Analytical Instrumentation Practice Test 4

1. The use of thermistor eliminates the requirement for amplification.

False

True

2. Which of the following is not the disadvantage of hydrogen electrode?

H2 gas at 1 atmospheric pressure is difficult to set up and transport

Presence of oxidising agents alters the potential

It gives a salt error

Platinum can be easily poisoned

3. Which of the following is the effective sample volume in analyzers based on gas density?

10 ml

50 ml

20 ml

5 ml

4. In which of the following ways can chemiluminescence occur in compounds of nitrogen?

When NO reacts with ozone

When NO₂ returns to ground state from excited state

When NO₂ is reduced to NO

When NO reacts with oxygen

5. Which of the following are not the characteristics of conductivitimetry method used to measure sulphur dioxide?

Fast response

High sensitivity

Free from interference by other gases

Good accuracy

6. Given below, is the diagram of Ultraviolet Fluorescence method. Identify the unmarked component.

Fluorescence chamber

Electronic circuit

Supply

Filter

7. Which of the following organic compounds will have the highest intensity of response when introduced in a flame ionization detector?

Butane

Methane

Ethane

Propane

8. How can the high speed of response be obtained in thermal conductivity analyzers?

By increasing the temperature of gas surrounding the filaments

By reducing the pressure of gas surrounding the filaments

By reducing the temperature of gas surrounding the filaments

By increasing the pressure of gas surrounding the filaments

9. Sensitivity to total sulphur by Flame-photometric detector is which of the following levels?

0.01 ppm

1 ppm

2 ppm

0.1 ppm

10. Which of the following is not the advantage of glass electrodes?

Modern electrodes can withstand severe treatment

It has no salt error

It gives accurate results for high as well as low pH values

It is simple to operate