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What is the formula of the width of fan?
d Explanation: The area of outlet opening and the outside diameter is calculated. After fixing the coefficient of utilization and on substituting the width of fan is obtained.
d
See lessExplanation: The area of outlet opening and the outside diameter is calculated. After
fixing the coefficient of utilization and on substituting the width of fan is obtained.
What is the formula for the area of outlet opening?
a Explanation: The maximum air passage per second along with the peripheral speed is calculated. On substitution the area of outlet opening is obtained
a
See lessExplanation: The maximum air passage per second along with the peripheral speed is
calculated. On substitution the area of outlet opening is obtained
What is the range of the difference of air temperature at inlet and outlet?
c Explanation: The difference of air temperatures at inlet and outlet has a minimum value of 120C. The difference of air temperatures at inlet and outlet has a maximum value of 160C
c
See lessExplanation: The difference of air temperatures at inlet and outlet has a minimum value
of 120C. The difference of air temperatures at inlet and outlet has a maximum value of
160C
What is the formula for the volume of air?
a Explanation: The losses in kW is calculated along with the difference of air temperatures at inlet and outlet. On substitution the volume of air can be obtained
a
See lessExplanation: The losses in kW is calculated along with the difference of air temperatures
at inlet and outlet. On substitution the volume of air can be obtained
How many data are required for the design of fan?
c Explanation: There are 3 data required in the design of fan. They are outside diameter of fan, volume of air, hydrodynamic resistance
c
See lessExplanation: There are 3 data required in the design of fan. They are outside diameter of
fan, volume of air, hydrodynamic resistance
What factor/factors are required to evaluate the hydrodynamic resistance?
d Explanation: The hydrodynamic resistance is calculated from the hydrodynamic coefficients. It is also calculated from the area of cross section
d
See lessExplanation: The hydrodynamic resistance is calculated from the hydrodynamic
coefficients. It is also calculated from the area of cross section
What is the range of the coefficients of hydrodynamic resistances for the rounded edges at inlet?
a Explanation: The coefficients of hydrodynamic resistances are used in the calculation of the total head. For rounded edges the range is about 12-20 * 10-3 .
a
See lessExplanation: The coefficients of hydrodynamic resistances are used in the calculation of
the total head. For rounded edges the range is about 12-20 * 10-3
.
What is the range of the coefficients of hydrodynamic resistances for the rectangular edges at inlet?
b Explanation: The coefficients of hydrodynamic resistances are used in the calculation of the total head. For rectangular edges the range is about 30 * 10-3
b
See lessExplanation: The coefficients of hydrodynamic resistances are used in the calculation of
the total head. For rectangular edges the range is about 30 * 10-3
What is the range of the coefficients of hydrodynamic resistances for the protruding edges at inlet?
b Explanation: The coefficients of hydrodynamic resistances are used in the calculation of the total head. For protruding edges the range is about 40-60 * 10
b
See lessExplanation: The coefficients of hydrodynamic resistances are used in the calculation of
the total head. For protruding edges the range is about 40-60 * 10
What are the ventilating parts in the ventilating circuits?
d Explanation: There are various ventilation parts provided in the ventilation circuits. They are sharp or projecting inlet edges, inlet corners, variations in cross-sections of air paths
d
See lessExplanation: There are various ventilation parts provided in the ventilation circuits. They
are sharp or projecting inlet edges, inlet corners, variations in cross-sections of air paths