Chemical Engineering Answers

The yp value of (D²− 3D+ 2)y = e^{3x}

A) 1/2 e^{3x}

B) e^{3x}

C) 2e^{3x}. D) 3e^{3x}

The value of 1/D²+3D (2 + 6x) =

A) x

B) x² C) 0 D) 1

Solution of (D³ - 2D² - 3D)y = 0

A) y = C1.₁e^{x} + C₂е^{-x }+ С3.e^{3x} B) y = C1e^x + C₂е^{-x} + С3.e^{-3x}

C) y = C1+C₂е^{-x} + С3.e^{3x}

D) y = C₁+C₂е^{-x} + С3e^{-3x}

If f(x, y) = 1, then the value of ∫∫R 1 dxdy gives

A) 2 * Area of the region R

B) 1/2* Area of the region

C) Area of the region R R

D) 0

If V = x²z²i-2y²z²j+ xy²zk then Curl V at (3,2,1) is

A) 20i + 14k

B)2i + 14k

C)14j+20k

D) 20i + 14j

The unit normal to the surface x² + y² + z² = 3 at (1,1,1) is A)1/√16 (2i+2j+2k) B)1/√3(i+j+ k)

C) 1/√6(i+2j+3k)

D)1/√3(i+2j+2k)

If Ø(x, y, z) = x² - y²-2²-2, then ∇Ø at (2,1,-1) is

A) 4i +2j-2k

B)4i-2j-2k

C) 4i + 2j + 2k

D)4i - 2j +2k

For what kind of solution/mixture we may take DAB=DBA?

Water discharge through a pipe of length 50m and diameter 0.5m at 3m3 /s. For this flow, f = 0.025 . Determine the head loss through the model pipe for a scale ratio of 1:10.

The head on a spillway is 1.5m and the discharge is 100m3 /min. What is the head on the scale model of 1:80? Determine the model discharge.