CITY AND GUILDS LEVEL 3 AERONAUTICAL ENGINEERING
NEWEST ACTUAL UNIT 215 WITH COMPLETE QUESTIONS AND
ANSWERS// VERIFIED//GRADEDED A+/
Proportion equation (Direct):
y = kx
Proportion equation (Inverse):
y = k/x
Standard form equation:
a x 10^n
Convert 75 inches to metres (1 inch = 0.025 m).
75 x 0.025 = 1.875 m
Name two SI base units used in aviation.
Metre (m) for length, kilogram (kg) for mass.
Page 1 of 27
,What is the difference between absolute and relative error?
Absolute = actual difference; Relative = difference as a
percentage of true value.
Convert 200 psi to Pascals (1 psi ≈ 7000 Pa)
200 x 7000 = 1 ,400,000
What is the prefix and value of 'kilo'?
10^3
List three US Customary units for fuel.
US gallons, pounds (lb), and litres (converted values).
When is absolute error critical in aviation?
Fuel loading, pressure readings, or weight-and-balance
checks.
What is the symbol for pressure in SI units?
Pascal (Pa)
Page 2 of 27
, Convert 101.3 kPa to psi.
Approx. 14.7 psi
Why is unit consistency essential in aeronautical formulae?
To avoid catastrophic miscalculations (e.g., Mars Climate
Orbiter crash due to unit error).
What is the HCF of 18 and 30?
6
Convert 0.375 to a fraction in its simplest form.
3/8
What is the difference between direct and inverse proportion?
Direct: as one increases, the other decreases. Inverse: as one
increases, the other decreases.
Estimate 19.8 x 4.1 to 1 significant figure.
20 x 4 = 80
Page 3 of 27
NEWEST ACTUAL UNIT 215 WITH COMPLETE QUESTIONS AND
ANSWERS// VERIFIED//GRADEDED A+/
Proportion equation (Direct):
y = kx
Proportion equation (Inverse):
y = k/x
Standard form equation:
a x 10^n
Convert 75 inches to metres (1 inch = 0.025 m).
75 x 0.025 = 1.875 m
Name two SI base units used in aviation.
Metre (m) for length, kilogram (kg) for mass.
Page 1 of 27
,What is the difference between absolute and relative error?
Absolute = actual difference; Relative = difference as a
percentage of true value.
Convert 200 psi to Pascals (1 psi ≈ 7000 Pa)
200 x 7000 = 1 ,400,000
What is the prefix and value of 'kilo'?
10^3
List three US Customary units for fuel.
US gallons, pounds (lb), and litres (converted values).
When is absolute error critical in aviation?
Fuel loading, pressure readings, or weight-and-balance
checks.
What is the symbol for pressure in SI units?
Pascal (Pa)
Page 2 of 27
, Convert 101.3 kPa to psi.
Approx. 14.7 psi
Why is unit consistency essential in aeronautical formulae?
To avoid catastrophic miscalculations (e.g., Mars Climate
Orbiter crash due to unit error).
What is the HCF of 18 and 30?
6
Convert 0.375 to a fraction in its simplest form.
3/8
What is the difference between direct and inverse proportion?
Direct: as one increases, the other decreases. Inverse: as one
increases, the other decreases.
Estimate 19.8 x 4.1 to 1 significant figure.
20 x 4 = 80
Page 3 of 27
