Explanation: Polarographic transducer must be used for dissolved oxygen analyser. Dissolved oxygen is the measure of ability of water to sustain aquatic life.

Explanation: Solubility of oxygen in water decreases with increase in temperature. Dissolved oxygen is the measure of ability of water to sustain aquatic life.

Explanation: The water to be analysed flows into the condenser through a throttling device. It is cooled in the condenser.

Explanation: The function of the throttling device is to maintain a constant flow rate. The water then passes into the condenser.

Explanation: Transmitting section plays a major role in maintaining the accuracy of the dissolved oxygen analyser. It is the section after the analysing section.

Explanation: Wheatstone bridge is used in dissolved oxygen analyser. Initially, the bridge is in a balanced condition.

Explanation: In dissolved oxygen analyser, the electrometer consists of potassium hydroxide solution. It produces hydrogen due to the electrolysis process.

Explanation: The dissolved oxygen analyser is based on katharometer. It works on the principle of thermal conductivity detector.

Explanation: Oxygen content can be controlled by adding hydrazine with water. It is important to maintain dissolved oxygen content in boilers to reduce corrosion.

Explanation: In dissolved oxygen analyser, normally more than one condenser is used. The condensers are present in the condenser section.