Engineering Mechanics | Mechanical Engineering

A machine having an efficiency less than 50%, is known as

Byadmin September 14, 2022

Question: A machine having an efficiency less than 50%, is known as
[A].

reversible machine

[B].

non-reversible machine

[C].

neither reversible nor non-reversible machine

[D].

ideal machine

Answer: Option B

Explanation:

No answer description available for this question.

Engineering Mechanics

Center of gravity of a solid cone lies on the axis at the height _____________________?

Center of gravity of a solid cone lies on the axis at the height _____________________?

A. one-fourth of the total height above base
B. one-third of the total height above base
C. one-half of the total height above base
D. three-eighth of the total height above the base
E. none of the above

Read More Center of gravity of a solid cone lies on the axis at the height _____________________?
Engineering Mechanics | Mechanical Engineering

The angle between two forces when the resultant is maximum and minimum respectively are

Question: The angle between two forces when the resultant is maximum and minimum respectively are
[A].

0° and 180°
[B].
180° and 0°
[C].
90° and 180°
[D].
90° and 0°

Answer: Option A

Explanation:

No answer description available for this question.

Read More The angle between two forces when the resultant is maximum and minimum respectively are
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

During adiabatic saturation process on unsaturated air __________ remains constant.

Question: During adiabatic saturation process on unsaturated air __________ remains constant.
[A].

relative humidity
[B].
dew point temperature
[C].
dry bulb temperature
[D].
wet bulb temperature

Answer: Option D

Explanation:

No answer description available for this question.

Read More During adiabatic saturation process on unsaturated air __________ remains constant.
Hydraulics and Fluid Mechanics | Mechanical Engineering

A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid.

Question: A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid.
[A].

True
[B].
False

Answer: Option A

Explanation:

No answer description available for this question.

Read More A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid.
Hydraulics and Fluid Mechanics | Mechanical Engineering

In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

Question: In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
[A].

less than
[B].
more than

Answer: Option A

Explanation:

No answer description available for this question.

Read More In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
Hydraulic Machines | Mechanical Engineering

A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)

Question: A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Read More A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)

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