Q 1. If resistance of the mine gallery is kept constant and P is pressure difference and Q is quantity of air flow, then which of the following is true?
a. P∝Q
b. P∝1/Q
c. P∝Q2
d. P∝Q3
Q 2. What is the unit of Atinkson’s friction factor?
a. Ns2m4
b. Ns2/m8
c. Kg/m3
d. Both a & c
Q 3. Resistance of the mine R varies with area of cross section A in ___________
a. R∝A2
b. R∝1/A2
c. R∝A3
d. R∝1/A3
Q 4. Coefficient of friction of airways depend on
a. Nature of the roughness of the roadways
b. Type of rubbing surface
c. Resistance of the roadway
d. All of them
Q 5. Resistance coefficient depend on
a. Nature of the roughness of the roadways
b. Type of rubbing surface
c. Resistance of the roadway
d. All of them
Q 6. If air density is assumed to be constant, Darcy Weisbach resistance coefficient (λ) varies with Atinkson’s friction factor (K) as
a. K∝1/λ
b. K∝λ
c. K∝1/λ2
d. K∝λ2
Q 7. 1 Weisbach is equal to
a. 1 Kilomurg
b. 9.8 Ns2/m8
c. 164 Atkinsons
d. All of the above