MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Food Processing Unit Operations knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How can swirling be prevented in agitated vessels? |
| A. | By reducing the power provided |
| B. | By the use of turbines |
| C. | By the use of Baffles |
| D. | By lowering the shaft |
| Answer» D. By lowering the shaft | |
| 2. |
Power consumption of agitators is a function of ________ |
| A. | Impeller used |
| B. | Volumetric flow rate |
| C. | Volumetric flow rate and Kinetic Energy |
| D. | Kinetic Energy |
| Answer» D. Kinetic Energy | |
| 3. |
Name the type of impeller used for agitation of low viscosity fluids, on high speeds? |
| A. | Propeller |
| B. | Concave Blade Impeller |
| C. | Straight blade turbine |
| D. | Paddles |
| Answer» B. Concave Blade Impeller | |
| 4. |
An agitator is selected depending upon the __________ |
| A. | Volume of liquid |
| B. | Height of the tank |
| C. | Power required |
| D. | Fluid viscosity |
| Answer» E. | |
| 5. |
Which one is not the purpose of establishment of agitation in fluids? |
| A. | Suspension of solid particles |
| B. | Blending of solids |
| C. | Blending miscible liquids |
| D. | Promoting heat transfer |
| Answer» C. Blending miscible liquids | |
| 6. |
A flat blade turbine having six blades is centrally installed in a vertical tank. The tank is 6 ft (1.83 m) in diameter; the turbine is 2 ft. (0.61 m) in diameter and is positioned 2 ft (0.61 m) from the bottom of the tank. The turbine blades are 5 in. (127 mm) wide. The tank is filled to a depth of 6 ft (1.83 m) with a solution of 50 percent caustic soda, at 150 F (65.6 C), which has a viscosity of 12 cP and a density of 93.5 lb/ft3 (1498 kg/m3). The turbine is operated at 90 r/min. the tank is baffled. What power will be required to operate the mixer? (Given KL=403680). |
| A. | 2.47 kW |
| B. | 6.05 kW |
| C. | 3.21 kW |
| D. | 4.00 kW |
| Answer» B. 6.05 kW | |
| 7. |
The formula Np= ( frac{P}{n^3Da^5 rho} ) denotes which number in impeller problems? |
| A. | Weber number |
| B. | Froude number |
| C. | Power number |
| D. | Euler Number |
| Answer» D. Euler Number | |
| 8. |
The role of Baffles is to improve mixing and remove stratification during agitation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Which unit operation involves the mechanically induced establishment of a flow pattern in a liquid mixture? |
| A. | Sedimentation |
| B. | Agitation |
| C. | Mixing |
| D. | Crystallization |
| Answer» C. Mixing | |