chemical engineering MCQs – Page 142

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
2821. A catalyst promoter_________________?
comments icon0

A. All A., B. and C.

B. Itself has very high activity

C. Acts as a catalyst support

D. Improves the activity of a catalyst
2822. A catalyst in a chemical reaction____________________?
comments icon0

A. Alters the reaction mechanism

B. Increases the frequency of collisions of reacting species

C. All A., B. and C.

D. Decreases the activation energy

2823. For the irreversible elementary reactions in parallel as shown in the bellow figure, the rate of disappearance of X is equal to_______________?
comments icon0

A. CA (K1 + K2)/2

B. CA . K1/2

C. CA (K1 + K2)

D. CA . K2/2

2824. A catalyst is said to be a negative catalyst, if it ___________________?
comments icon0

A. Reduces the value of equilibrium constant

B. Retards the rate of reaction

C. Does not initiate the reaction

D. All A., B. and C.

2825. What is the maximum possible value of FR(mole/sec.) ?
comments icon0
A. 2/3

B. 3-Jan

C. 2-Jan

D. 2

2826. The dispersion number of perfect mixed flow is__________________?
comments icon0

A. < 2100

B. > 150

C. 0

D. ?
2827. What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?
comments icon0

A. Second

B. Third

C. First

D. Zero

2828. The gas phase reaction 2A ? B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is _______________________?
comments icon0
A. 5/8

B. 3-Feb

C. 3-Jan

D. 8-Mar

2829. Arrhenius equation represents graphically the variation between the ______________ and temperature?
comments icon0
A. Rate constant

B. Frequency factor

C. Rate of reaction

D. Activation energy

2830. With increase in temperature, the rate constant obeying Arrhenius equation____________________?
comments icon0

A. Can either increase or decrease; depends on the frequency factor

B. Decreases exponentially

C. Decreases

D. Increases

2831. When a high liquid hold up is required in a reactor for gas liquid reaction, use ______________ column?
comments icon0

A. Packed

B. Spray

C. Tray

D. Bubble
2832. The value of Steric factor P in the equation k = PZeE/RT usually ranges from ______________________?
comments icon0
A. 1.0 to 10-8

B. None of these

C. 1.1 to 102

D. 0.1 to 0.9

2833. Exposure of a photographic plate to produce a latent image is an example of _______________ reaction?
comments icon0

A. Very slow

B. Very fast

C. Photochemical

D. Both B. and C.
2834. For every 10C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70C, the rate of reaction increases ______________ times?
comments icon0
A. 16

B. 8

C. 12

D. 32

2835. For a tubular reactor with space time ? and residence time ?, the following statement holds good ?
comments icon0

A. ? = ?, for a non-isothermal reactor

B. ? = ?, when the fluid density changes in the reactor

C. ? = ?, for an isothermic tubular reactor in which the density of the process fluid is constant

D. ? and ? are always equal

2836. With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will________________?
comments icon0
A. Increase

B. Decrease

C. Remain same

D. Data in insufficient; cant be predicted

2837. Fractional conversion _____________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ? 2NH3?
comments icon0

A. Unpredictable from the data

B. Decreases

C. Remains unchanged

D. Increases
2838. A reactor is generally termed as an autoclave, when it is a_____________________?
comments icon0

A. Atmospheric pressure tank reactor

B. High pressure tubular reactor

C. Atmospheric pressure CSTR

D. High pressure batch reactor
2839. Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 101.17 the KP for the reaction CO + H2O = CO2 + H2 is __________________?
comments icon0

A. 103.01

B. 100.67

C. 10-3.01

D. 10-0.67

2840. The enzyme which can catalyse the conversion of glucose to ethyl alcohol is ___________________?
comments icon0

A. Maltase

B. Zymase

C. Invertase

D. Diastase