# GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering: Questions 123 - 126 of 170

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## Question 123

Appeared in Year: 2015

### Question

In a slab rolling operation, the maximum thickness reduction is given by , where is the radius of the roll and is the coefficient of friction between the roll and the sheet. If , the maximum angle subtended by the deformation zone at the center of the roll (bite angle in degrees) is

## Question 124

Appeared in Year: 2015

### Question

MCQ▾

The solidification time of a casting is proportional to , where V is the volume of the casting and A is the total casting surface area losing heat. Two cubes of same material and size are cast using sand casting process. The top face of one of the cubes is completely insulated. The ratio of the solidification time for the cube with top face insulated to that of the other cube is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 125

### Question

MCQ▾

Within a boundary layer for a steady incompressible flows the Bernoulli equation

### Choices

Choice (4)Response

a.

Holds because the flow is incompressible

b.

Holds because the flow is steady

c.

Holds because the flow is transitional

d.

Does not hold because the flow is viscous

## Question 126

Appeared in Year: 2015