Mechanical Engineering

Apparent current efficiency is due to which of the following factors?

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Question:

Apparent current efficiency is due to which of the following factors?

A.

choice of wrong valence

B.

passivation of anodic surface

C.

gas evolution at anode

D.

all of the mentioned

Answer» d. all of the mentioned

Note: The above multiple-choice question is for all general and Competitive Exams in India. 

State whether the following statement is true or false about electrolyte in ECM. “Machinability in ECM is enhanced, when electrolyte is heated.”

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Question:

State whether the following statement is true or false about electrolyte in ECM. “Machinability in ECM is enhanced, when electrolyte is heated.”

A.

true

B.

false

Answer» a. true

Note: The above multiple-choice question is for all general and Competitive Exams in India. 

What is Mach number?

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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

Note: The above multiple-choice question is for all general and Competitive Exams in India. 

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?

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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

Note: The above multiple-choice question is for all general and Competitive Exams in India. 

The Prandtl Number approximates

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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

Note: The above multiple-choice question is for all general and Competitive Exams in India.