**DMRC Junior Engineer Mechanical Question Papers 2019 Sample Paper.**

**DMRC Junior Engineer Mechanical Question Papers 2019** Sample Paper Free pdf download pdf DMRC Junior Engineer Mechanical Delhi Metro Rail Corporation Paper DMRC Junior Engineer Mechanical Question Papers solved 2019 pdf Sample Question Papers of DMRC Junior Engineer Mechanical answers

In PERT analysis a critical activity has

A) maximum Float

B) zero Float

C) maximum Cost

D) minimum Cost

Answer : (B)

Environment friendly refrigerant R134a is used in the new generation domestic refrigerators. Its chemical formula is

A) CH C1 F2

B) C2 C13 F3

C) C2 C12 F4

D) C2 H2 F

4 Answer : (D)

The S-N curve for steel becomes asymptotic nearly at

A) 103 cycles

B) 104 cycles

C) 106 cycles

D) 109 cycles

Answer : (C)

In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The roll strip contact length will be

A) 5 mm

B) 39 mm

C) 78mm

D) 120mm

Answer : (A)

The angle between two unit-magnitude coplanar vectors P(0.866, 0.500,0) and Q(0.259, 0.966,0) will be

A) 0° B) -30°

C) 45°

D) 60°

Answer : (C)

15 A lot has 10% defective items. Ten items are chosen randomly from this lot. The probability that exactly 2 of the chosen items are defective is

A) 0.0036

B) 0.1937

C) 0.2234

D) 0.3874

Answer : (B)

the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 the type of tool motion will be

A) circular Interpolation — clockwise

B) circular Interpolation — counterclockwise

C) linear Interpolation

D) rapid feed

Answer : (A)

In an interchangeable assembly, shafts of size 25.000+0.040mm mate with holes of size 25.000+0.020 mm. The maximum possible clearance in the assembly will be

A) 10 microns

B) 20 microns

C) 30 microns

D) 60 microns

Answer : (D)

S-N curve for steel becomes asymptotic nearly at

A) 103 cycles

B) 104 cycles

C) 10 6 cycles

D) 10 9 cycles

Answer : (C)

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