Practice Test: Question Set - 48
1. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
- (A) Parallel flow with equal heat capacities
- (B) Counter flow with equal heat capacities
- (C) Counter flow with unequal heat capacities
- (D) Parallel flow with unequal heat capacities
2. The behavior of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the
- (A) Work hardening
- (B) Bauschinger effect
- (C) Creeping effect
- (D) Stress recovery effect
3. 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.
- (A) 15
- (B) 25
- (C) 10
- (D) 30
4. Yield strength of a polycrystalline metal with an average grain size ‘d’, is proportional to
- (A) d1/2
- (B) d-1/2
- (C) d
- (D) d-1
5. Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
- (A) Steel
- (B) Lignite
- (C) Water
- (D) Lime stone
6. The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.
- (A) Runner
- (B) Cylinder
- (C) Mold
- (D) None of these
7. On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is
- (A) Creep
- (B) Toughness
- (C) Tensile strength
- (D) Fatigue
8. Identify the false statement
- (A) Martensitic steels are less susceptible to pitting corrosion than
austenitic steels
- (B) Pitting corrosion is usually very localized
- (C) Hydrogen embrittlement is facilitated by tensile stress
- (D) Stress corrosion cracking is facilitated by tensile stress
9. '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)
- (A) V
- (B) V/2
- (C) 2V
- (D) 3V
10. The condition of diffraction from a crystal is given by
- (A) nλ = 2d Sin θ
- (B) λ = d Sin 2θ
- (C) λ = 2d Sin 2θ
- (D) nλ = d Sin θ
11. Pick out the wrong statement.
- (A) The equivalent stiffness of two springs (of equal stiffness 'S') in
series is S/2 while in parallel is 2S
- (B) For a helical spring, deflection is proportional to D3 (D
= mean coil diameter) or d4 (d = wire diameter)
- (C) Crushing load or columns is less than the buckling load
- (D) Modulus of resilience is proportional to (stress at elastic limit)2
12. The life of a ball bearing is inversely proportional to
- (A) (Load)1
- (B) (Load)2
- (C) (Load)3
- (D) (Load)0.33
13. Air intake for an air compressor should be preferably taken from
- (A) A site, where cooling towers are located nearby
- (B) A site, where open coal yard in located nearby
- (C) An air conditioned room maintained at a temperature of 18°C
- (D) An outside atmosphere at 10°C
14. Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.
- (A) Concentration
- (B) Velocity
- (C) Temperature
- (D) None of these
15. Ammonia gas can be dried by
- (A) PCl5
- (B) Quick lime
- (C) CaCl2
- (D) Concentrated H2SO4
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