26.

Answer A is wrong. Both technicians are correct.

Answer B is wrong. Both technicians are correct.

Answer C is correct. A stuck closed EGR valve will cause ping (detonation) while a stuck open valve will cause an engine to stumble and stall.

Answer D is wrong. Both technicians are correct.

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27.

Answer A is wrong. Technician B is correct.

Answer B is correct. Clean the pistons in a cold tank and clean the grooves with a ring groove cleaner before measuring.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

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28.

Answer A is correct. This type of fan operates with a silicon type fluid not electricity. A loss of fluid will inhibit the fans operation.

Answer B is wrong. Technician A is correct. Relays are used in electric fan circuits.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

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29.

Answer A is wrong. Technician B is correct.

Answer B is correct. Each time the piston moves downward pressure is increased in the crankcase. This pressure is vented into the intake using the PCV system.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

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30.

Answer A is wrong.

Answer B is wrong.

Answer C is wrong.

Answer D is correct. Excessive fuel is burning in the catalytic converter causing the sulfur odor.

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