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单选题
The meat box temperature control circuit, as used in ship service refrigeration system, is an example of （）
A
two position control
B
signal speed floating control
C
proportional control
D
reset control
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AlternatorsC
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A room thermostat activates an electric heater at each individual chilled air outlet when necessaryB
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单选题A solenoid valve used in a refrigeration system should be installed （）.A
with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valveB
upright, sensing temperature of the box, and upstream of the thermal expansion valveC
upright, sensing temperature of the box, and downstream of the thermal expansion valveD
upright, sensing heat of the tail coil, and upstream of the thermal expansion valve
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单选题Compensated flow control or constant flow valves are used in hydraulic systems to（）A
compensate for major leaks in the systemB
maintain the original fluid viscosityC
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单选题Thermostatic expansion valves can be adjusted for （）.A
suction pressure onlyB
head pressure onlyC
superheat onlyD
suction pressure and box temperature
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单选题The shear rams of a ship blowout preventer stack are used in emergency well control to（）.A
close and seal around the drill pipeB
close and seal around casingC
cut off pipe inside the preventer stackD
close and seal around drill collars
考题
单选题The meat box temperature control circuit, as used in ship service refrigeration system, is an example of （）A
two position controlB
signal speed floating controlC
proportional controlD
reset control
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单选题When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions （） which can be used to measure temperature.A
a current will flowB
a power will developC
a heat will flowD
a pressure will produce
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