A dark exhaust from a running diesel engine can be caused by （）

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• The color of the exhaust from a diesel engine should be （）

  A . clear B . hazy light brown C . hazy light blue D . hazy light grey

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• On my left（）a wide river; on my right, a dark forest.

  A . has been B . was C . are D . would be

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• On a clear，warm day，you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead（）.

  A . it will be preceded by a sudden increase in wind speed B . it will be preceded by a sudden decrease in wind speed C . the wind speed will not change as it passes D . the wind will back rapidly to left in a counterclockwise direction as it passe

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• White smoke exhausting from a diesel engine can be caused by （）

  A . low combustion temperature B . a leaking fuel nozzle check valve C . late fuel injection D . plugged oil-scraper ring hole

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• A patient suffering from heat exhaustion should be（）.

  A . moved to a cool room and told to lie down B . kept standing and encouraged to walk slowly and continuously C . given a glass of water and told to return to work after 15 minutes of rest D . None of the above are correct

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• High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

  A . decreased piston to cylinder head clearance B . increased exhaust system back pressure C . early fuel injection timing D . low scavenge air temperature

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• A smoking exhaust from an operating diesel engine could be caused by （）

  A . low sulfur content in the fuel B . a loose injector inlet connection C . late fuel injection D . high injection pressure

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• Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）

  A . natural aspiration B . masked intake valves C . air cells D . scavenging air

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• （）is a caing used for exhaust pipe from the engines.

  A . The funnel B . The messroom C . The galley D . The satellite antenna

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• The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）

  A . pumping action of the piston B . pressure of the fuel charge C . vacuum developed in the manifold D . pressure of the fresh air charge

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• An attacker is launching a DoS attack on the Company network using a hacking tool designed to  exhaust the IP address space available from the DHCP servers for a period of time.  Which  procedure would best defend against this type of attack？ （）

  A .  Configure only trusted interfaces with root guard. B .  Implement private VLANs （PVLANs） to carry only user traffic. C .  Implement private VLANs （PVLANs） to carry only DHCP traffic. D .  Configure only untrusted interfaces with root guard. E .  Configure DHCP spoofing on all ports that connect untrusted clients. F .  Configure DHCP snooping only on ports that connect trusted DHCP servers. G .  None of the other alternatives apply

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• High exhaust temperatures from all of cylinder of a turbocharged, four-stroke/cycle diesel engine can be caused by an（）

  A . inoperative turbocharger B . inadequate fuel supply C . overload on one cylinder D . unequal load distributio

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• A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) nor (2)

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• A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）

  A . increasing the linear velocity of the exhaust gases B . changing directions of exhaust gas flow C . decreasing the temperature of the exhaust gases D . accelerating the exhaust gas through a reduced size orifice

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• A lube oil sample taken from the main engine lube oil system has dark yellow opaque color.This is the result of （）

  A . water contamination B . mixing oils of two widely different viscosities C . overheating D . aeratio

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• Black smoke exhausting from a diesel engine indicates（）

  A . proper fuel injection B . water in the fuel C . incomplete combustion D . burning of lube oil

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• A diesel engine emits blue exhaust smoke as a result of（）

  A . cold intake air B . excessive compression pressure C . excessive cylinder lubrication D . a light load

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• A built-up exhaust valve is one in which （）.

  A . the stem and heads are made of different material B . low-alloy steel is used throughout C . a replaceable valve disk is welded to the head D . the self-centering action comes from motion of the valve stem in the guide

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• In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）

  A . exhaust manifold B . valve bridge C . pressure of the fresh air charge D . valve adjusting gear

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• A tiny star can in the darkness.

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• The idiom a dark horse is a___.

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• A dark suit is to a light one for evening wear.

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• We walked slowly down the trail with great trepidation. No one who had gone this way had ever been heard from again. Had they simply found a better place to settle on this dark planet？ We doubted that

  A．movement B．worry C．enjoyment D．laughter

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• All shades of red, from a golden___ （bright red） to a rich crimson, glowed and met his eyes under a darkness of leaves（）

  A．vermilion B．dark red C．dull red D．deep red

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