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What is the typical input voltage range to voltage sensor?

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In HVAC applications for higher temperature measurement which of the following sensors is generally used?
Which of the following sensor uses frequency to measure relative humidity?
The dirty and clogged air filter in a heat pump can cause:
The RTD temperature sensor have a …………….. temperature coefficient.
In heat pump defrost cycle, up to what temperature of outdoor coil the heat pump will remain cooling cycle?
When the length of the wire has increased, the resistance of the wire ……………………
The RTD temperature-resistance characteristic is linear.
How many times the heat pumps are more efficient than electric resistance heaters in their user of electricity?
In a heat pump, which of the following mode is best to charge with refrigerant?
Which of the following is the suitable current signal range?
Which is the simplest HVAC control?
For every unit of electricity the heat pumps are capable of producing ………… or more units of heat.
When the frost is formed on the outdoor coil of heat pump:
…………………………. assembly is called transmitter in control system.
Which of the following is not a self powered control device?
Which of the following compressors are mostly used in residential and light commercial constructions?
Which of the following temperature sensor is most suitable to measure 1000 0 F?
Which of the following sensor is used to provide two position (open or close) signals?
The time of defrost cycle depends on ………….
Current sensors are used to measure ………….
What is the highest possible COP number of heat pump?
Which of the following is the primary controlled variable in HVAC applications?
When liquid velocity increases the induced voltage in the magnetic flow meter ……………..
The controlled device receives the signals from …………….
Which of the following is the measure of overall heating efficiency of heat pump?
What may be maximum pressure that self powered VAV diffuser can operate?
In HVAC control system, the controller gets the signal from
In which of the following heat pump modes, the inside heat is moved to outside of the house?
…………………………………………….. helps in measuring dew point.
Magnetic flow measures the flow rate by ………………………. Caused by the moving fluid when exposed to strong magnetic field?
Which of the following substance circulates through heat pump that transfers, absorbs and releases heat?
Normally the air moves from areas of …………………. to ………………. With the available openings
The installation cost of heat pumps is more than electric resistance heaters.
In low temperature measurements the error in the RTD measurement will be high.
What is the purpose of reversing valve in heat pump?
If the valve opens when the control signal is applied, this valve is called as ………….
When 170 volts is supplied to 208/230 volts compressor ………..
Pitot tube is used to measure ………………..
In ultrasonic sensors, the fluid flow can be measured as a function of the ……………..