The effective temperature of air is dependent upon（） Ⅰ.relative humidity Ⅱ.air velocity
A . Ⅰonly
B . Ⅱonly
C . Both Ⅰand Ⅱ
D . NeitherⅠnor Ⅱ
相似题目
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In the refrigeration compressor the temperature of the vapor is （） by compression.
A . raised
B . risen
C . reduced
D . maintained constant
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The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
A . Cross
B . Parallel
C . Counter
D . Circular
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If the temperature drops low enough, oil will not flow, （） just tell us the temperature.
A . Hash point
B . Viscosity
C . Pour point
D . Cetane number
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A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 80 ℃ and a dry bulb temperature of 85℃.When the hold is sealed and the dry bulb temperature decreases, the relative humidity in the space will （）
A . decrease
B . increase
C . decrease to zero
D . remain unchanged
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The temperature of the refrigerant in the evaporator coil depends mostly upon the （）.
A . refrigerant pressure in the evaporator
B . cooling water temperature to the condenser
C . heat load in the refrigerator compartment
D . solenoid valve in the liquid line
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If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）
A . a dirty lube oil strainer
B . internal water leaks
C . an oil suction line restriction
D . excessive wears of the cooling water pum
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Ambient temperature is the （）.
A . amount of temperature rise with no load
B . temperature of the compartment where the motor is located
C . normal operating temperature, less the room temperature
D . amount of temperature developed by an operating motor
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Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.
A . the more
B . the higher
C . the lower
D . the highest
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As the temperature of an air mass decreases，the（）.
A . absolute humidity decreases
B . relative humidity increases
C . specific humidity decreases
D . dew point rise
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In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
A . raw water pump discharge
B . expansion tank outlet
C . cooling water heat exchanger
D . outlet engine jacket water outlet
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The (auto)ignition temperature is that temperature atwhich（）.
A . no spark or flame is required to ignite gas or vapor
B . a fuel begins to give off explosive vapors
C . a fuel if ignited will continue to burn
D . a 1% mixture of the fuel with air will explode
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The temperature of a refrigerant gas is the highest （）.
A . at the compressor discharge
B . at the compressor suction
C . in the expansion valve
D . in the receiver
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The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.
A . 8-10℃
B . 10-12℃
C . 10-15℃
D . 10-20℃
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The flash point of a liquid refers to the temperature （）
A . at which a liquid will give off inflammable vapors
B . at which a liquid will burn steadily
C . at which a liquid will explode
D . that a liquid must reach before it will flow readily
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As the temperature of the air reaches the dew point，（）.
A . rain must develop
B . fog may form
C . it begins to snow
D . water freeze
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If the compressor-discharge temperature is higher than the receiver temperature（）
A . increase the amount of cooling water to the condenser
B . decrease the amount of cooling water to the condenser
C . add more refrigerant to the system
D . remove some of the refrigerant from the system
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The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.
A . to be kept
B . logged
C . changed
D . has remained
-
When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be （）.
A . dry
B . wet
C . super-cooled
D . superheated
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. The temperature today is about 68 degrees. That's the temperature in ______________.
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（In) warm-blooded animals, their body temperature, regardless of the temperature of the an
(In) warm-blooded animals, their body temperature, regardless of the temperature of the animals' (surroundings), (are) maintained within narrow (limits).
A．In
B．surroundings
C．are
D．limits
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Temperature affects the viscosity of oil.（)
是
否
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– What’s the temperature today –（) .
A.Nice and cool
B.The weather forecast says it’s fine
C.About 18 degrees
D. Sure, it’s sunny
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What will the temperature be in Beijing？
A．- 2C to 412
B．- 312 to 312
C．- 41E to 212
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The （） the temperature, the greater the retardation of food degradation
