Practice Test: Question Set - 38
1. Use of water as a manometric liquid suffers from the disadvantage of its
- (A) Low vapor pressure
- (B) Corrosive nature
- (C) High vapor pressure
- (D) High boiling point
2. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.
- (A) 70 & 30
- (B) 30 & 70
- (C) 50 & 50
- (D) 90 & 10
3. Iron content in Indian iron ore is about __________ percent.
- (A) 80-85
- (B) 60-65
- (C) 40-45
- (D) 20-25
4. Heat release during phase change is observed in case of a/an
- (A) Boiler
- (B) Condenser
- (C) Evaporator
- (D) All (a), (b) & (c)
5. Shrinkage allowance on pattern is provided to compensate for shrinkage when the
- (A) Metal changes from liquid state to solid state at freezing
temperature
- (B) Solid phase temperature drops from freezing temperature to the room
temperature
- (C) Liquid metal temperature drops from pouring temperature to room
temperature
- (D) Liquid metal temperature drops from pouring
temperature to freezing temperature
6. Carbon supply in pack carburizing process is in the form of
- (A) Charcoal
- (B) Calcium carbide
- (C) Hydrocarbon oil
- (D) Graphite
7. __________ of austenite decreases the hardenability in steel.
- (A) Fine grains
- (B) Coarse grains
- (C) Homogeneity
- (D) Dissolved elements (except cobalt)
8. Function of gear box is to
- (A) Reduce the speed
- (B) Obtain variable speed
- (C) Increase the speed
- (D) Produce high torque
9. Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be
- (A) More
- (B) Less
- (C) Same
- (D) Either more or less; depends on the climatic conditions
10. During sensible cooling of air, its wet bulb temperature
- (A) Decreases but dew point remains constant
- (B) Increases but dew point remains constant
- (C) Increases & the dew point decreases
- (D) Decreases & the dew point increases
11. Desalination of water
- (A) Makes it potable
- (B) Makes it non-potable
- (C) Means distillation of water
- (D) None of these
12. During sensible heating of humid air
- (A) Relative humidity increases
- (B) Dew point remains constant
- (C) Dry bulb & wet bulb temperature increases
- (D) Both 'b' & 'c'
13. __________ is a non volatile film forming constituent of a paint.
- (A) Thinner
- (B) Dryer
- (C) Drying oil
- (D) None of these
14. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
- (A) 1/k
- (B) k
- (C) k2
- (D) 1/k2
15. The mechanism involved in the removal of metal in drilling operation is by
- (A) Compression
- (B) Extrusion
- (C) Shearing
- (D) Both 'b' & 'c'
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