MCQOPTIONS
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MCQOPTIONS
This section includes 71 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
For the block diagram shown below : The characteristic equation is |
| A. | ? l S (? p s + 1) + K c . K p (? l S + 1) e -? d s = 0 |
| B. | (? m S + 1) (? p S + 1) + K m . K p e -? d S = 0 |
| C. | ? l S (? m S + 1) (? p S + 1) + K c . K p . K m (? l s + 1) e -? d S = 0 |
| D. | (? m s + 1) (? p s + 1) + K c . K p . K m . e -? d S = 0 |
| Answer» D. (? m s + 1) (? p s + 1) + K c . K p . K m . e -? d S = 0 | |
| 52. |
The calibration data of a thermocouple with its cold junction at 0°C are given below. The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple ? |
| A. | 3.26 mv |
| B. | 0.80 mv |
| C. | 2.46 mv |
| D. | 2.43 mv |
| Answer» D. 2.43 mv | |
| 53. |
The unit step response of the transfer function reaches its final steady state assymptotically after |
| A. | a monotonic increase. |
| B. | a monotonic decrease. |
| C. | initially increasing and then decreasing. |
| D. | increasing decreasing and then increasing. |
| Answer» B. a monotonic decrease. | |
| 54. |
Liquid argon level in a pressurised storage tank (at 3 kg/cm 2 ) 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 | |
| 55. |
Starting temperature of optical radiation pyrometer is __________ °C. |
| A. | 800 |
| B. | 400 |
| C. | 1200 |
| D. | 1500 |
| Answer» B. 400 | |
| 56. |
__________ thermometer can not measure sub-zero (< 0° C) temperature, |
| A. | Mercury in glass |
| B. | Bimetallic |
| C. | Vapor pressure |
| D. | Resistance |
| Answer» C. Vapor pressure | |
| 57. |
The characteristic equation for the control system with a closed loop transfer function G 1 /1 + G 2 is given by 1 + G 2 = 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 'a', 'b' & 'c' |
| Answer» E. | |
| 58. |
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 | |
| 59. |
Which of the following can not measure a temperature of 1600°C ? |
| A. | Platinum resistance thermometer |
| B. | Thermocouple |
| C. | Photo-electric pyrometer |
| D. | Radiation pyrometer |
| Answer» B. Thermocouple | |
| 60. |
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 | |
| 61. |
Which thermocouple can be used to measure a temperature of around 1400°C ? |
| A. | Copper-constantan |
| B. | Aluminium-chromel |
| C. | Platinum-platinum+rhodium |
| D. | None of these |
| Answer» D. None of these | |
| 62. |
In a closed loop system, the process to be controlled is an integrating process with transfer function l/2 s . The controller proposed to be used in an integral controller with transfer function 1/ T 1 s . 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. | |
| 63. |
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 | |
| 64. |
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 | |
| 65. |
__________ 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 | |
| 66. |
The second order system with the transfer function has a damping ratio of |
| A. | 2.0 |
| B. | 0.5 |
| C. | 1.0 |
| D. | 4.0 |
| Answer» C. 1.0 | |
| 67. |
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) | |
| 68. |
For an input forcing function, X ( t ) = 2 t 2 , the Laplace transform of this function is |
| A. | 2/ s 2 |
| B. | 4/ s 2 |
| C. | 2/ s 3 |
| D. | 4/ s 3 |
| Answer» E. | |
| 69. |
A proportional controller with a gain of K c is used to control a first order process. The offset will increase, if |
| A. | K c is reduced. |
| B. | K c is increased. |
| C. | integral control action is introduced. |
| D. | derivative control action is introduced. |
| Answer» B. K c is increased. | |
| 70. |
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 | |
| 71. |
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple. |
| A. | chromel-alumel |
| B. | iron-constantan |
| C. | platinum-platinum/rhodium |
| D. | none of these. |
| Answer» C. platinum-platinum/rhodium | |