Question 67Motor Plants - Assistant Engineer70% to pass
The 3-position, 4-way directional control valve with a 30 bar output at "ee" as shown in the illustration (MO-0116) is a blocking valve associated with the engine turning gear. Which of the following statements describes its function when incorporated into a slow-speed diesel engine starting control air distributor as shown in the illustration (MO-0053)? Illustrations MO-0053 and MO-0116
AI Explanation
The correct answer is C) The blocking valve is used to interrupt the control air at port "A" when the turning gear is engaged.
The blocking valve is a 3-position, 4-way directional control valve that is used to control the flow of air in the slow-speed diesel engine starting control air distributor. When the turning gear is engaged, the blocking valve interrupts the control air at port "A", preventing the engine from being started. This is a safety feature to prevent the engine from being started while the turning gear is engaged, which could cause damage to the engine.
The other answer choices are incorrect because they do not accurately describe the function of the blocking valve in this system. Option A is incorrect because the blocking valve interrupts the control air, not the supply air. Option B is incorrect because the blocking valve interrupts the control air when the turning gear is engaged, not disengaged. Option D is incorrect because the blocking valve interrupts the control air, not the supply air.
Related Questions
#65 Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor? #66 The pneumatic circuit shown in the illustration is part of a control system used with large low-speed diesel engines. The arrangement may be used to control_______________. Illustration MO-0118 #68 Which of the following statements describes the operation of the circuit shown in the illustration? Illustration MO-0114 #69 The device represented by the symbol "B" in the illustration is used to_______________. Illustration MO-0115 #70 Which of the types of reduction gearing listed is best suited for medium-speed main propulsion units?