ASE A1 Engine Repair Practice Test

46.

Digital micrometer reading

The reading on the micrometer indicates:

  • A. 6.05 mm
  • B. 6.00 mm
  • C. 5.50 mm
  • D. 6.50 mm

46.

Digital micrometer reading

Answer A is wrong. The micrometers reading is not 6.05 it is 6.50mm.

Answer B is wrong. The micrometers reading is not 6.00 it is 6.50mm.

Answer C is wrong. The micrometers reading is not 5.50 it is 6.50mm.

Answer D is correct. The micrometers reading is 6.50 mm.

47. A technician is checking for piston ring groove clearance. The proper technique includes.

  • A. The old ring and a feeler gauge.
  • B. The new ring and a feeler gauge.
  • C. Only a feeler gauge.
  • D. No feeler gauge is required.

47.

Answer A is wrong. Technician B is correct.

Answer B is correct. Clean the pistons in a cold tank and then 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.

48. A cylinder power balance test is being performed on a vehicle with sequential fuel injection. The number five cylinder's rpm drop is less than all of the others. Technician A says this could be the result of a restriction in the fuel injector. Technician B says this could be caused by leaking secondary insulation. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

48.

Answer A is wrong. Both technicians are correct.

Answer B is wrong. Both technicians are correct.

Answer C is correct. Both restricted fuel injectors and leaking secondary wires will reduce the cylinder's contribution. Anything that would have an affect on the cylinder's power. It could be mechanical like a faulty valve, possibly the ignition, or the fuel mixture affecting this cylinder's power output.

Answer D is wrong. Both technicians are correct.

49. A turbocharger wastegate is sticking. Technician A says a stuck open wastegate will result in overboost. Technician B says a stuck closed wastegate will result in an underboost condition. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

49.

Answer A is wrong. Neither technician is correct. It’s backwards, a stuck open wastegate (P0299) results in poor performance and a lack of horsepower because the exhaust pressure is bypassing the turbine wheel.

Answer B is wrong. A stuck closed wastegate produces overboost. Overboost results in detonation from the excessive cylinder pressure.

Answer C is wrong. Neither technician is correct.

Answer D is correct. Neither technician is correct.

50. An engine has excessive crankshaft endplay. Which of the following is MOST likely causing this condition?

  • A. Camshaft bearings
  • B. Thrust bearings
  • C. Crankshaft main bearings
  • D. Rod bearings

50.

Answer A is wrong. Thrust bearings locate and keep the crankshaft from moving foreword and backward in the engine block.

Answer B is correct. The thickness of the thrust bearing indicates crankshaft endplay.

Answer C is wrong. Answer B is correct.

Answer D is wrong. Answer B is correct.