MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Analytical Instrumentation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Given below is the block diagram of digital pH meter. Identify the unmarked component. |
| A. | Filter |
| B. | Buffer |
| C. | A/D converter |
| D. | D/A converter |
| Answer» D. D/A converter | |
| 2. |
The zero stability of vibrating condenser amplifier type pH meter is much better than a direct coupled amplifier. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
In which of the following ways can the disadvantages of chopper amplifier type pH meter be overcome? |
| A. | Using zero corrected DC amplifier |
| B. | Using modern design |
| C. | Using digital design |
| D. | Using vibrating condenser |
| Answer» E. | |
| 4. |
Which of the following is not the characteristic of chopper amplifier pH meter? |
| A. | Direct voltage from the electrodes is chopped at the main frequency |
| B. | Using choppers for high-input resistance gives rise to spikes of waveforms at the output |
| C. | It leads to stability in DC output of phase-sensitive rectifier |
| D. | Magnitude of surge increases in the glass electrode output |
| Answer» D. Magnitude of surge increases in the glass electrode output | |
| 5. |
WHICH_OF_THE_FOLLOWING_IS_NOT_THE_CHARACTERISTIC_OF_CHOPPER_AMPLIFIER_PH_METER??$ |
| A. | Direct voltage from the electrodes is chopped at the main frequency |
| B. | Using choppers for high-input resistance gives rise to spikes of waveforms at the output |
| C. | It leads to stability in DC output of phase-sensitive rectifier |
| D. | Magnitude of surge increases in the glass electrode output |
| Answer» D. Magnitude of surge increases in the glass electrode output | |
| 6. |
The zero stability of vibrating condenser amplifier type pH meter is much better than direct coupled amplifier.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
If an instrument fails to balance at zero, it is most likely that the electrodes are defective. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done? |
| A. | Frequency of the vibrator should be stable |
| B. | Frequency of the vibrator should be constant |
| C. | Amplitude of the vibrator should be constant |
| D. | Both frequency and amplitude of the vibrator should be constant and stable |
| Answer» E. | |
| 9. |
Which of the following is not the characteristic of direct reading type pH meters? |
| A. | Simple operation |
| B. | Quick to use |
| C. | Continuous indication output |
| D. | It requires balancing process |
| Answer» E. | |
| 10. |
Which of the following is not the characteristic of null-detector type pH meter? |
| A. | It can be battery operated |
| B. | It has less accuracy |
| C. | It is easy to maintain |
| D. | Its electronic circuits are simple |
| Answer» C. It is easy to maintain | |
| 11. |
Which of the following can be used to provide automatic temperature compensation? |
| A. | Proper insulation |
| B. | Calibration for different temperatures |
| C. | Thermistor |
| D. | Thermometer |
| Answer» D. Thermometer | |
| 12. |
In which of the following ways can zero drift be reduced in pH meters? |
| A. | Using filter |
| B. | Giving zero adjustment arrangement |
| C. | Keeping the input impedance high |
| D. | Using balanced and differential amplifiers |
| Answer» E. | |
| 13. |
Which of the following is the simplest of pH meters? |
| A. | Null-detector type pH meter |
| B. | Direct reading type pH meter |
| C. | Digital pH meter |
| D. | Modern pH meter |
| Answer» B. Direct reading type pH meter | |
| 14. |
Which of the following is not a failure in pH meters? |
| A. | Defective electrodes |
| B. | Defective input circuitry |
| C. | Defective electronic circuitry |
| D. | Defective calibration |
| Answer» E. | |
| 15. |
The electrodes used in pH measurement have which of the following internal resistances? |
| A. | Very low resistance |
| B. | Moderate resistance |
| C. | Very high resistance |
| D. | No resistance |
| Answer» D. No resistance | |
| 16. |
pH meters can be considered as voltage sources with which of the following internal resistances? |
| A. | Very low resistance |
| B. | Moderate resistance |
| C. | Very high resistance |
| D. | No resistance |
| Answer» D. No resistance | |