1. 1 foot=_________meters
a) 3.28084
b) 0.3678
c) 0.3048
d) 3.4567
Explanation: 1 foot=0.3048 meters. Foot is unit of length or distance in general system whereas meter is a standard unit. Meter is the S.I unit of length in MKS system and used by everyone throughout the world.
2. Which of the following are measured by Pitot – static system in air data system?
a) Height, mach number, airspeed
b) Pressure, density, temperature
c) Height, mach number, pressure
d) Height, mach number, density
Explanation: Height, mach number, airspeed are the quantities measured by Pitot – static system in air data system. They convert the air fed pressures into the movement of a pointer in mechanical instrument.
3. Pitot-static system is a primary flight instrument.
a) True
b) False
Explanation: Pitot-static system is not a primary measuring instrument. The altimeter, indicator and mach meter are the primary flight instruments. The secondary flight instruments are air temperature sensor and ADD’s.
4. ADD is a secondary flight instrument.
a) True
b) False
Explanation: The secondary flight instruments are air temperature sensor and ADD’s. The altimeter, indicator and mach meter are the primary flight instruments. The primary instruments are mechanical instruments whereas the secondary instruments are electrical power based instruments.
5. What is meant by altimeter reading?
a) It is the reading of individual mechanical instrument which calculates the pressure
b) It is the reading of individual electrical instrument which calculates the pressure
c) It is the reading of individual mechanical instrument which calculates the density
d) It is the reading of individual electrical instrument which calculates the density
Explanation: Altimeter reading is the reading of individual mechanical instrument which calculates the pressure. During these calculations some corrections are made to avoid errors that are caused due to mechanical tolerance.
6. What is meant by indicated altitude?
a) It is the pitot-static reading corrected for performance error
b) It is the altimeter reading corrected for instrument error
c) It is the pitot-static reading corrected for instrument error
d) It is the altimeter reading corrected for performance error
Explanation: Indicated altitude is the altimeter reading corrected for instrument error. The indicated altitude will be measured with reference to the appropriate altimeter datum pressure setting.
7. Altimeter indicates the height as a function of barometric static pressure in the atmosphere.
a) True
b) False
Explanation: Altimeter indicates the height as a function of barometric static pressure in the atmosphere. Altimeter reading is the reading of individual mechanical instrument which calculates the pressure. During these calculations some corrections are made to avoid errors that are caused due to mechanical tolerance.
8. What is meant by pressure altitude?
a) It is the indicated altitude measured with respect to appropriate datum pressure setting
b) It is the indicated altitude measured with respect to appropriate gauge pressure setting
c) It is the indicated altitude measured with respect to appropriate static pressure setting
d) It is the indicated altitude measured with respect to appropriate vacuum pressure setting
Explanation: Pressure altitude it is the indicated altitude measured with respect to appropriate datum pressure setting. It is corrected for static pressure error. This error is caused due to the static source being located within the disturbed pressure field caused due to presence of aircraft.
9. What is meant by geopotential height interval?
a) It is the pressure height interval measured by the pitot-static tube
b) It is the pressure height interval measured by the altimeter
c) It is the temperature height interval measured by the pitot-static tube
d) It is the temperature height interval measured by the altimeter
Explanation: Geopotential height interval it is the pressure height interval measured by the altimeter. Geopotential height interval is corrected for temperature difference from ISA model atmosphere.
10. The geopotential height of the isothermal lower stratosphere (i.e. at 11km) is given by __________
a) H=11000-\(\frac{RT_{11}}{g_0}\)ln(\(\frac{p}{p_{11}}\))
b) H=11000-\(\frac{RT_{11}}{g_0}\)ln(\(\frac{p_{11}}{p}\))
c) H=11000+\(\frac{RT_{11}}{g_0}\)ln(\(\frac{p}{p_{11}}\))
d) H=11000+\(\frac{RT_{11}}{g_0}\)ln(\(\frac{p_{11}}{p}\))
Explanation: The height of the isothermal lower stratosphere is given by H=11000-\(\frac{RT_{11}}{g_0}\)ln(\(\frac{p}{p_{11}}\)) where,
H=geopotential height
R=characteristic gas constant
T11=temperature at 11km
P11=pressure at 11km
g0=acceleration due to gravity
p=pressure.