DGCA Technical General: Basic Aerodynamics & Airflow Questions
135 exam-style Basic Aerodynamics & Airflow questions for the DGCA Technical General paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
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Q1
A unit of measurement of pressure is:
- A kg/square dm
- B kg/cubic metre
- C Newtons
- D psi
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Correct answer: D. psi
Pressure is force per unit area, and pounds per square inch expresses exactly that. The Newton alone is a unit of force, kilograms per cubic metre is density, and kilograms per square decimetre is a mass distribution, not a pressure.
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Q2
Newton's second laws states that .........?
- A F= MA.
- B F = MIA.
- C A = MF.
- D M= AF.
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Correct answer: A. F= MA.
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Q3
Which of the following are the correct SI units ?
- A Density is kilogram’s per cubic metre, Force is Newtons
- B Density is Newton’s per cubic metre, Force is kilogram’s
- C Density is kilogram’s per Newton, Force is Newton-metre squared
- D Density is kilogram’s per square metre, Force is kilogram’s
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Correct answer: A. Density is kilogram’s per cubic metre, Force is Newtons
In the SI system density is mass per unit volume, kilograms per cubic metre, and force is measured in Newtons. The kilogram is a unit of mass, not of force, which rules out the other combinations.
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Q4
The direction of static air pressure is ..... ?
- A Parallel to dynamic pressure.
- B Normal to dynamic pressure.
- C In all directions.
- D In no directions.
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Correct answer: C. In all directions.
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Q5
What is the SI unit of density?
- A m V squared
- B kg/square cm
- C kg - metres
- D kg/cubic metre
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Correct answer: D. kg/cubic metre
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Q6
Bernoulli's theorem states that.. .. ..?
- A Air is incompressible.
- B Total pressure is constant.
- C Air has viscosity.
- D Air does not expand.
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Correct answer: B. Total pressure is constant.
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Q7
What is the SI unit which results from multiplying kg and m/s squared?
- A Newton
- B Psi
- C Joule
- D Watt
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Correct answer: A. Newton
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Q8
The SI units of mass and weight are .... and ......?.
- A Kilograms, Newtons.
- B Newtons, Kilograms.
- C Kilograms, Kilograms.
- D Newtons, Newtons.
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Correct answer: A. Kilograms, Newtons.
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Q9
Which of the following expressions is correct:
- A A = F x M
- B F = M x A
- C M = F x A
- D A = M / F
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Correct answer: B. F = M x A
Newton's second law states that force equals mass multiplied by acceleration, F = m x a. The other rearrangements would make acceleration or mass the product of the other two quantities, which is dimensionally wrong.
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Q10
The SI units of density and velocity are .... and ..... ?
- A Kilograms per cubic centimetre, Centimetres per second.
- B Kilograms per cubic metre, Metres per second.
- C Newtons per cubic gram, Kilometres per minute.
- D Kilograms per cubic kilometre, Cubits per second.
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Correct answer: B. Kilograms per cubic metre, Metres per second.
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Q11
250. The deflection of the pointer of the Airspeed Indicator is proportional to:
- A dynamic pressure.
- B static pressure.
- C the difference between static and dynamic pressure.
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Correct answer: A. dynamic pressure.
The ASI capsule has pitot pressure inside and static pressure around it, so its deflection follows the difference between them, which is the dynamic pressure; the pointer movement is therefore proportional to dynamic pressure.
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Q12
Which of the following is the equation for power?
- A N/m
- B Nm/s
- C Pa/s squared
- D Kg/m/s squared
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Correct answer: B. Nm/s
Power is the rate of doing work, and work is force times distance, measured in Newton-metres (joules). Power is therefore Newton-metres per second, which is the watt.
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