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