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Consider the following statements in respect of ‘mixers’ 1. Mass batch mixing of ingredients is the most desirable method. 2. Charging all materials into a drum mixer is done ‘at once’. 3. The quantity of material fed into a mixer should be not more than the quantity that can be used in less than 30 minutes after completion of mixing. 4. Reversing mixers have less capacity than tilting mixers. 5. In large mixers, additional time of mixing is allowed. Which of the above statements are correct?
Consider the following statements pertaining to centrifugal pumps: 1. The inlet to the impeller of a centrifugal pump is always axial, while the outlet may be radial or inclined. 2. The impeller may be shrouded on both sides with an eye at the center and vanes curved backward. 3. Impeller of double-entry type has a balanced radial thrust. 4. Un-shrouded and part-shrouded impeller are used only where high efficiency is unimportant. Which of these statements are correct?
If in a city, the maximum daily draft is 25MLD, fire draft is 35MLD and maximum hourly draft is 40MLD, what is the coincident draft?
The maximum harbour depth below lowest low water is generally equal to
(i) loaded draft + 1.2 m when bottom is rock
(ii) loaded draft + 1.8 m when bottom is soft
(iii) loaded draft + 1.2 m when bottom is soft
(iv) loaded draft + 1.8 m when bottom is rock
The important design and operating considerations for Extended-Surface Compact Heat Exchangers are: (1) Both fluids may have high or low heat transfer coefficients (2) As the tubes are very narrow (low DH), the fluid used should not be corrosive as effective cleaning of tubes is not possible. (3) The fluid pressure drop calculation is important as a regulatory method to ensure long life of the tubes. (4) Unlike shell and tube type heat exchangers, these are limited when it comes to operating pressure and temperature.
In the question below are given two statements followed by three conclusions I, II and III. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: No pot is jug. All pots are tubes. Conclusions: I. Some tubes are jugs. II. Some jugs are tubes. III. No jug is tube.
Below are given three statement followed by three conclusions. You have to take the given statement to be true even if they appear to be at variance with commonly known facts, and then decide which of conclusions logically follows from the given statement. For each question, mark out an appropriate answer choice that you think is correct. Statements: Some bulbs are lights. Some tubes are bulbs. No tube is a electronic. Conclusions: I. Some lights are tubes. II. Some electronic are not tubes. III. Some bulbs are not electronic.
Given below are two premises with four conclusions drawn from them. Which of the following conclusions could be validity drawn from the premises? Premises: (i) All fans are tubes (ii) Bulbs are not tubes Conclusions: (A) Fans are not bulbs (B) All tubes are fans (C) Fans are bulbs (D) No tube is bulb Select the correct answer from the options given below:
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of