Postal Automotive Technician Exam 944

What often causes hard starting?

Improper choke operation

The Purpose of a Turbocharger is to

Increase engine power by forcing more air into the combustion chamber

False Statement about Flywheel

Joined to the Camshaft

Most Small Gas Engines Use a _________ Ignition System

Magneto

The service ratings MS, SE, SG refers to

Motor Oils

The Main Component of an Exhaust System is the

Muffler, which reduces noise produced by the engine

The correct order of piston rings above the piston pin is

Oil - oil - compression - compression

Icing Occurs Most Often

On Cool Damp Days

The voltage in the secondary of the ignition coil may reach

20,000 volts

The speed necessary to escape gravitational pull of the earth is

25,000 miles per hour

Importance of Radiator Fan

During Idling

Most Accurate Engine Timing Setting Tool

Dwell Meter

What will leaking intake valve guides cause?

Excessive oil consumption

Disc Brakes on a Car Have a Distinct Advantage Over Conventional Drum Brakes in That They

Fade Less When Hot

Turn ignition point I generally the result of a

Faulty condenser

28. Float Bowl Fuel Level Maintenance Circuit

Float Circuit

Power impulses from the engine are smoothed out by the

Flywheel

Gasoline cannot be used in a diesel because

Gasoline will start to burn before the piston reaches the top of the stroke

A Restriction in the Exhaust System is Indicated on a Vacuum Gauge by a

Gradual Decrease in Reading

In a Diesel Engine, the Fuel is Ignited by the

Heat of Compression

The most reliable method of testing a storage battery is by using a

Hi rate discharge cell tester

The Purpose of an Oil Filter in a Car is to

Remove contaminants and debris from the engine oil to prevent engine damage

23. Two Cycle Engine Power Stroke Frequency

Revolution

22. Purpose of Welch Plugs

Sand Removal After Casting

Rocket Designed for Space Travel

Saturn Rocket

If generator output is excessive even after disconnecting the F Terminal, where might the trouble be?

The generator

What is the maximum allowable oversize amount when reconditioning brake drums?

.060 inches

A generator should be polarized to prevent damage whenever

The generator or regulator wires have been disconnected

The idle and low-speed circuit in a carburetor is inoperative

At speeds over 20 mph

On many cars, what is the fuel pump combined with?

Vacuum pump

21. Intake Stroke Air Fuel Mixture Measurement

Volumetric Efficiency

30. Regenerative Gas Turbine Engine Application

Automobiles

The Function of the Float in a Carburetor is to

Close the Needle Valve

In a normal operating engine, the vacuum gauge will read

8-11

What generally causes flooding of a carburetor?

A stuck float needle valve

On the compression stroke, a diesel engine compresses

Air

26. Closed Crank Case Ventilation System Purpose

Air Contamination Prevention

29. Jet Engine Combustion Chamber Liner Cooling

Air Streams

Cause of Soft Brake

Air in the Lines

A storage battery becomes so faded when

Batteries are discharged

Optimal Spark Plug Firing Time for Maximum Power

Before Top Dead Center

How does an automobile alternator convert alternating current to direct current?

By means of silicon diodes

The fuel pump is actuated by

Camshaft

24. Preignition Cause

Carbon Deposits

Main Difference Between Rockets and Jet Engines

Carry Own Oxygen

The Role of a Camshaft in an Engine is to

Control the opening and closing of the engine's valves

The Vibration Damper on an Auto Engine is Fastened to the

Crankshaft

25. Outdoor Motor Propeller Size Units

Diameter and Pitch

The intake and exhaust openings on a two-stroke cycle engine are known as

Ports

All of the following have moving parts, except the

Ram jet engine

The Function of a Thermostat in an Engine is to

Regulate the engine temperature by controlling the flow of coolant

Turboprop engine is more efficient than turbojet engines for aircraft flying

Short trips

If an engine is operating at part throttle for long periods, what will happen to the spark plugs?

Spark plugs will become covered with carbon

To Improve Stability When Cornering, Manufacturers Added a Device to Cars Called

Stabilizer Bar

Engine Timing is Generally Set by Using a

Strobe Light

A blower or pump which forces air into cylinders at higher than atmospheric pressure is known as

Supercharger

Ball joint type front suspension eliminates

The conventional kingpin

Control of Towing by Adjusting

Tie Rod

Adjustment of the Rods on a Car Will Affect

Toe-in

A car with a history of burned points would likely indicate what problem with the voltage regulator?

Too high setting

What does carbon fouling of a spark plug indicate?

Too rich a mixture

The most common cause for excess tire wear on edges is

Underinflation

Normal Spark Plug Electrode Color

White to Yellow

Cam Angle Adjustment in Distributors

With Cap Left On

27. Angular Motion around Vertical Axis

Yaw