ISRO Question Papers with Answers 2020 | ISRO ME Paper Set-C
Question 11:
The ratio of maximum shear stress to average shear stress in a beam of rectangular section is
(a) 5.1
(b) 2/3
(c) 3/2
(d) 1.0
Ans: (c)
Question 12:
A massless beam has a loading pattern shown in figure. Find the bending moment at mid span?
(a) 1 kN-m
(b) 3 kN-m
(c) 2 kN-m
(d) 0.0 kN-m
Ans: (a)
Question 13:
Steel machine element at the critical section is in biaxial stress state with two principal stress being
300 N/mm2 and 300 N/mm2 (equal magnitude). Find the von Mises stress (in N/mm2) in the
member.
(a) 212.1
(b) 600
(c) 424.2
(d) 300
Ans: (d)
Question 14:
A machine component of 90 kg mass needs to be held in position using three springs as shown
below. The spring constants K1, K2 and K3 are 4, 4 and 8 N/m respectively. Find the natural
frequency of the system in rad/sec.
(a) 0.33
(b) 0.42
(c) 0.13
(d) 3.0
Ans: (a)
Question 15:
If, Kf is the fatigue stress concentration factor and Kt is the theoretical stress concentration factor
then, the notch sensitivity q is?
(a) (Kf + 1)/(Kt + 1)
(b) (Kf – 1)/(Kt – 1)
(c) (Kt – 1)/(Kf + 1)
(d) (Kf – 1)/(Kt + 1)
Ans: (b)
Question 16:
Beach or clamshell marks on a failed metallic surface are typical of
(a) Ductile fracture
(b) Brittle fracture
(c) Creep failure
(d) Fatigue failure
Ans: (d)
Question 17:
In vibration isolation if ω/ωn is less than 2 then the transmissibility will be
(a) Less than one
(b) Equal to one
(c) Greater than one
(d) Zero
Ans: (c)
Question 18:
The natural frequency of a simply supported beam of length l with mass M at its centre, flexural
rigidity EI and negligible beam mass is
Ans: (a)
Question 19:
A machine component of natural frequency 20 rad/s is subjected to a base motion from the
machine which is harmonic in nature with amplitude 3 m/s2 at 10 rad/s. What is the peak amplitude of relative displacement of the components if the damping is negligible?
(a) 0.1 mm
(b) 1.0 mm
(c) 10.0 mm
(d) 100.0 mm
Ans: (c)
Question 20:
In a shower mixer, cold water at 27 deg C, flowing at 5 kg/min is mixed with hot water at 77 deg C
flowing at 15 kg/min. The exit temperature of the mixture is
(a) 45.4 deg C
(b) 64.5 deg C
(c) 34.5 deg C
(d) 68.4 deg C
Ans: (b)
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