Questions and answers for exam Preparation

MCQs

Total Questions : 5013 | Page 501 of 502 pages

Question 5001. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is ________________ mm?

Discuss Question

Answer: Option B. -> 25
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5002. Out of the following substances, one ton of ______________ will store the maximum heat for a rise of 30°C in temperature ?

Steel
Lignite
Water
Lime stone

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Answer: Option C. -> Water
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5003. ‘Dikes’ are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel) ?

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Answer: Option A. -> V
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5004. On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________?

Creep
Toughness
Tensile strength
Fatigue

Discuss Question

Answer: Option B. -> Toughness
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5005. Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?

Lower cost
Abundant availability
Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
None of these

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Answer: Option C. -> Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5006. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type________________?

Parallel flow with equal heat capacities
Counter flow with equal heat capacities
Counter flow with unequal heat capacities
Parallel flow with unequal heat capacities

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Answer: Option B. -> Counter flow with equal heat capacities
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5007. Steel produced from phosphatic iron is _______________ in nature?

Malleable
Ductile
Brittle
Tough

Discuss Question

Answer: Option C. -> Brittle
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5008. Pick out the wrong statement?

Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in th
Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections
Brittle materials are generally tested in tension

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Answer: Option B. -> Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5009. Pick out the wrong statement ?

The equivalent stiffness of two springs (of equal stiffness ‘S’) in series is S/2 while in parallel is 2S
For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire diameter)
Crushing load or columns is less than the buckling load
Modulus of resilience is proportional to (stress at elastic limit)2

Discuss Question

Answer: Option C. -> Crushing load or columns is less than the buckling load
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5010. Pick out the wrong statement ?