MCQOPTIONS
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MCQOPTIONS
This section includes 256 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Liquid flow rate in an open channel cannot be measured by a/an __________________? |
| A. | Orifice meter |
| B. | Cipolletti weir |
| C. | Rectangular weir |
| D. | V-notch |
| Answer» B. Cipolletti weir | |
| 152. |
Liquid flow rate in a small channel is best measured by a/an____________________? |
| A. | Weir |
| B. | Pitot tube |
| C. | Vane meter |
| D. | Venturimeter |
| Answer» C. Vane meter | |
| 153. |
Liquid discharge from a tank or reservoir cannot be measured by __________________? |
| A. | Orificemeter |
| B. | Weirs |
| C. | Mouthpieces |
| D. | Notches |
| Answer» B. Weirs | |
| 154. |
Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an ____________________? |
| A. | Gage glass |
| B. | External float gage |
| C. | Differential pressure gage |
| D. | None of these |
| Answer» D. None of these | |
| 155. |
Liquid column manometers are used for measuring the pressure ______________ kgf/cm2? |
| A. | > 2 (gage) |
| B. | < 3 (gage) |
| C. | < 10 (gage) |
| D. | < atmospheric |
| Answer» C. < 10 (gage) | |
| 156. |
______________ is undesirable in thermocouples used in industries ? |
| A. | Linear relation of emf to temperature |
| B. | Corrosion resistance |
| C. | Oxidation resistance |
| D. | Non-linear relation of emf to temperature |
| Answer» E. | |
| 157. |
____________ is the static characteristics of an instrument? |
| A. | Response |
| B. | Tine lag |
| C. | Drift |
| D. | Dynamic error |
| Answer» D. Dynamic error | |
| 158. |
_____________ is an example of distributed parameter system ? |
| A. | Tubular reactor |
| B. | CSTR |
| C. | On-off controller |
| D. | None of these |
| Answer» B. CSTR | |
| 159. |
Instrumentation in a plant offers the advantage of_______________? |
| A. | Greater safety of operation |
| B. | Better quality of product |
| C. | Greater operation economy |
| D. | All A., B. and C. |
| Answer» E. | |
| 160. |
In second order underdamped system ? |
| A. | Decay ratio = overshoot |
| B. | Decay ratio = (overshoot)2 |
| C. | Overshoot increases for increasing damping co-efficient |
| D. | Large damping co-efficient means smaller damping |
| Answer» C. Overshoot increases for increasing damping co-efficient | |
| 161. |
In Bode plot, A.R. vs. w is plotted on a/an _____________ graph paper? |
| A. | Log-lag |
| B. | Triangular |
| C. | Ordinary |
| D. | Semi-log |
| Answer» B. Triangular | |
| 162. |
In Bode plot, φ vs. ω is plotted on a/an ______________ graph paper? |
| A. | log-log |
| B. | Ordinary |
| C. | Semi-log |
| D. | Triangular |
| Answer» B. Ordinary | |
| 163. |
In an exothermic chemical reactor, the manipulated variable is the flow rate of_______________? |
| A. | Coolant |
| B. | Reactants |
| C. | Product |
| D. | None of these |
| Answer» B. Reactants | |
| 164. |
In a single tank system, the transfer function of _____________ to inlet flow rate is 1/(TS+1)? |
| A. | Outlet flow rate |
| B. | Level |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» B. Level | |
| 165. |
In a single tank system, the transfer function of level to inlet flow rate is__________________? |
| A. | R/TS |
| B. | R/(TS + 1) |
| C. | 1/TS |
| D. | None of these |
| Answer» C. 1/TS | |
| 166. |
In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the _____________ variable? |
| A. | Load |
| B. | Manipulated |
| C. | Controlled |
| D. | None of these |
| Answer» D. None of these | |
| 167. |
In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the ____________ variable? |
| A. | Load |
| B. | Manipulated |
| C. | Controlled |
| D. | None of these |
| Answer» B. Manipulated | |
| 168. |
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable? |
| A. | Load |
| B. | Controlled |
| C. | Manipulated |
| D. | None of these |
| Answer» D. None of these | |
| 169. |
In a second order under damped system, the_________________? |
| A. | Time required for the response of first reach its ultimate value is called the response time |
| B. | Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient |
| C. | Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot |
| D. | None of these |
| Answer» C. Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot | |
| 170. |
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________? |
| A. | G/(1 + H) |
| B. | H/(1 + G) |
| C. | G/H |
| D. | H/G |
| Answer» C. G/H | |
| 171. |
In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__________________? |
| A. | Overdamped response |
| B. | Underdamped response |
| C. | Undamped response |
| D. | Unstable response |
| Answer» C. Undamped response | |
| 172. |
If response of a control system is to be free of offset and oscillation, the most suitable controller is_________________? |
| A. | Proportional controller |
| B. | Proportional-derivative (PD) controller |
| C. | Proportional-integral (PI) controller |
| D. | Proportional integral-derivative (PID) controller |
| Answer» E. | |
| 173. |
Identify an unbounded input from inputs whose transfer functions are given below______________? |
| A. | 1 |
| B. | 1/S |
| C. | 1/S2 |
| D. | 1/(S2 + 1) |
| Answer» D. 1/(S2 + 1) | |
| 174. |
Humidity of air can be determined by a__________________? |
| A. | Chromatograph |
| B. | Sling psychrometer |
| C. | Mass spectrometer |
| D. | Polarimeter |
| Answer» C. Mass spectrometer | |
| 175. |
Hot wire anemometer is used for the measurement of___________________? |
| A. | Flow rates of fluids |
| B. | Flow rates of granular solids |
| C. | Very high temperature |
| D. | Thermal conductivity of gases |
| Answer» B. Flow rates of granular solids | |
| 176. |
High temperature of around 2000°C of incandescent gas mantles is measured by a/an __________________? |
| A. | Specially designed thermocouple |
| B. | Optical pyrometer |
| C. | Radiation pyrometer |
| D. | None of these |
| Answer» D. None of these | |
| 177. |
Helium gas constant volume thermometer is suitable for the measurement of a temperature of ______________ °C? |
| A. | < 100 |
| B. | < 0 |
| C. | > 0 |
| D. | > 800 |
| Answer» C. > 0 | |
| 178. |
Gas chromatography is used for the measurement of ________________? |
| A. | Temperature |
| B. | Pressure |
| C. | Concentration |
| D. | Flow rate |
| Answer» D. Flow rate | |
| 179. |
Gas analysis is commonly done using the___________________? |
| A. | Thermal conductivity cell |
| B. | X-ray diffraction |
| C. | Mass spectrometer |
| D. | Emission spectrometer |
| Answer» B. X-ray diffraction | |
| 180. |
Gain margin is equal to the_________________? |
| A. | Amplitude ratio |
| B. | Reciprocal of amplitude ratio |
| C. | Gain in P controller |
| D. | Gain in P-I controller |
| Answer» C. Gain in P controller | |
| 181. |
For two non-interacting first order systems connected in series, the overall transfer function is the ______________ of the individual transfer functions? |
| A. | Product |
| B. | Ratio |
| C. | Sum |
| D. | Difference |
| Answer» B. Ratio | |
| 182. |
For the time domain function f(t) = t, the Laplace transform of ∫0 t f(t) dt is given by___________________? |
| A. | 1/2 S3 |
| B. | 2/S3 |
| C. | 1/S3 |
| D. | 2/S2 |
| Answer» D. 2/S2 | |
| 183. |
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a__________________? |
| A. | Large area but small mass |
| B. | High thermal conductivity |
| C. | Small specific heat |
| D. | All A , B & C |
| Answer» E. | |
| 184. |
For an input forcing function, X(t) = 2t2, the Laplace transform of this function is________________? |
| A. | 2/s2 |
| B. | 4/s2 |
| C. | 2/s3 |
| D. | 4/s3 |
| Answer» E. | |
| 185. |
For a feed back control system to be stable, the _________________? |
| A. | Roots of the characteristic equation should be real |
| B. | Poles of the closed loop transfer function should lie in the left half of the complex plane |
| C. | Bode plots of the corresponding open loop transfer function should monotonically decrease |
| D. | Poles of the closed loop transfer function should lie in the right half of the complex plane |
| Answer» C. Bode plots of the corresponding open loop transfer function should monotonically decrease | |
| 186. |
Flow rate through an orifice is _____________ the pressure differential? |
| A. | Proportional to |
| B. | Inversely proportional to the square root of |
| C. | Proportional to the square root of |
| D. | Inversely proportional to the square of |
| Answer» D. Inversely proportional to the square of | |
| 187. |
Flow rate of sludge is not measured by a/an_________________? |
| A. | Orificemeter |
| B. | Open weir |
| C. | Kennison nozzle |
| D. | Both B. & C. |
| Answer» E. | |
| 188. |
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________? |
| A. | Magnetic flowmeter |
| B. | Pitot tube |
| C. | Flow nozzle type flowmeter |
| D. | Turbine flowmeter |
| Answer» B. Pitot tube | |
| 189. |
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an ________________? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Magnetic flow meter |
| D. | Hot wire anemometer |
| Answer» D. Hot wire anemometer | |
| 190. |
Flow rate of a river is measured by a/an____________________? |
| A. | Pitot tube |
| B. | Vane meter |
| C. | Kennison nozzle |
| D. | Open weir |
| Answer» C. Kennison nozzle | |
| 191. |
Flapper nozzle is used in a/an ______________ controller? |
| A. | Electronic |
| B. | Hydraulic |
| C. | Pneumatic |
| D. | None of these |
| Answer» D. None of these | |
| 192. |
Flame photometry is used for the determination of compositional analysis of_______________? |
| A. | Solids |
| B. | Alkali metals |
| C. | Natural gas |
| D. | Isotopes |
| Answer» C. Natural gas | |
| 193. |
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ? |
| A. | w = 1/√14, Kc = 45/7 √14 |
| B. | w = √(7/6), Kc = 46/3 |
| C. | w = 1, Kc = 13 |
| D. | w = √(7/8), Kc = 45/4 |
| Answer» C. w = 1, Kc = 13 | |
| 194. |
Feed forward controller accounts for the ______________ changes? |
| A. | Set point |
| B. | Load |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. & B. | |
| 195. |
Emission spectroscopy is used for__________________? |
| A. | Solids and metal analysis |
| B. | Determining water purity |
| C. | Determination of CO2 in gases |
| D. | NOx determination |
| Answer» B. Determining water purity | |
| 196. |
Emf generated in a thermocouple depends on the temperature ___________________? |
| A. | Of cold junction only |
| B. | Of hot junction only |
| C. | Difference between hot and cold junctions |
| D. | Difference between cold junction and atmospheric temperature |
| Answer» D. Difference between cold junction and atmospheric temperature | |
| 197. |
E.m.f. generated by thermocouples is of the order of ________________? |
| A. | Milli volts |
| B. | Micro volts |
| C. | Volts |
| D. | Kilo volts |
| Answer» B. Micro volts | |
| 198. |
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________________? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum + rhodium |
| D. | None of these |
| Answer» B. Iron-constantan | |
| 199. |
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is_______________? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum + rhodium |
| D. | Either A., B. or C. |
| Answer» D. Either A., B. or C. | |
| 200. |
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is ___________________? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-rhodium |
| D. | Platinum-platinum + rhodium |
| Answer» C. Platinum-rhodium | |