更多"One characteristic of a pulse type "的相关试题:
[单项选择]One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）
A. high TBN value
B. low oil floc point
C. low oil demulsibility
D. low oil neutralization number
[单项选择]One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator （）.
A. high temperature distillate can be re- circulated to induce additional flashing
B. scale formation is not a severe problem
C. cold shocking is more effective in removing scale
D. water purity is greatly increased at high capacity
[单项选择]The type of joint formed when an edge of one plate is laid over the edge of the plate to which it is riveted is a（）.
A. grip joint
B. strap joint
C. thread joint
D. lap joint
[单项选择]The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A. method of supplying air
B. cooling system
C. method of igniting fuel
D. valve operating mechanism
[单项选择]A light characteristic of composite group flashing indicates that there is a(n)（）.
A. sharp turn in the channel
B. narrowing in the channel at that point
C. junction in the channel
D. obstruction that must be left to port
[多项选择]What are the characteristic of link state routing protocols?（）
A. The exchange of advertisement is triggered by a change in the network.
B. All routers exchange routing tables with each other iIn a multipoint network.
C. Packets are routed based upon the shortest path to the destination.
D. Paths are chosen depending on the cost efficiency factor.
E. Every router in an OSPF area is capable of representing the entire network topology.
F. Only the designated router in an OSPF area can represent the entire network topology.
[单项选择]Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）
A. Leaves a residue
B. Cost，relative to other agents
C. Breaks down while under prolonged storage
D. Conducts electricity
[单项选择]Which characteristic or condition will have the greatest effect on increasing a hydraulic oils viscosity?（）
A. Pour point
B. Cloud point
C. Vacuum
D. Pressure
[单项选择]Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）
A. At the designed operating temperature, the liquid refrigerant charge has changed to a vapor
B. The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity
C. The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature
D. The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
[单项选择]Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）
A. Low viscosity index
B. Low carbon forming tendencies
C. High film strength
D. High non-corrosive qualities
[单项选择]What is a characteristic of all centrifugal cargo pumps? （）
A. They are self-priming
B. Decreasing the speed of rotation will decrease the discharge pressure
C. Opening the discharge valve wider will increase the discharge pressure
D. All of the above
[单项选择]The characteristic of a lighted cardinal mark may be （）.
A. very quick flashing
B. flashing
C. fixed
D. occulting
[单项选择]Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）
A. Slightly higher fuel consumption
B. Lack of directional control when backing
C. Inefficient at high shaft RPM
D. Some unusual handling characteristics
[单项选择]The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
A. High frequency pulses
B. Combinations of high and low frequency pulses
C. The same frequency for all stations in a chain
D. Varied long and short pulses
[单项选择]The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
A. persistence
B. pulse repetition rate
C. pulse length
D. resolution
[单项选择]What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）
A. Weight
B. Temperature
C. Electrical nonconductivity
D. Cost
[单项选择]What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）
A. Effective even if ventilation is not shut down
B. Will not deteriorate in storage
C. Non-corrosive
D. Effective on electrical equipment
[单项选择]Which characteristic is an advantage of Halon as a fire extinguishing medium?（）
A. Electrically non-conductive
B. Relatively inexpensive
C. Effective against chemicals containing an oxidizer
D. All of the above
[单项选择]The main advantage and chief characteristic of a Steulchen boom is that it can be（）.
A. operated by one winchman
B. cradled on deck
C. swung from one hatch to the adjacent hatch
D. collared to the mast
