As the amount of moisture suspended in the air decreases, the wet–bulb depression increases
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Controller receives input signals from which of the following:
For clean rooms where the dust has to be arrested down to ____, absolute HEPA filters are used:
Bypass Diversion method is the _____ efficient method for varying the flow to the heating coil:
Which one of the following is universal inputs
As the head increases, the fan will need ______ horsepower to deliver the required quantity of air against the system head or pressure:
In which of the following control action the rate of movement of the controller (closing or opening a valve) is a function of the amount of deviation from the set-point:
Water vapor in the air creates its own vapor pressure
Error of a control action is the difference between which of the following:
The larger the temperature difference between the evaporator surface of an air conditioning system and the air, the ___ will be the amount of mositure removed:
Dew point is measured by which of the following sensors:
Thermistors are temperature sensitive _____ that exhibit a large change in resistance over a relatively small range of temperature.
Generally air can hold ___ amount of water vapor
The temperature-resistance characteristic of a thermistor is ______:
Venturi tubes exhibit a very _____ pressure loss compared to other differential pressure meters:
Which of the following sensors use changes in frequency to measure relative humidity:
Bulb and capillary sensors are used to measure which of the following:
Beyond the proportional band, P controller acts as _____:
The electronic signals output could be which of the following:
_____ have two dissimilar metal wires joined at one end used to measure temperature:
Which of the following valve have good modulating characteristics near closed, but become insensitive to further opening at near full open
Which of the following control system is cheaper:
In floating control, the set point is the mid point of the ON point and OFF point:
The major difference between electronic control systems and microprocessor-based systems is in the handling of the ______.
The function of the _______ sensor is to reset or automatically change the setpoint of the controller.
_____ temperature is the actual temperature of the air measured by an ordinary thermometer:
______ actuators are described in terms of their spring range.
Thermocouples are most common in which of the following process applications.
strain gauge is to measure which of the following:
Forced draft fans are located at the _____ of the tower for movement of air through the cooling tower: