?
(1) The water my boil and blow back in your face (2) The sudden change in temperature may crack the cylinder head.
What is the use of the clutch?
(1) To engage the engine to the gear box (2)To disengage the engine from the gear box
How do the engine's pistons move?
(1) Up and Down. (2) In and Out
If an engine does not run smoothly at high speed, what could be the cause?
(1) Valve springs weak (2) Faulty ignition
If the engine will not run smoothly at slow speed, what could be the cause?
(1) Valves not properly seated (2) Carburetor needs adjusting (3) Incorrect tappet adjustments
What can cause flooding in the carburetor?
(1)Float stuck in down position (2)Foat is too heavy (3)Needle valve stuck in open position
What is the generator usually driven by?
A belt
Which of the following could be fitted on a diesel engine?
A de-compressor valve
If current is going to the distributor points but not to the spark plugs, what could be the fault?
A defective rotor arm
If you are driving along and a rumbling noise develops in a front wheel, what would you suspect?
A defective wheel bearing
What would a choke in a. petrol line indicate?
A dirty petrol tank
If you are driving steadily along and your vehicle stops suddenly, what would be a possible cause?
A disconnected coil wire
What would indicate the need for new brake linings?
A drop in the height of the brake pedals
If the brake pedal pressure is lost, what could this indicate?
A faulty washer
If a fan belt is adjusted too tightly, what could this cause?
A generator bearing being worn too excessively
What causes the necessity to keep topping up the master cylinder?
A leak in the brake line or tube
If you observe oil continually appearing in the radiator, what would you suspect?
A leaking cylinder gasket
What are tools commonly used for adjusting the distributor points?
A screwdriver and a feeler gauge
Give one indication of a faulty gear box?
Abnormal noise coming from the gear box
Where are the water jackets located?
Around the cylinders
At what point is a spark time do ignite the mixture of petrol an air?
At the top of the stroke
If there is a spark from the coil but not from the spark plugs, what would this indicate?
Bad rotor brush
How are the valves positioned in a four-stroke cylinder engine on the compression stroke?
Both valves are closed
How is power obtained in a four stroke petrol engine?
By expansion caused by combustion
How is the bleeding of the brake system accomplished?
By expelling air from the system
How is effective braking in a hydraulic system obtained
By maintaining fluid levels in the reservoir
In what way can a simple test for compression be obtained?
By removing the plugs one at at time and stopping the opening with a finger while the engine is revolving.
How is effective lubrication maintained in a four stroke engine?
By the oil pump
What is the most effective way to clean a carburetor
By using a solvent
What is the main cause of damage to a manual gear box?
Changing gear without using the clutch
What is usually meant by serving the gear box?
Checking the oil level
Give one reason for a Diesel engine failing to start?
Decompressor valve open
If your tail pipe is blocked with earth, which of the following effects would this have on the engine?
Failing to start
What can cause your engine to misfire?
Faulty spark plugs
At what point is petrol mixed with air before being drawn into the engine?
IN the Venturi
Where is the condenser usually located?
Inside the distributor
What does spitting back through the intake suggest?
Intake valves not properly seated
If there is evidence of water in the carburetor, what effect will this have on the engine?
It would cause the engine to sputter
If after driving for some time the red trouble light appears on the dashboard, what should you do?
Look for a loose or broken fan belt or check if the generator wire is disconnected
What is an indication of a dirty air cleaner?
Loss of power
Where are brake shoe adjustments usually located?
On the backing plate.
When an engine is said to be "missing" what does this mean?
One of the cylinders is faulty
What could cause blue smoke to come from a tail pipe?
Over-flooding
What could be the cause of fumes coming into your car?
Poor engine condition
If the green light on the dashboard appears when you are driving at 30 m.p.h.. what could be the cause?
Poor oil circulation in the engine
Which of the following are the strokes of the engine?
Power and Combustion
What makes in necessary to bleed brakes?
Replacement of old brake cylinders
If you are driving a diesel truck up a hill and the vehicle stalls in low gear, what should you do?
Select reverse gear
If you have just driven through deep water and your engine begins to misfire, what do you suspect?
Shorting out of the plugs and the coil
How many wires are attatched to the distributor of a four cylinder engine?
Six wires
What closes the valves of a four stroke single cylinder petrol engine?
Springs
If you depress the hydraulic pedal four times in quick succession and it hits the floor board each time, what would you suspect?
That the brakes require bleeding
What is the air cleaner fitted to?
The Air Intake
What can be used to alter the "mixture" or ratio of petrol to air?
The air screw
What drives a mechanical fuel pump?
The camshaft
What would you suspect if you noticed thick black smoke coming from the exhaust of your engine?
The carburetor requires adjustment
What changes the movements of the pistons to rotary motion?
The crankshaft
Which is correct?
The crankshaft drives the camshaft
If you were driving along at 40 m.p.h. and a battery wire became disconnected, what would happen?
The dashboard light would appear
If the carburetor has a leaking base gasket, what would this cause?
The engine to idle too fast
If either is a leak in the crankcase a two stroke engine, what effect would this have on the engine?
The engine would be difficult to start
If an airlock developed in the fuel system of a diesel engine, what would be the result?
The engine would shut down
What creates momentum a four stroke petrol engine?
The flywheel
If you find that the rear wheels only are binding, what would be the cause?
The hand brake is on
What happens when the generator stops charging?
The ignition light burns red
If the vehicle wings to the right when the brake is applied, what could be the fault?
The left brake lining is wet
When black smoke is being emitted from a tailpipe what does this indicate?
The mixture is too rich
What opens the valves on the compressor stroke of a four stroke single cylinder petrol engine?
The rocker arms
What would the effect be if the tailpipe became blocked
There would be loss of power
If there is evidence of water in your crank case, how would the oil appear to you?
Thick and frothy
What is the primary purpose of the valves in an engine?
To allow "mixture" to enter and leave the combustion chamber
What is the use of the rotor brush?
To deliver current to the spark plugs
What is the use of the screwdriver
To drive a screw
Why should valves be properly seated?
To ensure good compression
Why is the hand brake primarily fitted to a car?
To form one of the two braking systems required by law
What is the prime function of the gear box?
To maintain engine revolutions
What is the prime use of the carburetor?
To mix petrol with air
What is the main purpose of the condenser ?
To prevent burning of the points
What is the use of the generator?
To provide an electrical charge
What si the use of the ignition coil?
To provide high tension wire
What is the use of the voltage regulator?
To regulate the charge of the generator or alternator
What is the use of a lug spanner?
To remove lug nuts and bolts
In which of the following is a pair of pliers used?
To remove split pins
Where is the cloth pedal located?
To the left of the brake pedal
If you attempt to select a lower gear while driving downhill and you miss, what is the safest thing to do?
Try to select a higher gear
How many valves are there in a single cylinder engine?
Two valves
Is the generator output...
Variable according to battery condition
If the vehicle swings to one side when the brake pedal is depressed, what could be the cause?
Wet brake lining
When is a tyre defective?
When it is wore to or beyond the breaker strip
How do you know when the generator is charging properly?
When the red indicator light goes off
How many wires are attached to the distributor cap of a four stroke engine
five wires