Q1:

In a machining process, the percentage of heat carried away by the chips is typically

Q2:

In strain gauge dynamometers the use of how many active gauge makes the dynamometers more effective

Q3:

Assertion (A): Tool wear is expressed in terms of flank wear rather than crater wear.

Reason (R): Measurement of flank wear is simple and more accurate.

Q4:

Crater wear on tools always starts at some distance from the tool tip because at that point

Q5:

Crater wear is predominant in

Q6:

 Taylor's tool life equation is VTⁿ = Constant. What is the value of n for ceramic tools?

Q7:

In a machining operation, doubling the cutting speed reduces the tool life to the $\frac{1}{8}$original value. The exponent n in Taylor's tool life equation

VTⁿ = C, is

Q8:

Using the Taylor equation VTⁿ =C, calculate the percentage increase in tool life when the cutting speed is reduced by 50% (Take n = 0∙5 and c = 400)

Q9:

For increasing the material removal rate in turning, without any constraints, what is the right sequence to adjust the cutting parameters?

1. Speed 2. Feed 3. Depth of cut

Select the correct answer using the code given below:

Q10:

A shaft has a dimension, $\varphi {35}^{{}_{-0.025}^{-0.009}}$

The respective values of fundamental deviation and tolerance are

Q11:

Two shafts A and B have their diameters specified as 100 ± 0.1 mm and 0.1 ± 0.0001 mm respectively. Which of the following statements is/are true?

Q12:

In an interchangeable assembly, shafts of size ${25.000}^{{}_{-0.0100}^{+0.040}}$mm mate with holes of size ${25.000}^{{}_{-0.000}^{+0.020}}$mm. The maximum possible clearance in the assembly will be

Q13:

The tolerance specified by the designer for the diameter of a shaft is 20.00 ± 0.025 mm. The shafts produced by three different machines A, B and C have mean diameters of 19∙99 mm, 20∙00 mm and 20.01 mm respectively, with same standard deviation. What will be the percentage rejection for the shafts produced by machines A, B and C?

Q14:

In order to have interference fit, it is essential that the lower limit of the shaft should be

Q15:

The fit on a hole‐shaft system is specified as H7‐s6.The type of fit is

Q16:

The vernier reading should not be taken at its face value before an actual check has been taken for

Q17:

In a simple micrometer with screw pitch 0.5 mm and divisions on thimble 50, the reading corresponding to 5 divisions on barrel and 12 divisions on thimble is

Q18:

Which one of the following instruments is a comparator?

Q19:

A sine bar is specified by

Q20:

The best wire size (in mm) for measuring effective diameter of a metric thread (included angle is 60^o) of 20 mm diameter and 2.5 mm pitch using two wire method is

Q21:

What is the dominant direction of the tool marks or scratches in a surface texture having a directional quality, called…

Q22:

Universal testing machine is used to test

Q23:

Green sand means

Q24:

In an orthogonal machining operation, the tool life obtained is 10 min at a cutting speed of 100 m/min, while at 75 m/min cutting speed, the tool life is 30 min. The value of index (n) in the Taylor’s tool life equation

Q25:

In a single‐point turning operation of steel with a cemented carbide tool, Taylor's tool life exponent is 0.25. If the cutting speed is halved, the tool life will increase by–