1 In PERT analysis a critical activity has
A) maximum Float
B) zero Float
C) maximum Cost
D) minimum Cost
Answer : (B)
2 Environment friendly refrigerant R134a is used in the new generation domestic refrigerators. Its chemical formula is
A) CH C1 F2
B) C2 C13 F3
C) C2 C12 F4
D) C2 H2 F4
Answer : (D)
3
A solid cylinder (surface 2) is located at the centre of a hollow
sphere (surface 1). The diameter of the sphere is 1m, while the
cylinder has a diameter and length of 0.5 m each. The radiation
configuration factor F11 is
A) 0.375
B) 0.625
C) 0.75
D) 1
Answer : (C)
4
For a fluid flow through a divergent pipe of length L having inlet and
outlet radii of R1 and R2 respectively and a constant flow rate of Q,
assuming the velocity to be axial and uniform at any cross-section, the
acceleration at the exit is
A) 2Q(R1 - R2) p LR23
B) 2Q2 (R1 - R2) p LR23
C) 2Q2 (R1 - R2) p2LR25
D) 2Q2 (R2 - R1) p2LR25
Answer : (C)
5
An incompressible fluid (kinematic viscosity, 7.4 x 10-7 m2/s, specific
gravity, 0.88) is held between two parallel plates. If the top plate is
moved with a velocity of 0.5 m/s while the bottom one is held
stationary, the fluid attains a linear velocity profile in the gap of
0.5 mm between these plates; the shear stress in Pascals on the surface
of top plate is
A) 0.651 x 10-3
B) 0.651
C) 6.51
D) 0.651 x 103
Answer : (B)
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