[单选题]The most practical way of detecting an overload in one cylinder of an operating large, low-speed, main propulsion diesel engine is to _____________.
[单选题]Fuel injector nozzles are usually of the multi-orifice type with the number and placement of the holes arranged according to the ______.
[单选题]_____ speed trial, when analyzed, can give valuable data, not only for the ship tested, but also for future ship design and for comparison with other ships and tank experimental results.
[问答题]Valve drive mechanism The valve drive mechanism commands the inlet and exhaust valves at the required timing. The valve drive mechanism consists of an inlet and exhaust cam follower (8) each suspended in a plunger of the tappet assembly (7), two tubular push rods (4) with ball joints, two nodular cast iron rocker arms (2) suspended in a rocker arm bearing bracket, two yokes (5) and a yoke guide pins. See Fig. 4-1. The tappet rollers follow the cam profiles and transfer the movements through push rods to the rocker arms. The rocker arms operate the inlet and exhaust valves through yokes (5).Lubrication for the rocker arms comes from the engine’s secondary oil supply manifold through drillings in the cylinder head and rocker arm bracket. The tappet assembly receives lubricating oil via channels in the engine block from the main supply manifold. For the roller and shaft, the oil is supplied through the guiding plunger. To compensate for heat expansion a clearance must exist between the rocker arm and yoke. All adjustments have to be done on a cold engine only.
[单选题]The cylinder pressure data is presented as easy-to-interpret measurement _____ on the PC as well as in tabular form.
[单选题]A direct current passing through a wire coiled around a soft iron core is the description of a simple ____.
[单选题]The meat box temperature control circuit, as used in the ship service refrigeration system, is an example of _________.
[问答题]In one type of large bore MC engines with high cylinder numbers, we have experienced longitudinal vibrations of exhaust receiver of a magnitude that caused local overstressing around the fixed supports. Measurements revealed that the vibrations were caused by gas pulsation inside the receiver at a frequency, which, at certain engine speeds, coincided with the natural frequency of the mechanical vibrations of the receiver. The problems were solved by redesigning the receiver and its supports, so as to change the natural frequency. The fixed support for the exhaust receiver was modified from our single spring plate type to a double spring plate type. The double spring plate type reduces the local deformation of the receiver and because of the greater rigidity, also the natural frequency of the support is increased.
[单选题]If the first engineer asks you to wait on the deck for engine stores, what should you do first of all?
[单选题]In an automatic mooring winches, the wire is paid off the barrel at a ______tension and is recovered at tension.
[单选题]When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be ____.
[单选题]Most troubles likely to occur with marine diesel engine can, if located in time, be remedied with no difficulty and many can be______if engine is maintained with a high sense of responsibility to the people on the part of the motormen and engineers.