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MTA BUS MAINTAINER CHASSIS
Exam Questions with 100% Verified
Answers Latest Versions 2025 Graded
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Which type of electric starting motor is often used because of its high starting torque? A. Compound - wound B. Shunt - wound C. Series - wound D. Capacitor correct answers C. Series - wound
The auto system that is LEAST likely to cause engine operating problems is the system. A. starting B. charging C. ignition D. fuel injection correct answers D. fuel injection
Which device is capable of measuring volts , ohms , and amperes in solid - state electronic equipment? A. Digital multimeter B. Analog multimeter C. Jumper wires D. Continuity tester correct answers A. Digital multimeter
Which of the following is a PROBABLE cause of backfiring in an intake manifold? A. Broken connecting rod B. Incorrect valve timing C. Sticky choke valve D. A lean cold - engine fuel mixture correct answers D. A lean cold - engine fuel mixture
An EGO sensor that is used in a microprocessor - based control / diagnostic system should NOT be used for control at a temperature less than , ______° C. A. 0 B. 100 C. 200 D. 300 correct answers D. 300
What is the PROBABLE result of setting a spark plug gap more closely than normal? A. Smoother idling B. Hard starting C. Easier starting D. Rougher idling correct answers D. Rougher idling
Adjusting the ____will help the steering of a car return to a straight position after cor nering. A. toe - in B. toe - out C. caster D. camber correct answers B. toe - out
A. readily found using standard service bay equipment B. accomplished by displaying fault codes to the driver at the time C. sometimes accomplished by means of warning lamps on the dash D. routinely accomplished with the onboard diagnostic capability correct answers C. sometimes accomplished by means of warning lamps on the dash
- Before disassembling an air - release parking brake , it is necessary A. remove the diaphragm clamp B. remove the quick release valve C. compress the apply spring D. fill the air reservoir correct answers C. compress the apply spring
What is the MOST probable result of incorrect camber on car wheels A. Abnormal tire wear along one side of the tread B. Damaged shocks C. Front - end shimmy D. Pulling to the side while braking correct answers A. Abnormal tire wear along one side of the tread .
What is the MAIN advantage associated with the use of offboard computer diagnostic systems? A. Decreased task load B. Continuous testing intervals C. Can be manually activated by the driver D. Capable of simultaneous multiple diagnoses correct answers A. Decreased task load
An EGO sensor used in a microprocessor - based control / diagnostic system A. is perfectly linear
B. is unaffected by temperature C. has two different output levels , depending on the fuel mixture D. is unaffected by engine exhaust levels correct answers C. has two different output levels , depending on the fuel mixture
To what drive train component is the ring gear in the differential bolted? A. Drive pinion B. Axle shaft C. Differential case D. Carrier correct answers C. Differential case
What is transmitted by the slip rings on an automotive alternator? A. Alternating current to the field coils B. Alternating current from the stator windings C. Direct current from the field coils D. Direct current to the alternator output terminals correct answers C. Direct current from the field coils
In order for an onboard computer diagnostic system to detect a failure in the car's electronic system , the failure must be A. associated with engine performance B. intermittent C. symptomatic D. nonreversible correct answers D. nonreversible
- Which of the following is a PROBABLE cause of an engine's missing at low speed? A. Poor compression B. Leaky head gasket C. Carbon deposits in cylinders
D. Potentiometer correct answers B. Ohmmeter
- Which device is used to measure the resistance of a circuit or electrical machine A. Ohmmeter B. Voltmeter C. Resistor D. Ammeter correct answers A. Ohmmeter
- What reading will appear on an infrared meter which indicates a failure of converter ?____HC / ____CO. A. Low ; high B. Low ; low C. High ; low D. High ; high correct answers C. High ; low
- In automatic transmissions , the servo A. operates the shifter valves B. applies the clutch C. applies the bands D. controls the output from the variable vane pump correct answers C. applies the bands
- If an onboard diagnostic system's fault code indicates that the O₂ sensor is not ready , all of the following are possible causes EXCEPT A. O₂ sensor is not functioning correctly B. defective connections or leads C. lack of O₂ contacting sensor D. control unit is not processing O₂ signal correct answers C. lack of O₂ contacting sensor
- The mechanical compressor in a car's air conditioning system is driven by A. an electric motor B. the axles C. the propeller shaft
D. the crankshaft correct answers D. the crankshaft
All of the following are probable sources of drivability problems EXCEPT the A. battery system B. engine condition C. ignition system D. fuel delivery system correct answers A. battery system
Bending the______ is the BEST way to adjust the ignition point contact. A. movable point arm B. breaker plate C. stationary point bracket D. pivot post correct answers C. stationary point bracket
If an ignition system's breaker points are pitted , what should a mechanic check FIRST? A. Distributor condenser B. Distributor cap C. Circuit breaker D. Coil correct answers A. Distributor condenser
Which cooling system component should be checked if a car's air conditioning blower operates properly but system output is still inadequate? A. Receiver - drier B. Evaporator core C. Temperature control
Which of the following is NOT a type of temperature sensor used in microprocessor based control / diagnostic systems? A. Wire - wound resistor B. Potentiometer C. Semiconductor resistor D. Thermistor correct answers B. Potentiometer
The various relationships and fundamental data associated with the use of an expert diagnostic system are known as the A. domain. B. inference engine C. knowledge base D. interface. correct answers C. knowledge base
When checking a circuit for voltage drop , which of the following steps should be per formed LAST? A. Select the voltmeter range just above the battery circuit B. Connect the positive lead of the voltmeter to the end of the wire closest to the battery C. Connect the negative lead of the voltmeter to the end of the wire farthest from th battery D. Switch on the circuit correct answers D. Switch on the circuit All of the following are probable causes of an engine's failure to start EXCEPT A. cylinders not wired in proper order B. poor coolant circulation C. resistance unit burned out D. defective condenser correct answers B. poor coolant circulation 2 2.
In an expert system for offboard computer diagnosis , which stage of knowledge acquisi tion in developing problem - solving rules occurs FIRST? A. Implementation B. Identification C. Formalization D. Conceptualization correct answers B. Identification 2 3. Some suspension units consist of tandem axles joined by a single cross support that also acts as a vertical pivot for the entire unit. These units are known as A. axials B. field frames C. bogies D. helicals correct answers C. bogies 2 4. In automotive electronics , the fractional duration that ignition points are closed is known as A. slip B. gain C. dwell D. delay correct answers C. dwell 2 5. A brake system's warning lights may be tested by A. testing the bulbs with an ohmmeter B. depressing the brake pedal and opening a wheel cylinder bleeder screw C. jumping the wires at the brake distributor switch assembly D. testing the system with an ammeter correct answers B. depressing the brake pedal and opening a wheel cylinder bleeder screw 2 6. Of the following procedures performed prior to grinding a valve seat , which should be performed FIRST?
