MCQs Gate - Chemical Engineering

1. A box containing 10 identical compartments has 6red balls and 2 blue balls. If each compartment can hold only one ball, then the number of different possible arrangements are
(a) 1026                                        
(b) 1062
(c) 1260                         
(d) 1620                                                             
Ans(c)
2. If the temperature of Saturated water is increased infinitesimally at constant entropy, the resulting state of water will be
(a) Liquid
(b) Liquid- vapor coexistence
(c) Saturated vapor
(d) Solid           
Ans(b)
3. For an exothermic reversible reaction , which one of the following correctly describes the dependence of the equilibrium constant (K) with temperature(T) and pressure(P)?
(a) K is independent of T and P
(b) K increases with an increase in T and P
(c) K increases with T and decrease with  P
(d) K decreases with an increase in T and is independent of   P         
Ans(d)
4. Water is flowing under laminar conditions in a pipe of length L. If the diameter of the pipe is doubled, for a constant volumetric flow rate, the pressure drop across the pipe
(a) Decreases 2 times
(b) Decreases 16 times  
(c) Increases 2 times
(d) Increases 16 times                                   
Ans(b)
5. The local velocity of a fluid along a streamline can be measured by
(a) Pitot tube                                             
(b) Venturi meter
(c) Rotameter                                            
(d) Orifice meter                                     
Ans(a)
6. For heat transfer across a solid-fluid interface, which one of the following statements is NOT true when the Biot number is very small compared to 1?
(a)Conduction resistance in the solid is very small compared to convection resistance in the fluid
(b) Temperature profile within the solid is nearly uniform
(c) Temperature drop in the fluid is significant
(d) Temperature drop in the solid is significant   
Ans(d)
7. In the McCabe –Thiele diagram, if the x-coordinate of the point of intersection of the a- line and the vapor-liquid equilibrium curve is greater than the x-coordinate of the feed point, then the quality of the feed is
(a)super-heated vapor
(b) liquid below bubble point
(c) saturated vapor
(d) saturated liquid                   
Ans(b)
8. The half-life of an nth order reaction in a batch reactor depends on
(a) only the rate constant
(b) only the rate constant and the order of the reaction
(c) only the rate constant and the initial reactant concentration
(d) the rate constant, the initial reactant concentration, and the order of the reaction           
Ans(d)
9.  In a petroleum refining, catalytic reforming is used to convert
(a) Paraffins and naphthenes to aromatics
(b) Paraffins to hydrogen and carbon monoxide
(c)  Gas oil to diesel and gasoline 
(d) light olefins to gasoline     
Ans(a)
10. A thermometer initially at 100℃ is dipped at  into an oil bath, maintained at 150℃. If the recorded temperature is 130℃ after 1 minute, then the time constant of thermometer (in min) is
(a) 1.98                                
(b) 1.35
(c) 1.26                                 
(d)1.09                                                
Ans(d)
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