Analytical Instrumentation Practice Test 5

1. Which of the following is the function of the throttling device?

Maintains pH of a water

Maintains constant flow rate

Filtering

Purifies water

2. Which of the following materials are used as a gel to which biocatalytic membrane is fixed in ammonia selective electrode?

Urease

Polyacrylamide

Acrylamide

Urea

3. LiCl salt bridge is more suitable in organic solvents than KCl.

False

True

4. Which of the following gas permeable membrane is used for carbon dioxide gas sensing electrode?

Fluorocarbon

PVC membrane

Polythene

Silicon rubber

5. Given below is the diagram of liquid membrane electrode. Identify the unmarked component.

Hydrophobic material

Water absorbing material

Solid material

Semi-permeable membrane

6. If a solid or liquid membrane is placed in pure water, the membrane dissolves slightly, producing an equilibrium concentration of the measured ion. This is represented as __________

Concentration of standard solution, Cs

Blank correction, Cb

A constant, Eo

Activity

7. Given below is the diagram of biosensor. Identify the unmarked component.

Filter

A/D converter

Microprocessor

Transducer

8. In Ammonia electrode, diffusion of dissolved ammonia occurs through the membrane until which of the following conditions occur?

Activity becomes equal on both sides

Differential pressure is low

Partial pressure becomes equal on both sides

Concentration becomes equal on both sides

9. In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done?

Frequency of the vibrator should be stable

Frequency of the vibrator should be constant

Amplitude of the vibrator should be constant

Both frequency and amplitude of the vibrator should be constant and stable

10. Which of the following section plays a major role in maintaining the accuracy of the dissolved oxygen analyser?

Condensing section

Analysing section

Transmitting section

Inlet section