Fan Design MCQs : This section focuses on the "Fan Design". These Multiple Choice Questions (MCQs) should be practiced to improve the Fan Design skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
How many data are required for the design of fan?
A. 3
B. 4
C. 5
D. 6
Question 2
How many steps are required in the design of the fan?
A. 7
B. 8
C. 9
D. 6
Question 3
What are the ventilating parts in the ventilating circuits?
A. sharp or projecting inlet edges
B. inlet corners
C. variations in cross-sections of air paths
D. sharp or projecting inlet edges, inlet corners, variations in cross-sections of air paths
Question 4
What factor/factors are required to evaluate the hydrodynamic resistance?
A. area of cross section
B. hydrodynamic coefficients
C. area of cross section or hydrodynamic coefficients
D. area of cross section and hydrodynamic coefficients
Question 5
What is the formula for the area of outlet opening?
A. area of outlet opening = maximum air passing per second / 0.42 * peripheral speed
B. area of outlet opening = maximum air passing per second * 0.42 * peripheral speed
C. area of outlet opening = maximum air passing per second * 0.42 / peripheral speed
D. area of outlet opening = 1/maximum air passing per second * 0.42 * peripheral speed
Question 6
What is the formula for the fundamental relationship for the design of the ventilation system?
A. head of air inside the machine = hydrodynamic resistance * volume of air passing2
B. head of air inside the machine = hydrodynamic resistance + volume of air passing2
C. head of air inside the machine = hydrodynamic resistance – volume of air passing2
D. head of air inside the machine = hydrodynamic resistance / volume of air passing2
Question 7
What is the formula for the maximum air passing per second at maximum efficiency?
A. maximum air passing = 2 * volume of air passing per second
B. maximum air passing = volume of air passing per second
C. maximum air passing = 2 / volume of air passing per second
D. maximum air passing = volume of air passing per second / 2
Question 8
What is the formula for the number of blades?
A. number of blades = 3.14 * outside diameter * (1.25 – 1.5)* width of fan
B. number of blades = 3.14 / outside diameter * (1.25 – 1.5)* width of fan
C. number of blades = 3.14 * outside diameter / (1.25 – 1.5)* width of fan
D. number of blades = 3.14 * outside diameter * (1.25 – 1.5) / width of fan
Question 9
What is the formula for the total head produced?
A. total head produced = ∑ coefficient of hydrodynamic resistance + volume of air passing per second2
B. total head produced = ∑ coefficient of hydrodynamic resistance – volume of air passing per second2
C. total head produced = ∑ coefficient of hydrodynamic resistance * volume of air passing per second2
D. total head produced = ∑ coefficient of hydrodynamic resistance / volume of air passing per second2
Question 10
What is the formula for the volume of air?
A. volume of air = 0.9 * losses in kW / difference of air temperature at inlet and outlet
B. volume of air = 0.9 * losses in kW * difference of air temperature at inlet and outlet
C. volume of air = 0.9 / losses in kW * difference of air temperature at inlet and outlet
D. volume of air = 1 / 0.9 * losses in kW * difference of air temperature at inlet and outlet
Question 11
What is the formula of the width of fan?
A. width of fan = area of outlet opening * 2.88 * outside diameter */ coefficient of utilization
B. width of fan = 1/ area of outlet opening * 2.88 * outside diameter * coefficient of utilization
C. width of fan = area of outlet opening * 2.88 * outside diameter * coefficient of utilization
D. width of fan = area of outlet opening / 2.88 * outside diameter * coefficient of utilization
Question 12
What is the range of the coefficients of hydrodynamic resistances for the protruding edges at inlet?
A. 40-50 * 10-3
B. 40-60 * 10-3
C. 30-50 * 10-3
D. 30-40 * 10-3
Question 13
What is the range of the coefficients of hydrodynamic resistances for the rectangular edges at inlet?
A. 10-20 * 10-3
B. 30 * 10-3
C. 20-30 * 10-3
D. 20-25 * 10-3
Question 14
What is the range of the coefficients of hydrodynamic resistances for the rounded edges at inlet?
A. 12-20 * 10-3
B. 10-20 * 10-3
C. 15-20 * 10-3
D. 12-30 * 10-3
Question 15
What is the range of the difference of air temperature at inlet and outlet?
A. 11-150C
B. 10-130C
C. 12-160C
D. 14-180C