DMRC JE Exam Model Paper

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DMRC JE Model paper
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)