ASE Diesel Practice Test All Possible Questions and Answers with complete solution

When a diesel engine is operated under a load, coolant continually comes out of the radiator overflow and there are bubbles in the radiator. Which of these is the most likely cause? (A) Too much coolant in the cooling system (B) A clogged radiator (C) A stuck-open thermostat (D) Compression leakage into the cooling system - Answer-D A diesel engine has excessive black smoke when started in the morning. Which of these could be the cause? (A) A bad fuel injection nozzle (B) A restricted fuel filter (C) A blocked fuel tank vent (D) A leaking fuel return line - Answer-A Which of these can cause a no-start condition on a HEUI engine? (A) High fuel pressure (B) Low injection control pressure (C) High boost pressure (D) Low boost pressure - Answer-B A diesel engine is hard to start, but runs good after it has been primed and run for a few minutes. The most likely cause is a: (A) leaking injector line. (B) leaking fuel return line. (C) plugged fuel tank vent. (D) bad transfer pump check valve. - Answer-D