Month: February 2019

A space velocity of 5 hr-1 means that ___________________?

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A space velocity of 5 hr-1 means that ___________________?

A. Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
B. After every 5 hours, reactor is being filled with the feed
C. Cent per cent conversion can be achieved in at least 5 hours
D. A fixed conversion of a given batch of feed takes 5 hours

The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?

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The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?

A. 400
B. 500
C. 600
D. 1000

For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?

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For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?

A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either A., B. or C.

Which provincial police of Pakistan has launched the Mobile App with the name of Police4u?

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Which provincial police of Pakistan has launched the Mobile App with the name of Police4u?

A. Sindh Police
B. kpk police
C. Punjab Police
D. Balochistan police

The Sindh Police on Jan 14 2019 formally inaugurated a new mobile application to facilitate the people of southeastern Pakistani province.
Additional Inspector General of Police (AIGP) Karachi, Dr Ameer Ahmed Sheikh and other senior officers of Sindh Police attended the launching ceremony in Karachi.
The mobile application can be downloaded from Google App Playstore
 

The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reactions with low activation energy are ________________?

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The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reactions with low activation energy are ________________?

A. Always irreversible
B. Insensitive to temperature changes
C. Mostly irreversible
D. Highly temperature sensitive