-
Failure of fuel injection is usually due to trouble in the （）.
A . exhaust valves
B . mechanical lubricators
C . cooling water pumps
D . fuel injection pum
-
If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）
A . backfire through the air intakes
B . develop less power under load
C . have high firing pressures
D . lift its cylinder relief valve
-
The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.
A . metering
B . timing
C . rate of injection
D . rate of distributio
-
When fuel is injected late into a diesel engine cylinder,（）.
A . the exhaust will be clear
B . fuel consumption will be low
C . all the fuel will be burned at top dead center
D . fuel consumption will be high
-
Either a low injection pressure or a leakage of piston rings is able to lead （）.
A . a high exhaust temperature
B . a high smoky exhaust
C . a high output
D . a high compressio
-
In a diesel engine, when the fuel is injected into the cylinder,（）
A . the piston is just coming upward from the bottom dead center
B . the piston has moved about one-fifth of the way up
C . the piston has moved most of the way up and almost reached the TDC
D . the piston has just past the TDC
-
Late fuel injection timing is indicated by （）
A . lower than normal cylinder pressure and low exhaust temperature
B . lower than normal cylinder pressure and high exhaust temperature
C . higher than normal cylinder pressure and low exhaust temperature
D . higher than normal cylinder pressure and high exhaust temperature
-
It is important to note that the injection only takes place when the plunger is moving up the cam （）.
A . base circle
B . slope
C . bottom point
D . top point
-
In a common rail engine, the fuel is injected into cylinders（）
A . by injection pumps
B . at a time decided by the injection pump timing
C . by a signal opening the magnetic valves
D . at a time decided by the cam directly
-
Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.
A . BHP
B . MCR
C . IHP
D . MEP
-
The sequence of fuel injection into cylinders is determined by （）.
A . the steering
B . the driven gear
C . the turning gear
D . the timing gear
-
An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）
A . advance as the load increases
B . retard as the load increase
C . remain unchanged regardless
D . always occur at top dead center
-
The major cause of fuel pump and injection system problems is （）
A . improper adjustments
B . contaminated fuel
C . kinked fuel lines
D . excessive engine vibratio
-
Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）
A . a combination of constant volume and constant pressure
B . a combination of constant temperature and constant pressure
C . entirely constant pressure
D . entirely constant volume
-
Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.
A . spark plugs
B . glow plugs
C . heat of compression
D . a magneto
-
The emergency bilge suction or bilge injection valve is used to prevent （） of the ship.
A . proceeding
B . overloading
C . collision
D . flooding
-
The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）
A . the firing pressure in the cylinder
B . a metering helix inside the pump
C . varying the physical length of the plunger stroke
D . varying the clearance between the injector cam and the injector rocker arm
-
Early fuel injection timing is indicated by the cylinder pressure being（）
A . above normal with a below normal exhaust temperature
B . above normal with a normal exhaust temperature
C . below normal with a normal exhaust temperature
D . below normal with an above normal exhaust temperature
-
Late fuel injection in a diesel engine is indicated by low firing pressure with（）
A . high exhaust temperature
B . low exhaust temperature
C . fuel knock in each cylinder
D . mechanical knock in each cylinder
-
Blood is a fluid consisting of plasma which accounts for less than 1%.
-
Which of the following conditions is most likely to produce an elevated plasma potassium?
A、 Hypoparathyroidism
B、 Cushing’s syndrome
C、 Diarrhea
D、 Digitalis overdose
-
Which is the best explanation of the relationship between lymph, blood plasma, and interstitial fluid？
A．Blood plasma leaves blood vessels and becomes lymph surrounding cells． Cells can take in what they need and excrete wastes into this flui
D．Then the extra lymph enters lymphatic vessels and is called interstitial fluid and is returned to the blooD
B．Lymph leaves blood vessels and because blood plasma surrounding cells． Cells can take in what they need and excrete wastes into this flui
D．Then the extra blood plasma enters lymphatic vessels and is called interstitial fluid and is returned to the blooD
C．Interstitial fluid leaves blood vessels and becomes lymph surrounding cells．Cells can take in what they need and excrete wastes into this flui
D．Then the extra lymph enters lymphatic vessels and is called blood plasma and is returned to the bloo
D．Blood plasma leaves blood vessels and becomes interstitial flui
D．Cells can take in what they need and excrete wastes into this flui
D．Then the extra interstitial fluid enters lymphatic vessels and is called lymph and is returned to the bloo
D．
-
The ________ is the preferred site for insulin injection because insulin is most rapidly
A．A.upper outer thighs
B．B.abdomen
C．C.buttocks area
D．D.back area
-
Insulin is usually taken assubcutaneous injections by single-useinsulin penswith disposable needles.（）
是
否
