Practice Test: Question Set - 49
1. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
- (A) A
- (B) D
- (C) 1/A
- (D) 1/A2
2. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
- (A) Ambient
- (B) Dry bulb
- (C) Dew point
- (D) Wet bulb
3. In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
- (A) 1
- (B) 1.4
- (C) 1.5
- (D) Y = Cp/Cv
4. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
- (A) 23
- (B) 23/2
- (C) 25/2
- (D) 21/3
5. Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is
- (A) R ln 2
- (B) -R ln 2
- (C) 3 R ln 2
- (D) -3R ln 2
6. Brazing filler metal used for joining steel plates
- (A) Melts below the melting points of base metals
- (B) Melts below 300°C
- (C) Is copper phosphorous alloy
- (D) Is copper
7. For grinding of softer materials, the grinding wheel should have __________ grain size.
- (A) Finer
- (B) Coarser
- (C) Medium
- (D) Any type of
8. The activity of pure hydrogen gas at 1000°C and 5 atm pressure
- (A) Is always less than 1
- (B) Is always greater than 1
- (C) Can be 5
- (D) Depends on the choice of the standard state
9. A furnace is made of a refractory brick wall of thickness 0.5 meter and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ meter.
- (A) 0.01
- (B) 0.1
- (C) 0.25
- (D) 0.5
10. Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8
- (A) °C
- (B) °F
- (C) °K
- (D) °R
11. Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
- (A) 300
- (B) 800
- (C) 1400
- (D) 2000
12. __________ metal is used as a bearing liner material.
- (A) Pewter
- (B) White
- (C) Babbitt
- (D) Gun
13. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)
- (A) x1.5
- (B) x0.8
- (C) x-1.5
- (D) x-0.8
14. Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.
- (A) 80-120
- (B) 200-300
- (C) 600-800
- (D) 1000-1100
15. Exposure to __________ accelerates the degradation of plastics.
- (A) Ultraviolet radiation
- (B) High atmospheric temperature
- (C) High ambient temperature
- (D) Damp atmosphere
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