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# BARC 2021 ME: Full Syllabus Test 12

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Question 1

Consider two hydraulic turbines having identical specific speed and effective head at the inlet. If the speed ratio (N1/N2) of the two turbines is 2, then the respective power ratio (P1/P2) is ________

Question 2

During a rolling process, a sheet of  thick is rolled down to  thickness. If the roll of diameter rotates at , calculate the velocity of strip  at the neutral point.

Question 3

A steam plant has the boiler efficiency of 82%, turbine efficiency (mechanical) of 84%, generator efficiency of 85%. If 6% of the generated power is used to run the auxiliaries, the overall plant efficiency is ___________.

Question 4

A body weighing 1000 kg falls 8 cm and strikes a 500 kg/cm spring. The deformation of spring will be ____cm.

Question 5

The life of a ball bearing at a load of 10 kN is 8000 hours. Its life in hours, if the load is increased to 20 kN, keeping all other conditions the same, is

Question 6

If young’s modulus of elasticity of a material is 140 GPa and Bulk modulus is 70 GPa, what will be the Poisson’s ratio (μ)?

Question 7

Consider the following statements regarding fins:

(A). A fin is more effective if Biot number is less than one.

(B). A fin is less effective if Biot number is less than one.

(C). Fin will act as an insulation for a surface if h > mk.

(D). fin will enhance heat transfer if h > mk.

Which of the following statements are correct _________?

Question 8

For the cantilever beam shown below, calculate the maximum shear stress developed:

Question 9

Which of the following is incorrect with respect to increase in condenser pressure?

Question 10

A single point cutting tool with 0°rake angle is used in an orthogonal machining process. At a cutting speed of 180 m/min. the thrust force is 490 N. If the coefficient of friction between the tool and the chip is 0.7, then the power consumption (in kW) for the machining operation is _______

Question 11

Consider the following statements:
Helical gears may be designed in applications where gears are to be mounted on
1) Non-parallel shafts.
2) Parallel shafts.
3) Intersecting shafts.
4) Non-parallel and non-intersecting shafts.
Which of these statements is/are correct?

Question 12

Which of the statements given below is/are correct ?
(1) Pressure angle is defined as the angle between the direction of follower movement & the normal to the base curve at any point.
(2) In case of radial translating roller follower, parabolic motion of the follower is very appropriate for high speed cams.

Question 13

For long column of length L, what will be the ratio of

where,

P1 = Euler’s buckling load, when both ends are hinged.

P2 = Euler’s buckling load, when both ends are fixed.

Question 14

Select the best options from below, which correctly matches the ‘Operating mode of SI engine’ (List A) with the ‘Desired A/F ratio’ (List B):

Question 15

Calculate the bearing life , if rating life for  bearings is 9000h and shaft is rotating at 1500rpm.
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