Inside an aeroplane flying at a high altitude, (a) the pressure is the same as that outside (b) normal atmospheric pressure is maintained by the use of air pumps (c) the pressure inside is less than the pressure outside (d) normal humidity and partial vacuum are maintained

1 Answer

Answer :

Ans:(b)

Related questions

Description : Of the four locations mentioned below, the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open (a) At sea level (b) At the top of Mt Everest (c) ... ) In an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

Last Answer : Ans:(c)

Description : The ink of a pen leaks out in an airplane because (a) Atmospheric pressure increases (b) Pressure of ink inside is more than the ambient pressure (c) High speed of the aeroplane (d) Temperature difference

Last Answer : Ans:(b)

Description : Shortly after take-off, the altitude of the aeroplane suffers an abrupt pitch-up and IAS rapidly decreases followed quickly by a decrease in altitude. Engine indications are normal. You should suspect what ... to gain airspeed d. Local clear air turbulence; reduce speed to VRA and ride it out

Last Answer : b. Loss of head wind or an increase in tail wind; apply full power

Description : When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the (A) Partial pressure of water vapour is less than the total pressure (B) Humidity is < 100% & dew ... Dew point temperature of air has not reached & air is not saturated fully (D) Air is fully saturated

Last Answer : (D) Air is fully saturated

Description : _________is the partial pressure of water vapor at the existing temperature divided by the equilibrium vapor pressure of water at the existing temperature.  a. vacuum pressure  b. relative humidity  c. absolute pressure  d. vapor pressure

Last Answer : relative humidity

Description : Dry-bulb temperature is: a. The absolute temperature corresponding to the atmospheric pressure b. The same as the wet-bulb temperature if the relative humidity is less than 100% c. Not required ... d. The temperature of the air measured with an ordinary thermometer e. The dew point temperature

Last Answer : Answer: D

Description : Why do brids not have respiratory trouble at the time of flying at high altitude ? (1) Their lungs are very large (2) They fly inactively (3) They have extra air sacs (4) They use less oxygen

Last Answer : They have extra air sacs

Description : A supercharger is used in the engines of earthmoving machines at higher altitudes because (a) The ambient atmospheric pressure is less at higher altitudes (b) Four-cycle engines depend on the suction ... rugged enough for higher altitude (d) The ambient temperature is less as the altitude is higher

Last Answer : (a) The ambient atmospheric pressure is less at higher altitudes

Description : Which of the following situations can be approximated to a steady state heat transfer system? (A) A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at ... flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C

Last Answer : (B) 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C

Description : In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes (A) Less than atmospheric pressure (B) More than liquid vapor pressure (C) Less than liquid vapor pressure (D) More than atmospheric pressure

Last Answer : (C) Less than liquid vapor pressure

Description : The stalling speed of an aeroplane is most affected by: a. Changes in air density b. Variations in aeroplane loading c. Variations in flight altitude d. Changes in pitch attitude

Last Answer : b. Variations in aeroplane loading

Description : People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude ... required amount of O2 to survive (d) there is more UV radiation which enhances RBC production.

Last Answer : (c) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive

Description : Pick out the wrong statement (A) A horizontal line on the humidity chart indicates the temperature changes at constant molal humidity (B) When water is cooled from 80 to 70°C by exposure ... & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

Last Answer : (D) Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

Description : The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the (A) Solution has ... B) Evaporators operate under vacuum (C) Evaporators operate at atmospheric pressure (D) None of these

Last Answer : (A) Solution has an elevation of boiling point

Description : How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and ... given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Last Answer : Natural pressure head density between cold outside air and humid inside air

Description : How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and ... given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Last Answer : Natural pressure head density between cold outside air and humid inside air

Description : A hydrogen filled balloon rises in air because (a) The atmospheric pressure decreases with altitude (b) The acceleration due to gravity decreases with altitude (c) The density of air decreases with ... The buoyant force exerted by the air on the balloon is greater than the weight of the balloon

Last Answer : Ans:(d)

Description : During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains ... pressure of water vapor (C) Relative humidity (D) None of these

Last Answer : (A) Wet bulb temperature

Description : When an unsaturated air-water mixture is heated at constant pressure, then (A) The partial pressure of water vapour increases (B) The specific humidity decreases (C) The relative humidity increases (D) The relative humidity decreases

Last Answer : D) The relative humidity decreases

Description : Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known? (A) Dew point (B) Humidity ratio (C) Wet bulb temperature (D) None of these

Last Answer : (C) Wet bulb temperature

Description : On a day when the partial pressure of water vapor remains constant, what happens as the temperature rises?  a. the relative humidity increases  b. the relative humidity decreases  c. the relative humidity remains constant  d. the air would eventually become saturated

Last Answer : the relative humidity decreases

Description : Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled (A) And ... (C) At the same relative humidity (D) And dehumidified with decrease in wet bulb temperature

Last Answer : (D) And dehumidified with decrease in wet bulb temperature

Description : The ratio of partial pressure of water vapour in a mixture to the saturation pressure of water at the same temperature of the mixture is called as A. humidity B. partial humidity C. specific humidity D. relative humidity

Last Answer : ANSWER : D

Description : Which of the following statement(s) concerning laboratory studies used in monitoring a patient with intravenous heparinization is/are correct? a. The platelet count should be followed because of the ... serum creatinine should be measured daily to allow adjustments in dose based on renal function

Last Answer : Answer: a, c In monitoring the effect of heparin, an activated partial thromboplastin time (aPTT) of 1.5 control or a thrombin clotting time (TCT) of 2 times control reflects adequate ... system. Therefore the dose of heparin need not be adjusted in cases of liver or renal dysfunction

Description : In the event of cabin depressurization, the actions of the pilot will be to: a. Immediately commence a diversion to a suitable alternate b. Increase engine power to provide additional ... a descent to an altitude where the supplemental oxygen supply is sufficient for all crew and passengers

Last Answer : d. Commence a descent to an altitude where the supplemental oxygen supply is sufficient for all crew and passengers

Description : An aircraft is flying at constant indicated altitude over a warm airmass. The altimeter reading will be: a. Correct b. Greater than the real altitude c. Less than the real altitude d. Oscillating around the correct altitude

Last Answer : c. Less than the real altitude

Description : An aircraft is flying at constant indicated altitude over a warm airmass. The altimeter reading will be: a. Correct b. Greater than the real altitude c. Less than the real altitude d. Oscillating around the correct altitude

Last Answer : c. Less than the real altitude

Description : Maximum Differential pressure: a. Is the maximum authorized pressure difference between the inside of the fuselage and the atmospheric ambient pressure b. Is the absolute pressure provided by the vacuum ... time limit d. Is the absolute pressure the cabin pressure ducting is designed to carry

Last Answer : a. Is the maximum authorized pressure difference between the inside of the fuselage and the atmospheric ambient pressure

Description : Maximum Differential pressure: a. Is the maximum authorized pressure difference between the inside of the fuselage and the atmospheric ambient pressure b. Is the absolute pressure provided by the ... time limit d. Is the absolute pressure the cabin pressure ducting is designed to carry

Last Answer : a. Is the maximum authorized pressure difference between the inside of the fuselage and the atmospheric ambient pressure

Description : What is the height of a vacuum of Toricelli if it is examined with a 1m long canopy at normal atmospheric pressure ?

Last Answer : Answer : At normal atmospheric pressure , if Toricelli is examined with a 1m long canopy, the vacuum height of Toricelli will be 24 cm .

Description : The difference between the absolute pressure and the atmospheric pressure is called the _____ pressure.  A. Gage  B. Normal  C. Standard  D. Vacuum

Last Answer : Gage

Description : A bird weighing 2 pounds is inside a completely enclosed box weighing 3 pounds. There is no air exchange between the inside and outside of the box. If the box is placed on a scale, and the bird is flying inside the box, what weight does the scale read? 

Last Answer : ANSWER: 5 POUNDS

Description : Which of the following produces maximum pressure difference for transportation of gases? (A) Vacuum pumps (B) Blowers (C) Fans (D) Compressors

Last Answer : (D) Compressors

Description : Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg. (A) 1 (B) 0.1 (C) 0.01 (D) 0.001

Last Answer : (C) 0.01

Description : Partial pressure of carbon dioxide in Alveoli , atmospheric air and tissures will be `:-`

Last Answer : Partial pressure of carbon dioxide in Alveoli , atmospheric air and tissures will be `:-` A. 0.3,40,45 B. 40,0.3,45 C. 0.3,104,28 D. 104,159,40

Description : 01. When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure. A) Agree B) Disagree

Last Answer : Option A

Description : The pressure less than atmospheric pressure is known as (A) Suction pressure (B) Vacuum pressure (C) Negative gauge pressure (D) All of these

Last Answer : Answer: Option D

Description : At the alternate aerodrome, the commander of a turbojet engine aeroplane should have a fuel quantity (final reserve) sufficient for flying during: a. 30 minutes at holding flight speed at 1,500 ft b. 45 ... speed at 1,500 ft c. 30 minutes at cruising speed d. 45 minutes at cruising speed

Last Answer : a. 30 minutes at holding flight speed at 1,500 ft

Description : Vacuum is generally maintained in the vapour space of an evaporator mainly to (A) Get economical temperature difference by using moderate pressure steam (B) Facilitate forward ... (C) Concentrate heat sensitive materials (D) Achieve very high concentration of the final product

Last Answer : (A) Get economical temperature difference by using moderate pressure steam

Description : Compressed air coming out from a punctured football  (a) becomes hotter  (b) becomes cooler1  (c) remains at the same temperature  (d) may become hotter or cooler depend-ing upon the humidity of the surround¬ing air  (e) attains atmospheric temperature.

Last Answer : (b) becomes cooler1

Description : Producer gas containing least amount of tar is produced by the (A) Partial combustion of coal (B) Partial combustion of large size (< 50 mm) coke (C) High pressure gasification of coal (e.g. in Lurgi gasifier) (D) Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)

Last Answer : (B) Partial combustion of large size (< 50 mm) coke

Description : Which of the following remains constant during sensible cooling process? (A) Specific humidity (B) Partial pressure of vapour (C) Both (A) and (B)

Last Answer : (C) Both (A) and (B)

Description : Which of the following remains constant during evaporative cooling process with recirculated water supply? (A) Relative humidity (B) Partial pressure of vapour (C) Wet bulb temperature (D) None of these

Last Answer : (C) Wet bulb temperature

Description : At a fixed total pressure, humidity depends only on the (A) Partial pressure of vapour in the mixture (B) Heat capacity of the vapour (C) Density of the vapour (D) None of these

Last Answer : (A) Partial pressure of vapour in the mixture

Description : Relative humidity is the ratio of the (A) Partial pressure of the vapour to the vapour pressure of the liquid at room temperature (B) Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature (C) Actual humidity to saturation humidity (D) None of these

Last Answer : (B) Partial pressure of the vapour to the vapour pressure of the liquid at gas temperatur

Description : Which of the following decreases during evaporative cooling process with recirculated water supply? (A) Wet bulb temperature (B) Relative humidity (C) Partial pressure of vapour (D) None of these

Last Answer : (D) None of these

Description : At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent. (A) 100 (B) 0 (C) 50 (D) Between 0 and 100

Last Answer : (B) 0

Description : Which of the following increases during evaporative cooling process with recirculated water supply? (A) Wet bulb temperature (B) Relative humidity (C) Partial pressure of vapour (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Description : gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its (A) Aqueous tension (B) Saturated humidity (C) Vapor pressure

Last Answer : Option A

Description : Aerospace engineers, how long would a commercial passenger aeroplane last in the vacuum of space, before it starts leaking atmosphere?

Last Answer : answer:I'm not a structural guy . Maybe someone can answer that part of your question. I can however answer about over design. We make an engine critical part that is exposed to an operating ... for that altitude craft could survive in outer space since that would be only about 33% more stress.