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NHPC JE’21 ME: Daily Practices Quiz. 25-Sep-2021

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NHPC-JE’21 ME: Daily Practices Quiz

NHPC-JE’21 ME: Daily Practices Quiz 25-Sep-2021

Quiz: Mechanical Engineering
Exam: NHPC JE
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes

Q1. The resistance to fatigue of a material is measured by
(a) elastic limit
(b) Young’s modulus
(c) ultimate tensile strength
(d) endurance limit

Q2. The failure of a material under varying load, after a number of cycles of such load, is known as
(a) Ductile failure
(b) Brittle failure
(c) Impact failure
(d) Fatigue failure

Q3. The throttling operation in a refrigeration cycle is carried out in
(a) Evaporator
(b) Condenser
(c) Expansion valve
(d) Capillary tube

Q4. The leakage in a refrigeration system using ammonia is detected by
(a) Halide torch
(b) Sulphur sticks
(c) Soap solution
(d) Hot water

Q5. The moment of inertia of a hollow circular section whose external diameter is 13 cm and internal diameter is 12 cm about centroidal axis is _______
(a) 437.5
(b) 137.5
(c) 284.5
(d) 384.1

Q6. Which cross-section of a cantilever beam which is loaded with UDL can give economical design–
(a) Square
(b) Circular
(c) I-Section
(d) Rectangular

Solutions

S1. Ans. (d)
Sol. Endurance limit

S2. Ans. (d)
Sol. The failure of a material under varying load, after a number, of cycles of such load is known as fatigue failure.

S3. (d)
Sol. The throttling operation in a refrigeration cycle is carried out in capillary tube.

S4. Ans. (b)
Sol. The leakage in a refrigeration system using ammonia is detected by Sulphur sticks

S5. Ans. (d)
Sol. moment of inertia of follow circular section
I=π/64 ( d_O^4-di_O^4 )
=π/64 (13^4-12^4 )
=384.1 cm^4
S6. Ans. (c)
Sol. I-section of a cantilever beam which is loaded with UDL will give must economical design as for strongest cross section, moment of resistance (M_R) should be maximum, which depend upon section modules (2). For same cross-sectional area, section modules of I-section is maximum, hence it will be most economical design.

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Published by VINAYAK KUMAR

Graduated from BIT Sindri, Postgraduated from IIT BHU Varanasi

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