Question

The solenoid valve _________________

(a) Contains the flow tube and the float

(b) Is controlled by a signal from an external controller

(c) The most expensive way of controlling gas flow

(d) Consists of the rotor and housing

I got this question in an internship interview.

I want to ask this question from Bioreactor topic in section Recovery and Purification of Fermentation Products, Effluent Treatment, Bioreactor Design Considerations of Fermentation Technology

Answer 1

Right option is (b) Is controlled by a signal from an external controller

Explanation: The solenoid valve is controlled by a signal from an external controller operating to control temperature, pH, etc. It can be installed on the outlet side of the rotameter. Whereas a rotameter consists of the flow tube and the float. The mass flow controller is the most expensive way of controlling the gas flow. A peristaltic pump consists of the rotor and housing.