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
