MCQOPTIONS
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MCQOPTIONS
This section includes 830 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. |
Bourdon gauges are used for measuring pressure (kg/cm² ) |
| A. | < atmospheric |
| B. | > 2 (gauge) |
| C. | < 2 (gauge) |
| D. | > 10 (absolute) |
| Answer» C. < 2 (gauge) | |
| 152. |
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is |
| A. | 2 |
| B. | 5 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 153. |
The temperature range for which copper resistance thermometer can be used is __________ °C |
| A. | 0 to 150 |
| B. | -200 to 150 |
| C. | 350 to 750 |
| D. | 500 to 900 |
| Answer» C. 350 to 750 | |
| 154. |
The characteristic equation for the control system with a closed loop transfer function G₁/1 + G₂ is given by 1 + G₂ = 0. The characteristic equation for the control system |
| A. | Depends only upon the open loop transfer function |
| B. | Determines its stability |
| C. | Is the same for set point or load changes |
| D. | All of the above |
| Answer» E. | |
| 155. |
Which of the following is not the triple point of water? |
| A. | 32°R |
| B. | 273°K |
| C. | 492°R |
| D. | 32°F |
| Answer» B. 273°K | |
| 156. |
Which of the following is not a composition measuring instrument? |
| A. | Thermal conductivity cell |
| B. | Mass spectrometer |
| C. | Polarograph |
| D. | Hot wire anemometer |
| Answer» E. | |
| 157. |
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by |
| A. | Reducing value of Kc |
| B. | Introducing integral control |
| C. | Introducing derivative control |
| D. | None of the above |
| Answer» C. Introducing derivative control | |
| 158. |
Starting temperature of optical radiation pyrometer is __________ °C. |
| A. | 800 |
| B. | 400 |
| C. | 1200 |
| D. | 1500 |
| Answer» B. 400 | |
| 159. |
Which of the following controllers has maximum offset? |
| A. | P-controller |
| B. | P-I controller |
| C. | P-D controller |
| D. | P-I-D controller |
| Answer» B. P-I controller | |
| 160. |
When the damping co-efficient (ξ) is unity, the system is |
| A. | Overdamped |
| B. | Critically damped |
| C. | Underdamped |
| D. | Highly fluctuating |
| Answer» C. Underdamped | |
| 161. |
The unit step response of the transfer function 1/(s² + 2s + 3) |
| A. | Has a non-zero slope at the origin |
| B. | Has a damped oscillatory characteristics |
| C. | Is overdamped |
| D. | Is unstable |
| Answer» C. Is overdamped | |
| 162. |
The open loop transfer function of a control system is KR/(1 + TS) . This represents |
| A. | A first order system |
| B. | Dead time system |
| C. | A first order time lag |
| D. | A second order system |
| Answer» B. Dead time system | |
| 163. |
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by |
| A. | Filling nitrogen under pressure in the stem |
| B. | Increasing the diameter of the tube |
| C. | Using steel tube in place of glass tube |
| D. | Accounting for the tube expansion |
| Answer» B. Increasing the diameter of the tube | |
| 164. |
Which of the following can measure temperatures in the range of - 20 to 300°C ? |
| A. | Mercury in glass thermometer |
| B. | Vapor pressure thermometer |
| C. | Resistance thermometer |
| D. | None of these |
| Answer» E. | |
| 165. |
Compositional analysis of flue gas coming out of a furnace in respect of O₂ and CO₂% can be continuously done by a/an |
| A. | Orsat apparatus |
| B. | Thermal conductivity cell |
| C. | Zirconia probe |
| D. | Chromatograph |
| Answer» C. Zirconia probe | |
| 166. |
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 | |
| 167. |
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing |
| A. | Helium |
| B. | Nitrogen |
| C. | Hydrogen |
| D. | None of these |
| Answer» B. Nitrogen | |
| 168. |
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is |
| A. | 1 |
| B. | 0.5 |
| C. | 1/√2 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 169. |
The transfer function of a pure dead time system with dead time τd is |
| A. | 1/(τds + 1) |
| B. | Τds + 1 |
| C. | E-τds |
| D. | Eτds |
| Answer» D. Eτds | |
| 170. |
The transfer function of a first order system is |
| A. | 1/(Ts + 1) |
| B. | 1/Ts |
| C. | S/(Ts + 1) |
| D. | None of these |
| Answer» B. 1/Ts | |
| 171. |
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C. |
| A. | 250 |
| B. | 500 |
| C. | 750 |
| D. | 1000 |
| Answer» C. 750 | |
| 172. |
Which of the following flow-metering instru-ments is an areameter? |
| A. | Venturimeter |
| B. | Rotameter |
| C. | Pitot tube |
| D. | Hot wire anemometer |
| Answer» C. Pitot tube | |
| 173. |
Which is the most suitable instrument for measuring pressure below 3 microns? |
| A. | Mcleoid gauge |
| B. | Alphatron |
| C. | Ionisation gauge |
| D. | Bourdon guage |
| Answer» D. Bourdon guage | |
| 174. |
Which of the following is a 'contact' pyrometer? |
| A. | Resistance pyrometer |
| B. | Optical pyrometer |
| C. | Radiation pyrometer |
| D. | Infra red pyrometer |
| Answer» B. Optical pyrometer | |
| 175. |
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C? |
| A. | Optical pyrometer |
| B. | Radiation pyrometer |
| C. | Photoelectric pyrometer |
| D. | Thermocouples |
| Answer» E. | |
| 176. |
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 | |
| 177. |
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C. |
| A. | 0.0001 |
| B. | 0.001 |
| C. | 0.01 |
| D. | 0.1 |
| Answer» C. 0.01 | |
| 178. |
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is |
| A. | 1 + et |
| B. | 1 - et |
| C. | 1 + e-t |
| D. | 1 - e-t |
| Answer» E. | |
| 179. |
Which of the following thermocouple materials does not contain nickel? |
| A. | Alumel |
| B. | Chromel |
| C. | Constantan |
| D. | None of these |
| Answer» E. | |
| 180. |
Which of the following judges the accuracy of an instrument? |
| A. | Dead zone |
| B. | Drift |
| C. | Static error |
| D. | None of these |
| Answer» D. None of these | |
| 181. |
Which of the following is not a differential pressure flow meter? |
| A. | Rotameter |
| B. | Flow nozzle |
| C. | Orificemeter |
| D. | Venturimeter |
| Answer» B. Flow nozzle | |
| 182. |
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple? |
| A. | 0.1 |
| B. | 3 |
| C. | 13 |
| D. | 29 |
| Answer» D. 29 | |
| 183. |
Mercury thermometer can be used to measure the temperature upto __________ °C. |
| A. | 100 |
| B. | 250 |
| C. | 350 |
| D. | 750 |
| Answer» D. 750 | |
| 184. |
Which of the following thermocouples has the widest temperature measurement range? |
| A. | Iron-constantan |
| B. | Chromel-alumel |
| C. | Copper-constantan |
| D. | Platinum-platinum/rhodium |
| Answer» E. | |
| 185. |
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+rhyodium |
| Answer» C. Platinum-rhodium | |
| 186. |
Which of the following fluid flow measuring devices can measure the largest flow rate? |
| A. | V-notch |
| B. | Rotameter |
| C. | Orificemeter |
| D. | Weir |
| Answer» E. | |
| 187. |
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 | |
| 188. |
Range of hydrogen gas constant volume themometer is __________ °C. |
| A. | -10 to 20 |
| B. | 0 to 100 |
| C. | 100 - 500 |
| D. | 400 - 1000 |
| Answer» C. 100 - 500 | |
| 189. |
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury. |
| A. | 250 |
| B. | 350 |
| C. | 550 |
| D. | 700 |
| Answer» D. 700 | |
| 190. |
Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C. |
| A. | Mercury thermometer |
| B. | Bimetallic thermometer |
| C. | Radiation pyrometer |
| D. | None of these |
| Answer» C. Radiation pyrometer | |
| 191. |
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer. |
| A. | Radiation |
| B. | Optical |
| C. | Photoelectric |
| D. | None of these |
| Answer» D. None of these | |
| 192. |
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'. |
| A. | Celcius |
| B. | Rankine |
| C. | Reumur |
| D. | Farenhite |
| Answer» D. Farenhite | |
| 193. |
Conversion formula for converting amplitude ratio (AR) into decibels is |
| A. | Decibel = 20 log10 (AR) |
| B. | Decibel = 20 loge (AR) |
| C. | Decibel = 20 log10 (AR)0.5 |
| D. | Decibel = 20 loge (AR)0.5 |
| Answer» B. Decibel = 20 loge (AR) | |
| 194. |
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is |
| A. | 1 |
| B. | 1/8 |
| C. | 7/8 |
| D. | -1 |
| Answer» B. 1/8 | |
| 195. |
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere? |
| A. | Platinum-platinum + rhodium |
| B. | Iron-constantan |
| C. | Copper-constantan |
| D. | Chromel-alumel |
| Answer» B. Iron-constantan | |
| 196. |
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³. |
| A. | 50 |
| B. | 100 |
| C. | 10 |
| D. | 1 |
| Answer» E. | |
| 197. |
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 | |
| 198. |
Which of the following is the dynamic characteristics of an instrument? |
| A. | Reproducibility |
| B. | Sensitivity |
| C. | Dead zone |
| D. | Fidelity |
| Answer» E. | |
| 199. |
Which of the following is not a speed measuring instrument? |
| A. | Psychrometer |
| B. | Stroboscope |
| C. | Tachometer |
| D. | All of the above |
| Answer» B. Stroboscope | |
| 200. |
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 | |