Mechanical Engineering Mcqs Practice Test

Question 1

The critical pressure at which latent heat of vaporisation is zero is________________?

Accepted Answer

A. 225.65 kgf/cm2

Question 2

For water, at pressures below atmospheric___________________?

Accepted Answer

A. melting point rises slightly and boiling point drops markedly

Question 3

The saturation temperature of steam with increase in pressure increases____________________?

Accepted Answer

B. rapidly first and then slowly

Question 4

Superheating of steam is done at_________________?

Accepted Answer

C. constant pressure

Question 5

Stoichiometric quantity of air is the___________________?

Accepted Answer

B. air required for complete combustion of fuel with no excess air

Question 6

The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?

Accepted Answer

C. 0.6 to 0.8 kg

Question 7

The specific volume of steam with increase in pressure decreases_____________________?

Accepted Answer

C. rapidly first and then slowly

Question 8

If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton’s law, the pressure in condenser is equal to__________________?

Accepted Answer

C. Pa+P

Question 9

Heating of dry steam above saturation temperature is known as_____________________?

Accepted Answer

B. superheating

Question 10

Carbonation of coal is the process of________________________?

Accepted Answer

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Question 11

The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?

Accepted Answer

A. less

Question 12

At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?

Accepted Answer

B. 273.16°K

Question 13

Pick up false statement?

Accepted Answer

D. In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied

Question 14

Pick up the wrong statement?

Accepted Answer

A. aluminium in steel results in excessive grain growth

Question 15

Choose the wrong statement?

Accepted Answer

D. he vertical component passes through the center of pressure of the volume

Question 16

Choose the wrong statement ?

Accepted Answer

D. Center of buoyancy is located above the center of gravity of the displaced liquid v

Question 17

Choose the wrong statement ?

Accepted Answer

E. All floating bodies are stable

Question 18

Choose the wrong statement?

Accepted Answer

D. Viscosity of liquids is appreciably affected by change in pressure

Question 19

Choose the correct relationship ?

Accepted Answer

B. dynamicviscosity = kinematicviscosity x density

Question 20

Select the correct statement?

Accepted Answer

B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level