Test 2

Question 1

η (efficiency)

Answer 1

Power out divided by power in

Question 2

Closed, Deformable System Examples

Answer 2

Piston/cylinder

Question 3

transient open system example

Answer 3

emptying or filling a container

Question 4

Boundary work equation

Answer 4

W_b = integral of P dV

Question 5

The boundary work of a substance in a rigid tank is always zero. True or False

Answer 5

True, The volume is constant meaning the boundary does not move

W = integral from V_1 to V_2 P dV

Question 6

In a closed system, the boundary work of an expanding substance is always
positive.

True or False

Answer 6

True the boundary work is positive when the system expands this is because V_2 grows greater than V_1
W = integral from V_1 to V_2 P dV

Question 7

If an open, steady state system has a single inlet and single outlet for fluid to flow, then the fluid’s volumetric flow rate will always be the same at both the inlet and outlet.

True or False

Answer 7

False

For volumetric flow rate M dot = Q * row

Question 8

Open steady state system examples

Answer 8

Fan, turbine of a jet engine

Question 9

closed isochoric system example

Answer 9

a rigid tank being cooled or heated