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February 2019

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________?

Chemical Engineering Basics /
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________?

A. Range is 15°F
B. Approach is 10°F
C. Both A. & B.
D. Neither A. nor B.

Explanation:
Temperature range (T1 – T2) = 15°F
Temperature approach (T2 – tw) = 10°F
Wet-bulb temperature tw = 70°F

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________? Read More »

Chemical Engineering Basics

The emf of a Deniell cell “Zn | Zn2+ || Cu2+ | Cu” can be increased by_________________?

Chemical Engineering Basics /
The emf of a Deniell cell “Zn | Zn2+ || Cu2+ | Cu” can be increased by_________________?

A. Decreasing the surface area of the electrodes
B. Increasing the concentration of zinc sulphate solution
C. Increasing the surface area of the electrodes
D. Increasing the concentration of copper sulphate solution

The emf of a Deniell cell “Zn | Zn2+ || Cu2+ | Cu” can be increased by_________________? Read More »

Chemical Engineering Basics

In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be_______________?

Chemical Engineering Basics /
In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be_______________?

A. ΔQ = 0, ΔS=0
B. ΔQ = 0, ΔS = +ve
C. ΔQ = 0, ΔS = -ve
D. ΔQ = +ve, ΔS= +ve

In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be_______________? Read More »

Chemical Engineering Basics

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?

Chemical Engineering Basics /
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?

A. 2300 J
B. 4600 J
C. 230 J
D. 2.3 × 106 J

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ? Read More »

Chemical Engineering Basics

The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for ______________ at room temperature ?

Chemical Engineering Basics /
The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for ______________ at room temperature ?

A. Air
B. Water
C. Mercury
D. Alcohol

The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for ______________ at room temperature ? Read More »

Chemical Engineering Basics