Mechanic Sample Exam D

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84. A four-stroke small engine will not start and appears to flood easily, the most like cause of this is:

A. The choke is stuck open.

B. The choke is stuck closed.

C. The fuel tank is empty.

D. The ignition voltage is too high.

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85. A two-stroke small engine will not start, the easiest item to check first when troubleshooting is:

A. The carburetor adjustment.

B. The engine compression.

C. The condition of the spark plug.

D. The breaker point gap.

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86. Carburetor design is based on the:

A. Law of motion.

B. Law of gravity.

C. Venturi effect.

D. Hall effect.

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87. True or False. Caution should be used when working on Hybrid vehicles because they employ a high voltage battery system.

True

False

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88. Using the following AWS classification of E6010 for carbon and low carbon alloy steel-covered electrodes, what does the number 60 indicate to the welder:

A. The welding current.

B. The minimum tensile strength.

C. The welding position.

D. The type of shielding gas.

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89. The function of the flux covering on the shielded metal arc (SMA) welding electrodes is:

A. To provide a shielding gas.

B. To serve as an insulator.

C. To provide a slag cover to protect the weld bead and slow cooling rate.

D. All of the above.

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90. Which shielded metal arc (SMA) welding electrode will provide the greatest penetration into the base metal being welded:

A. E6011

B. E6013

C. E7014

D. E7024

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91. True or False. The maximum thickness a properly set-up oxygen-acetylene torch can cut through is 3 inches.

A. True

B. False

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92. True or False. Wearing of synthetic clothing (Nylon, rayon, and polyester) will provide better protection against burns than cotton or wool.

A. True

B. False

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93. True or False. Shielded metal arc welding (Arc/stick welding) can cause burns to the skin if left unprotected, due to ultraviolet radiation.

A. True

B. False

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94. True or False. Welding fumes are safe to breathe.

A. True

B. False

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95. True or False. If an oxygen tank is knocked over and the valve at the top of the tank is broken completely off, the tank poses no danger.

A. True

B. False

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96. Flash burn (aka Welder’s Burn) affects what part of the body:

A. The skin

B. The ears

C. The nose

D. The eyes

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97. All of the following can reduce turbocharger life EXCEPT:

A. Inadequate cooling

B. Lack of oil changes

C. Lack of air cleaner maintenance

D. Exhaust system damage

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98. While performing a cylinder leakage test air is heard escaping at the oil fill, what is causing this problem:

A. Leaky exhaust valve

B. Leaky intake valve

C. Ring or cylinder wear

D. Bad head gasket

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99. While performing a cylinder leakage test air bubbles are seen at the radiator fill, what is causing this problem:

A. Leaky exhaust valve

B. Leaky intake valve

C. Ring or cylinder wear

D. Bad head gasket

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100. When performing a cylinder leakage test, the piston must be:

A. Removed

B. Wedged

C. Soaked in oil

D. At top dead center

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101. When using an ammeter, it is connected to the circuit in:

A. Parallel

B. Series

C. Series-Parallel

D. None of the above

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102. The MOST likely symptom of an exhaust gas recirculation (EGR) valve that is stuck closed at engine idle is:

A. Normal engine performance.

B. A hesitation.

C. A rough idle.

D. Detonation.

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103. While discussing engine performance diagnosis, Technician A says a vacuum leak decreases engine performance. Technician B says propane is the best method of locating vacuum leaks. Who is right?

A. A only

B. B only

C. Both A and B

Option 4

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104. The LEAST likely problem resulting from an accelerator pump out of adjustment is:

A. Hesitation

B. Stumble on acceleration

C. Lean misfire at cruise speeds

D. Excess fuel consumption

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105. A cylinder power balance test can indicate all of the following problems EXCEPT:

A. A bad spark plug

B. Late ignition timing

C. An open ignition wire

D. Burned valves

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106. Technician A says if the exhaust gas recirculation (EGR) valve remains slightly open at idle, the idle will be rough. Technician B says if the EGR valve does not open, excessive combustion temperatures may cause detonation under load.

A. A only

B. B only

C. Both A and B

D. Neither A nor B

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107. The LEAST likely cause of low cylinder compression is:

A. Worn valves

B. Worn rings

C. Blown head gasket

D. Worn valve guides

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108. All of the following symptoms are true of low fuel pressure EXCEPT:

A. Excessive sulfur smell

B. Lack of power

C. Engine surging

D. Limited top speed

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109. True or False. Engine vacuum decreases under heavy acceleration.

A. True

B. False

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110. The first symptom of a restricted air filter is:

A. Poor fuel economy

B. A no-start condition

C. Excessive engine wear

D. Excessive oil consumption

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111. A current measurement should only be taken when:

A. The circuit has power

B. The circuit is disconnected from power

C. The circuit is shorted

D. The circuit is open

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112. A resistance measurement should only be taken when:

A. The circuit has power

B. The circuit is disconnected from power

C. The circuit is shorted

D. The circuit is open

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113. True or False. Current under 0.5 Amps can be fatal.

A. True

B. False

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