1) A flight is carrying 130 passengers over a distance of 990km with a seating capacity of 140 and a yield of 7.9. Calculate the available seats kilometer.
a. 148700
b. 138600
c. 128700 d. 154800
|
Answer
Explanation
|
ANSWER: 138600
Explanation:
The answer is 138600. Given number of passengers travelling = 130, seating capacity=140 and a yield of 7.9. We know that available seats kilometer=number of seats available*distance travelled.
On substituting the values
Available seats kilometer=130*990
Available seats kilometer=128700.
|
|
2) What is the ideal gas equation?
a. P=nRT
b. PV=nRT
c. PV=ρRT d. Pρ=RT
|
Answer
Explanation
|
ANSWER: PV=nRT
Explanation:
The ideal gas equation is PV=ρRT, where
P=pressure of gas (Units=N/m2)
V=volume of gas (Units=m3)
ρ=density of gas (Units=Kg/m3)
R=universal gas constant (Units=Nm/kg-K)
T=temperature of gas (Units=K).
|
|
3) Between the poles and the equator the mean global temperature roughly follows a sine curve.
a. True
b. False
c. _ d. _
|
Answer
Explanation
|
ANSWER: True
Explanation:
Between the poles and the equator the mean global temperature roughly follows a sine curve. This is due to the changes of temperature near the equator and the poles. At the equator the mean seasonal variation is small and the mean temperature is high whereas at the poles the mean seasonal variation is large and the mean temperature is low.
|
|
4) Which of the following is the major reason for the global atmosphere pressure distribution?
a. Convective air flow
b. Conductive air flow
c. Radiation air flow d. Conductive and radiation air flow
|
Answer
Explanation
|
ANSWER: Convective air flow
Explanation:
The convective air flow is the major reason for the global atmosphere pressure distribution. The Coriolis forces cause the air flow to swirl and create a series of convectional current cells which results in the general pattern of high and low pressure region over the surface of the earth.
|
|
5) What is meant by Coriolis force?
a. An earth force that tends to deflect the moving objects on earth
b. An earth force that tends to vary the temperature
c. An earth force that tends to vary the pressure d. An earth force that tends to vary the gravitational force
|
Answer
Explanation
|
ANSWER: An earth force that tends to deflect the moving objects on earth
Explanation:
Coriolis force is an earth force that acts perpendicular to the direction of motion and to the axis of rotation. This force tends to deflect moving objects to the left in the southern hemisphere and towards the right in the northern hemisphere.
|
|
6) Which of the following holds a correct relation between pressure, temperature and altitude?
a. Pressure increases, temperature decreases, altitude increases
b. Pressure decreases, temperature decreases, altitude increases
c. Pressure decreases, temperature increases, altitude increases d. Pressure decreases, temperature decreases, altitude decreases
|
Answer
Explanation
|
ANSWER: Pressure decreases, temperature decreases, altitude increases
Explanation:
As the pressure decreases there will be a temperature decreases during an increase in altitude. This is based on ideal gas equation PV=nRT where,
P=pressure of gas (Units=N/m2)
V=volume of gas (Units=m3)
ρ=density of gas (Units=Kg/m3)
R=universal gas constant (Units=Nm/kg-K)
T=temperature of gas (Units=K).
|
|
7) What are the percentages of nitrogen, oxygen, argon and carbon dioxide in atmosphere?
a. 78%, 21%, 0.9%, 0.03%
b. 75%, 24%, 0.7%, 0.03%
c. 71%, 28%, 0.9%, 0.04% d. 75%, 24%, 0.9%, 0.05%
|
Answer
Explanation
|
ANSWER: 78%, 21%, 0.9%, 0.03%
Explanation:
The percentages of nitrogen, oxygen, argon and carbon dioxide in atmosphere are 78%, 21%, 0.9%, 0.03%. The atmosphere also consists of other inert gases, dust particles, water vapor and moisture in minute quantities.
|
|
8) What is the value of characteristic gas constant(R) in Nm/kg-K?
a. 287.05287
b. 2.8705287
c. 2870.5287 d. 2.8705287
|
Answer
Explanation
|
ANSWER: 287.05287
Explanation:
The value of characteristic gas constant(R) is 287.05287 Nm/kg-K and the value of universal gas constant (R0) is 8.3145 J/mol. The relation between them is R=R0M , where R0 is universal gas constant; R is characteristic gas constant and M is molecular weight of the substance.
|
|
9) The ratio of specific heats (γ) of air is _________
a. 1.6
b. 1.7
c. 1.4 d. 1.8
|
Answer
Explanation
|
ANSWER: 1.4
Explanation:
The ratio of specific heats (γ) of air is 1.4. Ratio of specific heats is the ratio of specific heat of air at constant pressure to the specific heat of air at constant volume, i.e. CpCv=γ. Cp of air is 1.008 kJ/kg-K; Cv of air is 0.721 kJ/kg-K at standard levels. So γ=1.0080.721=1.4.
|
|
10) At the equator the mean seasonal variation is small and the mean temperature is high whereas at the poles the mean seasonal variation is large and the mean temperature is low.
a. True
b. False
c. _ d. _
|
Answer
Explanation
|
ANSWER: True
Explanation:
At the equator the mean seasonal variation is small and the mean temperature is high whereas at the poles the mean seasonal variation is large and the mean temperature is low. This is due to the change in temperature with respect to the altitude of the atmosphere. It is almost similar to a sine graph.
|
|
11) Regions of low pressure, cyclones and high pressure, anti-cyclones are formed by effects of convection currents in the atmosphere.
a. True
b. False
c. _ d. _
|
Answer
Explanation
|
ANSWER: True
Explanation:
Regions of low pressure, cyclones and high pressure, anti-cyclones are formed by effects of convection currents in the atmosphere. This is caused due to the air transporting from higher temperature regions to the lower temperature regions.
|
|
12) According to ISA atmospheric model what is the value of datum atmospheric pressure in N/m2?
a. 101325
b. 101335
c. 101336 d. 101326
|
Answer
Explanation
|
ANSWER: 101325
Explanation:
According to ISA atmospheric model what is the value of datum atmospheric pressure is 101325 N/m2. It can also be written in 1atm or 1.01325 bar or 101325 Pascal. The conversion of N/m2 to bar is 1 bar=105 N/m2. The conversion of bar to Pascal is 1 bar=1 Pascal.
|
|
