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Consider the following statements and choose the correct answer:<br>1. A direct proportionality exists between vapour pressure and the concentration of water vapour in the atmosphere<br>2. Relative humidity is an expression of the ratio of the actual vapour pressure of the atmosphere when saturated at the same temperature<br>3. A rise or fall in temperature with no change in vapour pressure will cause a drop or rise, respectively, in relative humidity<br>4. A rise or fall in vapour pressure with no change in temperature will be accompanied by a rise or fall, respectively, in relative humidity
A
1, 2, 3 and 4 are true
B
Only 3 and 4 are true
C
Only 2 and 4 are true
D
Only 1, 2 and 3 are true
Correct Answer:
1, 2, 3 and 4 are true
A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise -fall periods and rise and fall periods should be same. The maximum rise in follower is 30 mm. How much the follower will rise when the follower is 120 degrees from its initial position of a cam?
A
30
B
20
C
15
D
10
A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise-fall periods and rise and fall periods should be same. The maximum rise in follower is 45 mm. How much the follower will rise when the follower is 45 degrees from its initial position of a cam?
A
22.5
B
0
C
30
D
15
A cam should be designed only using uniform rise and fall within the second half of cam profile, the first half is dwell period, without any dwell period in between the rise and fall periods and rise and fall periods should be same. The maximum rise in follower is 45 mm. How much the follower will rise when the follower is 120 degrees from its initial position of a cam?
A
15
B
30
C
20
D
0
A cam should be designed only using uniform rise and fall within the second half of cam profile, the first half is dwell period, without any dwell period in between the rise and fall periods and rise and fall periods should be same. The maximum rise in follower is 55 mm. How much the follower will rise when the follower is 240 degrees from its initial position of a cam?
A
18.3
B
0
C
27.5
D
36.6
A cam should be designed only using uniform rise and fall within first half of cam profile, the remaining is dwell period, and without any dwell period in between the rise-fall periods and rise and fall periods should be same. The maximum rise in follower is 35 mm. How much the follower will rise when the follower is 240 degrees from its initial position of a cam?
A
17.5
B
11.6
C
0
D
23.3
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
A
Humidity ratio
B
Relative humidity
C
Absolute humidity
D
Degree of saturation
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A
Humidity ratio
B
Relative humidity
C
Absolute humidity
D
Degree of saturation
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is
A
0.048
B
0.079
C
0.122
D
0.152
Relative humidity is given by (where p
v
= Partial pressure of water vapour, p
b
= Barometric pressure, p
s
= Pressure of saturated air, p
d
= Pressure at dry bulb temperature, p
w
= Saturation pressure corresponding to wet bulb temperature and $$\mu $$ = Degree of saturation)
A
$$\frac{{0.622{{\text{p}}_{\text{v}}}}}{{{{\text{p}}_{\text{b}}} - {{\text{p}}_{\text{V}}}}}$$
B
$$\frac{\mu }{{1 - \left( {1 - \mu } \right)\frac{{{{\text{p}}_{\text{s}}}}}{{{{\text{p}}_{\text{b}}}}}}}$$
C
$$\frac{{{{\text{p}}_{\text{v}}}\left( {{{\text{p}}_{\text{b}}} - {{\text{p}}_{\text{d}}}} \right)}}{{{{\text{p}}_{\text{d}}}\left( {{{\text{p}}_{\text{b}}} - {{\text{p}}_{\text{v}}}} \right)}}$$
D
None of these
A compound dissolves in water at a rate proportional to the product of the amount of undissolved solid and the difference between the concentration in a saturated solution and the actual solution; i.e., Csat – C(t). A saturated solution of this compound contains 40 g per 100 g of water. In a test run starting with 20 kg of undissolved compound in 100 kg of water, it was found that 5 kg dissolved in 3 hr. if the test continues, how many kg of compound will remain undissolved after 7 hr? Assume that the system is isothermal.
A
11.56 kg
B
10.72 kg
C
11.76 kg
D
10.52 kg