Question:

What is Mach number?

A.

speed of object * speed of sound

B.

speed of object /speed of sound

C.

speed of object + speed of sound

D.

speed of object- speed of sound

Answer» b. speed of object /speed of sound

Question:

A mass of 4kg rests on a horizontal plane. The plane is gradually inclined until at an angle θ= 15° with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface?

A.

0.814

B.

0.27

C.

1.5

D.

3.5

Answer» b. 0.27

Question:

The evaporation process is a

A.

constant volume reversible process

B.

constant pressure reversible process

C.

adiabatic throttling process

D.

reversible adiabatic process

Answer» b. constant pressure reversible process

Question:

The Prandtl Number approximates

A.

momentum diffusivity to thermal diffusivity

B.

thermal diffusivity to momentum diffusivity

C.

shear stress to thermal diffusivity

D.

thermal diffusivity to kinematic viscosity

Answer» a. momentum diffusivity to thermal diffusivity

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:

Compounding efficiency at low speed.

A.

decrease

B.

increase

C.

maximizes

D.

none of the mentioned

Answer» b. increase

Question:

What is the function of Blow down valve of a boiler?

A.

to remove sludge

B.

to build sediments

C.

to remove flue gas

D.

to remove ash

Answer» a. to remove sludge

Question:

Heat exchangers are classified into how many categories?

A.

1

B.

2

C.

3

D.

4

Answer» d. 4

Question:

How many level indicators are there in the water level indicator of a boiler?

A.

1

B.

2

C.

3

D.

4

Answer» b. 2

Question:

Why is wet compression not preferred?

A.

the liquid refrigerant can be trapped in the head of cylinder

B.

this may damage the valves or cylinder head

C.

liquid refrigerant can wash away the lubricating oil thus accelerating wear

D.

all of the mentioned

Answer» d. all of the mentioned