MCQOPTIONS
Saved Bookmarks
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.
| 301. |
*/*_Pick out the first order system from among the following.? |
| A. | Damped vibrator |
| B. | Mercury in glass thermometer kept in boiling water |
| C. | Interacting system of two tanks in series |
| D. | Non-interacting system of two tanks in series |
| Answer» C. Interacting system of two tanks in series | |
| 302. |
*/*_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 e |
| 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 | |
| 303. |
*/*_Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.? |
| A. | 63.2 |
| B. | 87.5 |
| C. | 95 |
| D. | 100 |
| Answer» D. 100 | |
| 304. |
*/*_The characteristic equation for the control system with a closed loop transfer function G‚ÇÅ/1 + G‚ÇÇ is given by 1 + G‚ÇÇ = 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. | |
| 305. |
*/*_Bourdon gauges are used for measuring pressure (kg/cm² )? |
| A. | < atmospheric |
| B. | > 2 (gauge) |
| C. | < 2 (gauge) |
| D. | > 10 (absolute) |
| Answer» C. < 2 (gauge) | |
| 306. |
*/*_Photoelectric pyrometers are suitable in the temperature range of __________ °C.? |
| A. | 400-1600 |
| B. | 800-1600 |
| C. | 800-2500 |
| D. | 400-1000 |
| Answer» C. 800-2500 | |
| 307. |
*/*_The amplitude ratio for the sinusoidal response of __________ is < 1.? |
| A. | Transportation lag |
| B. | First order system |
| C. | Second order system |
| D. | None of these |
| Answer» C. Second order system | |
| 308. |
*/*_A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.? |
| A. | Helium |
| B. | Hydrogen |
| C. | Nitrogen |
| D. | None of these |
| Answer» B. Hydrogen | |
| 309. |
*/*_A pyrheliometer is an instrument used for measuring the? |
| A. | Bright sunshine period |
| B. | Beam radiation |
| C. | Diffuse radiation |
| D. | None of these |
| Answer» C. Diffuse radiation | |
| 310. |
*/*_Measurement of sub-zero Celcius temperature in industry is done most commonly by? |
| A. | Thermocouples |
| B. | Resistance thermometers |
| C. | Gas thermometers |
| D. | Bi-metallic thermometers |
| Answer» C. Gas thermometers | |
| 311. |
*/*_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 of the above |
| Answer» E. | |
| 312. |
*/*_Working principle of radiation pyrometer is based on the? |
| A. | Wien's law |
| B. | Kirchoffs law |
| C. | Stafan-Boltzman law |
| D. | Seebeck effect |
| Answer» D. Seebeck effect | |
| 313. |
*/*_The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be? |
| A. | Under damped |
| B. | Critically damped |
| C. | Over damped |
| D. | None of these |
| Answer» B. Critically damped | |
| 314. |
*/*_Pyrometry refers to the measurement of temperature? |
| A. | With the mercurial thermometer upto 350°C |
| B. | Directly |
| C. | Which is of higher magnitude |
| D. | All of the above |
| Answer» D. All of the above | |
| 315. |
%_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 e |
| 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 | |
| 316. |
%_Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value._% |
| A. | 63.2 |
| B. | 87.5 |
| C. | 95 |
| D. | 100 |
| Answer» D. 100 | |
| 317. |
%_The characteristic equation for the control system with a closed loop transfer function G‚ÇÅ/1 + G‚ÇÇ is given by 1 + G‚ÇÇ = 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. | |
| 318. |
%_Bourdon gauges are used for measuring pressure (kg/cm² )_% |
| A. | < atmospheric |
| B. | > 2 (gauge) |
| C. | < 2 (gauge) |
| D. | > 10 (absolute) |
| Answer» C. < 2 (gauge) | |
| 319. |
%_Photoelectric pyrometers are suitable in the temperature range of __________ °C._% |
| A. | 400-1600 |
| B. | 800-1600 |
| C. | 800-2500 |
| D. | 400-1000 |
| Answer» C. 800-2500 | |
| 320. |
%_The amplitude ratio for the sinusoidal response of __________ is < 1._% |
| A. | Transportation lag |
| B. | First order system |
| C. | Second order system |
| D. | None of these |
| Answer» C. Second order system | |
| 321. |
%_A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature._% |
| A. | Helium |
| B. | Hydrogen |
| C. | Nitrogen |
| D. | None of these |
| Answer» B. Hydrogen | |
| 322. |
%_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 | |
| 323. |
%_Paramagnetism method is not used for the composition determination of __________ in gases._% |
| A. | Oxygen |
| B. | Oxides of nitrogen |
| C. | Carbon dioxide |
| D. | Any of these |
| Answer» D. Any of these | |
| 324. |
%_The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches_% |
| A. | -1 |
| B. | 0 |
| C. | 1 |
| D. | ‚à û |
| Answer» E. | |
| 325. |
%_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 | |
| 326. |
%_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 | |
| 327. |
%_Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a_% |
| A. | Thermocouple |
| B. | Reistance thermometer |
| C. | Mercury in glass thermometer |
| D. | Vapor pressure thermometer |
| Answer» B. Reistance thermometer | |
| 328. |
%_Out of the following themocouple wire insulating material, the highest temperature rating is for_% |
| A. | Teflon |
| B. | Ceramic fibre |
| C. | Asbestos |
| D. | Fibre glass |
| Answer» C. Asbestos | |
| 329. |
%_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 | |
| 330. |
%_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. | |
| 331. |
%_Stalagmometer is used for the measurement of_% |
| A. | Kinematic viscosity |
| B. | Surface tension |
| C. | Refractive index |
| D. | Optical activity |
| Answer» C. Refractive index | |
| 332. |
%_Response of a system to a sinusoidal input is called __________ response._% |
| A. | Impluse |
| B. | Unit step |
| C. | Frequency |
| D. | None of these |
| Answer» D. None of these | |
| 333. |
%_Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?_% |
| A. | CO‚ÇÇ |
| B. | O‚ÇÇ |
| C. | NO |
| D. | NO‚ÇÇ |
| Answer» B. O‚Äö√á√á | |
| 334. |
%_Which of the following thermometers is not suitable for distant reading upto 60 metres?_% |
| A. | Vapor pressure thermometer |
| B. | Mercury in glass thermometer |
| C. | Constant volume gas thermometer |
| D. | Resistance thermometer |
| Answer» C. Constant volume gas thermometer | |
| 335. |
_ The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is$? |
| A. | 0 |
| B. | 1/2 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 336. |
_ __________ is an example of distributed parameter system$? |
| A. | Tubular reactor |
| B. | CSTR |
| C. | On-off controller |
| D. | None of these |
| Answer» B. CSTR | |
| 337. |
_ Continuous measurement of specific gravity of a liquid is done by$? |
| A. | Hydrometer |
| B. | Contact-type electric indicators |
| C. | Displacement meter |
| D. | Both A and C |
| Answer» E. | |
| 338. |
_ Which of the following does not figure in the list of seven substances selected for international temperature scale?$? |
| A. | Ice (F.P) and steam (B.P) |
| B. | Oxygen and sulphur (B.P) |
| C. | Antimony and silver (F.P) |
| D. | Zinc (B.P) and mercury (F.P) |
| Answer» E. | |
| 339. |
_ Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the$? |
| A. | Enhancement or attentuation of redia-tion occurs in the sighting path |
| B. | Object and surrounding are at almost the same temperature |
| C. | Object has varying emissivity |
| D. | Object is transparent |
| Answer» C. Object has varying emissivity | |
| 340. |
_ Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?$? |
| A. | Platinum-platinum + rhodium |
| B. | Iron-constantan |
| C. | Copper-constantan |
| D. | Chromel-alumel |
| Answer» B. Iron-constantan | |
| 341. |
_ A typical example of a physical system with under damped characteristic is a$? |
| A. | U-tube manometer |
| B. | Spring loaded diaphragm valve |
| C. | CSTR with first order reaction |
| D. | Thermocouple kept immersed in a liquid filled thermowell |
| Answer» C. CSTR with first order reaction | |
| 342. |
_ What is the Laplace transform of impulse input having magnitude 'X' ?$? |
| A. | X |
| B. | X² |
| C. | 1/X |
| D. | 1 |
| Answer» E. | |
| 343. |
_ 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$? |
| A. | 1 |
| B. | 1/8 |
| C. | 7/8 |
| D. | -1 |
| Answer» B. 1/8 | |
| 344. |
_ Maximum differential pressure in liquid manometer is __________ psi.$? |
| A. | 20 |
| B. | 30 |
| C. | 40 |
| D. | 50 |
| Answer» C. 40 | |
| 345. |
_ Which of the following thermocouples has the widest temperature measurement range?$? |
| A. | Iron-constantan |
| B. | Chromel-alumel |
| C. | Copper-constantan |
| D. | Platinum-platinum/rhodium |
| Answer» E. | |
| 346. |
_ When a bare thermocouple is covered by a protective sheath, the response becomes$? |
| A. | Faster and oscillatory |
| B. | Faster and non-oscillatory |
| C. | Slower and oscillatory |
| D. | Slower and non-oscillatory |
| Answer» E. | |
| 347. |
_ Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?$? |
| A. | Nickel |
| B. | Brass |
| C. | Chromel |
| D. | Invar |
| Answer» C. Chromel | |
| 348. |
_ Measurement of sub-zero Celcius temperature in industry is done most commonly by$? |
| A. | Thermocouples |
| B. | Resistance thermometers |
| C. | Gas thermometers |
| D. | Bi-metallic thermometers |
| Answer» C. Gas thermometers | |
| 349. |
_ Working principle of radiation pyrometer is based on the$? |
| A. | Wien's law |
| B. | Kirchoffs law |
| C. | Stafan-Boltzman law |
| D. | Seebeck effect |
| Answer» D. Seebeck effect | |
| 350. |
_ For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a$? |
| A. | Large area but small mass |
| B. | High thermal conductivity |
| C. | Small specific heat |
| D. | All of the above |
| Answer» E. | |