Practice Test: Question Set - 43
1. Increasing the carbon content of steel
- (A) Reduces the upper shelf energy
- (B) Increasing the ductility transition temperature
- (C) Decreases brittleness
- (D) Decreases hardness
2. Spark plug is provided in a/an
- (A) Engine having carburetor
- (B) Diesel engine
- (C) Compression ignition engine
- (D) Both (b) & (c)
3. Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
- (A) Sorbite
- (B) Bainite
- (C) Martensite
- (D) Troostite
4. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
- (A) 370
- (B) 340
- (C) 320
- (D) 300
5. What is the percentage of chromium in 18-4-1 high speed steel?
- (A) 1
- (B) 4
- (C) 18
- (D) 23
6. With decrease in the grain size of a material, its creep resistance
- (A) Increases
- (B) Decreases
- (C) Remain constant
- (D) Either (a) or (b); depends on the material
7. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
- (A) 250
- (B) 500
- (C) 1000
- (D) 3000
8. An oxidation process is accompanied with decrease in the
- (A) Number of electrons
- (B) Oxidation number
- (C) Number of ions
- (D) All (a), (b) & (c)
9. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.
- (A) 20
- (B) 60
- (C) 120
- (D) ∞
10. Consumable electrodes are used in the __________ welding.
- (A) Gas
- (B) Arc
- (C) Thermit
- (D) Resistance
11. Dislocation cross-slip is difficult in those materials, which have
- (A) Large number of slip systems
- (B) High work hardening rate
- (C) Coarse grain size
- (D) Low stacking fault energy
12. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
- (A) Is as light as possible
- (B) Has very high C.O.P.
- (C) Employs minimum quantity of refrigerant
- (D) Consumer minimum horse power
13. Cold chisel & hammers are made of
- (A) High speed steel
- (B) High carbon steel
- (C) Forged steel
- (D) Mild steel
14. Dew point temperature always gives an indication of the __________ of the moist air.
- (A) Dryness
- (B) Moisture content
- (C) Coolness
- (D) Latent heat
15. Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?
- (A) E = 2G (1 + v)
- (B) E = G (1 + v)
- (C) E = G (1 + v)/2
- (D) E = 2G (1 + 2v)
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