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Question:
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Rectifier is used to convert ac to dc current:
True
Adhesive filters remove up to _______ of dust particles
_______
90%
When the wet bulb temperature reading is close to the dry bulb temperature reading from the same instrument, then _______
Relative humidity is high
Which of the following device is provided with build with overload protection:
starter
_______ heat propagates through a transparent medium such as air without affecting the mediums temperature, pressure and volume
Radiation
A satisfactory Carbon dioxide measurement in an indoor environment is a maximum of _______:
1000 ppm
For converting the gauge pressure to absolute, which of the following should be added to the pressure reading from a manifold gauge set:
+14.7
The power factor is the ratio of:
True power to Apparent power
A vacuum gauge reads pressure in _______
Microns
Charging and discharging of inductor and capacitor in _______ manner:
exponental
One horsepower is equivalent to _______ watts:
746
P–N Diodes are also called as _______
Rectifiers
The top of the chimney should be at least _______ higher than the roof:
2 feet
Which of the following compressors are oil free dry units:
Centrifugal compressors
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