The following section consists of Chemistry Multiple Choice questions on Process Control and Instrumentation. d) Using vibrating condenser Explanation: Null-detector type pH meter has greater accuracy than 0.01 pH. 6. Ans. d) D/A converter. Explanation: The use of chopper amplifier in pH meter leads to zero instability. Which of the following is not the characteristic of null-detector type pH meter? c) Defective electronic circuitry a) Null-detector type pH meter (C) Wattmeter. a) Frequency of the vibrator should be stable Flow Measurement - MCQs with answers Q1. a) Very low resistance b) Moderate resistance … However, for most people, a solidly built PH and moisture meter combo will do … Explanation: Defective calibration is not a failure in pH meters. Q10. This concentration is normally expressed in terms of pH which is defined as the logarithm of the reciprocal of the hydrogen ion. It is connected in the substation to incoming or outgoing feeders to know how energy is given out or received from other end, or to Transformers on HV n LV side to know the Transformer loss. a) Using filter View Answer, 13. pH value of solutions ranges from 1 to 14. strong base Pen pH meter: normally composed of a single scale, conventional measurement range, for the easy and handy equipment. c) Keeping the input impedance high d) Modern pH meter. c) Amplitude of the vibrator should be constant Microprocessor operates only on digital data. View Answer, 7. Figure 2-1 shows separate measuring and reference electrodes. Because the cell has high internal resistance, the pH meter must have a very high input impedance. b) Using choppers for high-input resistance gives rise to spikes of waveforms at the output The zero stability of vibrating condenser amplifier type pH meter is much better than direct coupled amplifier. In the adult community sample (n=182) the measure demonstrated convergent validity by showing positive correlations to obsessive and … AU $24.90. 24. pH of sodium carbonate solution would be less than 7 or more than 7. b) False Offset is simply the mV reading in pH 7 buffer and slope is the mV change per pH unit. The Henderson-Hasselbalch equation: a) allows the graphic determination of the molecular weight of a weak acid from its pH alone. 9. As noted above, electrodes don’t last forever. […] Answer: a. pH Indicators. weak acid strong acid . c) It leads to stability in DC output of phase-sensitive rectifier Portable pH meter: covering an extensive range of regularly employed instruments, the exception is the use of compact DC power equipment can be produced to the scene. February 08, 2021 General Description. ADVERTISEMENTS: 1. The computer in a handheld meter is often more capable than that of a pen-style meter. A. a) Filter d) No resistance Correct Answer. Which of the following can be used to provide automatic temperature compensation? b) Buffer Which of the following is not the characteristic of null-detector type pH meter? In which of the following ways can the disadvantages of chopper amplifier type pH meter be overcome? 99. Eventually the pH becomes constant at 0.70—a point well beyond its value of 1.00 with the addition of 50.0 mL of \(\ce{HCl}\) (0.70 is the pH of 0.20 M HCl). This is because pH measurements are most accurate when multiple calibration points are used to bracket (are above and below) the expected pH value. The result was the pHep (pH electronic paper). Pages Articles Chain Redir Volume Diff Diff art Tot. Which of the following meter is an integrating type instrument? a) It can be battery operated Rinse with deionized water. Your Performance 1. Because the cell has high internal resistance, the pH meter must have a very high input impedance. This meter used an integrated circuit to measure the voltage response of a pH electrode packaged into a pocket-sized meter. Biology Quiz - Multiple Choice Questions with Answers. Get it as soon as Wed, Feb 10. View Answer, 6. The indicator electrode contains a glass membrane, Ag/AgCl reference electrode and a certain concentration of H + ([H +] ref). The flow meter which is replacing the differential pressure meters in its applications is A. Vortex-shedding flow meter B. Electromagnetic flow meters C. Ultrasonic flow meters D. All of these View Answer / Hide Answer