Question:

To refrain from separation in subsonic nozzles, the expansion angle must not be more than            

A.

10 degrees

B.

20 degrees

C.

30 degrees

D.

40 degrees

Answer» a. 10 degrees

Question:

Friction can be increased by                        

A.

using air cushion

B.

lubricants

C.

using sand

D.

using ball bearings

Answer» c. using sand

Question:

When the pressure chamber is big, the flow velocities are                    

A.

large

B.

negligible

C.

constant

D.

increasing

Answer» b. negligible

Question:

Which of the following is not an example of recuperators type heat exchanger?

A.

automobile radiators

B.

condensers

C.

chemical factories

D.

oil heaters for an aero plane

Answer» c. chemical factories

Question:

In how many categories heat exchangers are classified on the basis of direction of flow of fluids?

A.

4 categories

B.

3 categories

C.

2 categories

D.

1 categories

Answer» b. 3 categories