MCQOPTIONS
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MCQOPTIONS
This section includes 5314 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2451. |
Which of the following is not a valid Date and Time data type? |
| A. | date |
| B. | time |
| C. | datestamp |
| D. | timestamp |
| Answer» D. timestamp | |
| 2452. |
If V1 is 5V and resistance R1 is 5KΩ and the cut-in voltage of the diode is 0.7V, what will be the voltage Vout across the diode? Take reverse saturation current as 10-8A and operating temperature as 25°C. |
| A. | 0V |
| B. | -4.5V |
| C. | -5V |
| D. | -3.2V |
| Answer» D. -3.2V | |
| 2453. |
The input voltage V1 of the circuit the circuit is 2V and resistor has a resistance of 1KΩ. The cut-in voltage of the silicon diode is 0.7V and the reverse saturation current is 10-8A. The temperature at which diode operates is 30°C. The voltage across resistor when diode starts conducting is _________________ |
| A. | 0.7V |
| B. | 1.3V |
| C. | 0.306V |
| D. | 1.7V |
| Answer» C. 0.306V | |
| 2454. |
How much times reverse saturation current will increase if temperature increases 15oC? |
| A. | 2.52 |
| B. | 4.62 |
| C. | 4.12 |
| D. | 2.82 |
| Answer» E. | |
| 2455. |
The reverse saturation current of a diode at 25°C is 1.5 x 10-9A. What will be the reverse current at temperature 30°C? |
| A. | 3 x 10-9A |
| B. | 2 x 10-9A |
| C. | 2.12 x 10-9A |
| D. | 1.5 x 10-9A |
| Answer» D. 1.5 x 10-9A | |
| 2456. |
If the temperature increases 10°C, the ratio of final reverse saturation current to initial reverse saturation current is _______ |
| A. | 1 |
| B. | 2 |
| C. | 1.5 |
| D. | 3 |
| Answer» C. 1.5 | |
| 2457. |
If the current I is 2mA then find the temperature at which diode operates. The cut-in voltage of diode is 0.6V. The reverse saturation current of diode is 10-9A. Resistance R is 1.3KΩ. |
| A. | 45.85°C |
| B. | 50.47°C |
| C. | 60.26°C |
| D. | 56.89°C |
| Answer» B. 50.47°C | |
| 2458. |
Find the current Ix if the voltage across the diode is 0.5V. The reverse saturation current of diode 10-11A, the cut-in voltage of diode is 0.6V. Assume that the temperature at which diode operates is 25°C. The resistance R1=2KΩ. |
| A. | 3.97mA |
| B. | 4.51mA |
| C. | 2.45mA |
| D. | 3.05mA |
| Answer» E. | |
| 2459. |
The current Ix in the circuit is 1mA then find the voltage across diode D1. The resistance R1 is 1KΩ. Assume the reverse saturation current is 10-9A. Voltage across resistor in this condition was 0.4V. Take VT of diode as 0.026V. |
| A. | 2.3mA |
| B. | 3.2mA |
| C. | 5.2mA |
| D. | 4.6mA |
| Answer» D. 4.6mA | |
| 2460. |
Find voltage VOUT if the reverse saturation current of the diode is 1.1×10-8A, the cut-in voltage of diode is 0.6V and assume the temperature as 25oC. |
| A. | 0.235V |
| B. | 0.3148V |
| C. | 0.456V |
| D. | 0.126V |
| Answer» C. 0.456V | |
| 2461. |
Find the current I if both diodes are identical. Voltage V = 0.8V and let the reverse saturation current be 10-9A. |
| A. | 4.8mA |
| B. | 3.2mA |
| C. | 2.5mA |
| D. | 7mA |
| Answer» B. 3.2mA | |
| 2462. |
SCC is measured using the _________ |
| A. | Picat’s apparatus |
| B. | Slump-flow test |
| C. | Slump test |
| D. | Standard Consistency Test |
| Answer» C. Slump test | |
| 2463. |
SCC has __________ deformability. |
| A. | Low |
| B. | High |
| C. | Medium |
| D. | 75% |
| Answer» C. Medium | |
| 2464. |
SCC has __________ yield stress. |
| A. | Low |
| B. | High |
| C. | Medium |
| D. | 75% |
| Answer» B. High | |
| 2465. |
What will be the value of $a and $b after the function call in the following PHP code? |
| A. | a is 3 and b is 4 |
| B. | a is 4 and b is 3 |
| C. | Both are 3 |
| D. | Both are 4View Answer |
| Answer» C. Both are 3 | |
| 2466. |
If $a = 12 what will be returned when ($a == 12) ? 5 : 1 is executed? |
| A. | 12 |
| B. | 1 |
| C. | Error |
| D. | 5 |
| Answer» E. | |
| 2467. |
Which of the looping statements is/are supported by PHP? |
| A. | i) and ii) |
| B. | i), ii) and iii) |
| C. | i), ii), iii) and iv) |
| D. | Only iv)View Answer |
| Answer» D. Only iv)View Answer | |
| 2468. |
If a condenser and evaporator temperatures are ‘X’ K and 100 K respectively, and reverse Carnot C.O.P is 2.5 then find out the ‘X’. |
| A. | 100 K |
| B. | 150 K |
| C. | 350 K |
| D. | 200 K |
| Answer» D. 200 K | |
| 2469. |
The C.O.P of a reverse Carnot cycle doesn’t depend on which of the following? |
| A. | Moisture |
| B. | Evaporator temperature |
| C. | Condenser temperature |
| D. | Work done |
| Answer» B. Evaporator temperature | |
| 2470. |
The C.O.P for reverse Carnot refrigerator is 2. The ratio of highest temperature to lowest temperature will be _____ |
| A. | 4 times |
| B. | 3 times |
| C. | 1/2 times |
| D. | 1/3 times |
| Answer» E. | |
| 2471. |
In general the ratio of lowest to highest temperature with respect to C.O.P. can be denoted by _________ |
| A. | C.O.P + 1 = Ratio of temperature |
| B. | C.O.P/2 = Ratio of temperature |
| C. | C.O.P + 4 = Ratio of temperature |
| D. | C.O.P + 2 = Ratio of temperature |
| Answer» B. C.O.P/2 = Ratio of temperature | |
| 2472. |
The C.O.P for reverse Carnot refrigerator is 6. The ratio of lowest temperature to highest temperature will be _____ |
| A. | twice |
| B. | three times |
| C. | four times |
| D. | seven times |
| Answer» E. | |
| 2473. |
If a condenser and evaporator temperatures are 312 K and X K respectively, and C.O.P. is given as 5 then find the value of X. |
| A. | 52 |
| B. | 65 |
| C. | 78 |
| D. | 82 |
| Answer» B. 65 | |
| 2474. |
If a condenser and evaporator temperatures are 225 K and 100 K respectively, then reverse Carnot C.O.P is _________ |
| A. | 0.5 |
| B. | 1.5 |
| C. | 1.25 |
| D. | 1.75 |
| Answer» D. 1.75 | |
| 2475. |
Find the Relative C.O.P. of a refrigeration system if the work input is 100 KJ/kg and refrigeration effect produced is 250 KJ/kg of refrigerant flowing. Also Theoretical C.O.P. is 3. |
| A. | 0.65 |
| B. | 0.80 |
| C. | 0.83 |
| D. | 0.91 |
| Answer» D. 0.91 | |
| 2476. |
What is the C.O.P. of a refrigeration system if the work input is 40 KJ/kg and work output is 80 KJ/kg and refrigeration effect produced is 130 KJ/kg of refrigerant flowing. |
| A. | 3 |
| B. | 3.25 |
| C. | 2.25 |
| D. | 3.75 |
| Answer» C. 2.25 | |
| 2477. |
Efficiency of the Refrigerator is _________ to the C.O.P of refrigerator. |
| A. | inversely proportional |
| B. | equal |
| C. | independent |
| D. | directly proportional |
| Answer» D. directly proportional | |
| 2478. |
__________ uses an intermediate fluid or solid store to hold heat. |
| A. | Shell and tube Heat exchanger |
| B. | Plate heat exchanger |
| C. | Double tube heat exchanger |
| D. | Adiabatic wheel heat exchanger |
| Answer» E. | |
| 2479. |
__________is used for horizontal thermosyphon reboilers. |
| A. | G type |
| B. | A type |
| C. | C type |
| D. | Y type |
| Answer» B. A type | |
| 2480. |
_________ is used as rear header in a U-Tube heat exchanger. |
| A. | M type |
| B. | A type |
| C. | U type |
| D. | D type |
| Answer» B. A type | |
| 2481. |
_____________ consists of a single tube mounted inside another tube. |
| A. | Shell and tube Heat exchanger |
| B. | Plate heat exchanger |
| C. | Double tube heat exchanger |
| D. | Plate fin heat exchanger |
| Answer» D. Plate fin heat exchanger | |
| 2482. |
Which of the following statements about Printed circuit heat exchanger are correct?Statement 1: Printed circuit heat exchanger is an example for direct heat exchanger.Statement 2: It has high heat transfer surface area per unit volume of the exchanger. |
| A. | True, False |
| B. | True, True |
| C. | False, True |
| D. | False, False |
| Answer» D. False, False | |
| 2483. |
What type of heat exchanger is used in cryogenic applications? |
| A. | Shell and tube Heat exchanger |
| B. | Plate heat exchanger |
| C. | Finned tube heat exchanger |
| D. | Plate fin heat exchanger |
| Answer» E. | |
| 2484. |
What are the examples of direct heat exchangers? |
| A. | Shell and tube Heat exchanger, Plate heat exchangers |
| B. | Steam injectors, plate heat exchangers |
| C. | Cooling towers, Plate heat exchangers |
| D. | Steam injectors, cooling towers |
| Answer» E. | |
| 2485. |
What are the examples of indirect heat exchangers? |
| A. | Shell and tube Heat exchanger, Plate heat exchangers |
| B. | Steam injectors, plate heat exchangers |
| C. | Cooling towers, Plate heat exchangers |
| D. | Steam injectors, cooling towers |
| Answer» B. Steam injectors, plate heat exchangers | |
| 2486. |
Air Cooled Heat Exchangers are used in ___________ |
| A. | oil refineries |
| B. | vehicles |
| C. | food industries |
| D. | dairy industries |
| Answer» C. food industries | |
| 2487. |
What type of heat exchanger used in oil refineries? |
| A. | Shell and tube Heat exchanger |
| B. | Plate heat exchanger |
| C. | Finned tube heat exchanger |
| D. | Plate fin heat exchanger |
| Answer» B. Plate heat exchanger | |
| 2488. |
The positioning of nucleosome is beneficial. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2489. |
With respect to remodeling complex of nucleosome, which of the following is not true? |
| A. | Does not require ATP |
| B. | Favors sliding of histone |
| C. | Favors transfer of histone |
| D. | Favors remodeling of histone |
| Answer» B. Favors sliding of histone | |
| 2490. |
Which of the following is not a characteristic of the nuclear scaffold? |
| A. | Associated with loops of 40 – 90 kb |
| B. | Topoisomerase I |
| C. | SMC protein |
| D. | Proteinacious in nature |
| Answer» C. SMC protein | |
| 2491. |
The histone tails stabilize the 30 nm fibre by interacting with adjacent nucleosomes. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2492. |
What marks the difference between the solenoid and the zig-zag models of 30 nm fibres? |
| A. | Linker histone molecule |
| B. | Linker DNA |
| C. | Nucleosome structure |
| D. | 10 nm fibre |
| Answer» C. Nucleosome structure | |
| 2493. |
The distinct zig-zag appearance of the chromatin fibre is due to ____________ |
| A. | Nucleosome |
| B. | Histone H1 |
| C. | Histone core |
| D. | Linker DNA |
| Answer» C. Histone core | |
| 2494. |
Histone H1 binds two DNA helices. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2495. |
Which log represents the type of strata existing at different depths and encountered during digging or boring of the wells? |
| A. | Well logs |
| B. | Resistivity logs |
| C. | Radiometric logs |
| D. | Sonic logs |
| Answer» B. Resistivity logs | |
| 2496. |
Which of the following pumps is also used for testing or development of wells? |
| A. | Vertical turbine pump |
| B. | Submersible motor pump |
| C. | Jet pump |
| D. | Airlift pump |
| Answer» E. | |
| 2497. |
Reversing the direction of flow by surging the well does help in removing the bridging. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2498. |
Which of the following gives an indication of the chemical quality of the groundwater? |
| A. | Geological logs |
| B. | Resistivity logs |
| C. | Sonic logs |
| D. | Thermal logs |
| Answer» C. Sonic logs | |
| 2499. |
The amount of water required from wells to mature a similar crop is more than that required in canal irrigation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2500. |
Which of the following pump can effectively lift water under the maximum suction head of 6 to 8 meters? |
| A. | A single-stage centrifugal pump |
| B. | Submersible pumps |
| C. | Turbine pumps |
| D. | Jet pumps |
| Answer» B. Submersible pumps | |