Practice Test: Question Set - 31
1. At 100% relative humidity, the dew point temperature of moist air is
- (A) Less than the wet bulb temperature
- (B) More than the wet bulb temperature
- (C) Equal to the wet bulb temperature
- (D) Equal to the ambient temperature
2. Dry saturated steam can be converted into superheated steam by
- (A) Increasing its cross-sectional area of flow
- (B) Passing it through a pressure reducing valve
- (C) Forcing it downwards through a vertical tube
- (D) None of these
3. __________ of hard alloy and tool steel is done to make it easily machinable.
- (A) Case carburizing
- (B) Tempering
- (C) Normalizing
- (D) Annealing
4. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?
- (A) Nitrogen oxides
- (B) Hydrocarbons
- (C) Both 'a' & 'b'
- (D) Carbon monoxide
5. In the Bayer's process, bauxite is digested under pressure using
- (A) H2SO4
- (B) NaOH
- (C) NH3
- (D) HCl
6. Dielectric
- (A) Is an electrical insulating material
- (B) Of low resistivity is preferred
- (C) Should have high thermal conductivity
- (D) Need not defy the corrosive action of chemicals
7. Closeness of packing is maximum in case of __________ crystal lattice.
- (A) Face centered
- (B) Simple cubic
- (C) Body centered
- (D) None of these
8. Enzymes belong to the category of
- (A) Proteins
- (B) Carbohydrates
- (C) Vitamins
- (D) Fats
9. For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot?
- (A) Temperature - entropy
- (B) Temperature - pressure
- (C) Enthalpy - entropy
- (D) Enthalpy-pressure
10. According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.
- (A) 0.5
- (B) 2
- (C) √2
- (D) √3/2
11. Brittleness induced due to the presence of sulphur in steel can be reduced by adding
- (A) Manganese
- (B) Magnesium
- (C) Vanadium
- (D) Copper
12. Rankine cycle comprises of two isothermal and two __________ processes.
- (A) Isobaric
- (B) Polytropic
- (C) Isentropic
- (D) None of these
13. The hardenability of steel decreases with
- (A) Decrease in dislocation density
- (B) Increase in solutionising temperature
- (C) Increase in strength
- (D) Decrease in grain size
14. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?
- (A) Enthalpy
- (B) Relative humidity
- (C) Wet bulb temperature
- (D) Dew point temperature
15. Diamagnetic materials
- (A) Are magnetized by eddy currents only
- (B) Are non-magnetic and cannot be magnetized
- (C) Are magnetized in direction opposite to the magnetic field
- (D) Can be magnetized in one direction only
Next Tests: