DGCA Technical General: Basic Aerodynamics & Airflow Questions
135 exam-style Basic Aerodynamics & Airflow questions for the DGCA Technical Generalpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
A unit of measurement of pressure is:
- Akg/square dm
- Bkg/cubic metre
- CNewtons
- Dpsi
Show answer
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.
- Q2
Newton's second laws states that .........?
- AF= MA.
- BF = MIA.
- CA = MF.
- DM= AF.
Show answer
Correct answer: A. F= MA.
This Explanation is Coming Soon
- Q3
Which of the following are the correct SI units ?
- ADensity is kilogram’s per cubic metre, Force is Newtons
- BDensity is Newton’s per cubic metre, Force is kilogram’s
- CDensity is kilogram’s per Newton, Force is Newton-metre squared
- DDensity is kilogram’s per square metre, Force is kilogram’s
Show answer
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.
- Q4
The direction of static air pressure is ..... ?
- AParallel to dynamic pressure.
- BNormal to dynamic pressure.
- CIn all directions.
- DIn no directions.
Show answer
Correct answer: C. In all directions.
This Explanation is Coming Soon
- Q5
What is the SI unit of density?
- Am V squared
- Bkg/square cm
- Ckg - metres
- Dkg/cubic metre
Show answer
Correct answer: D. kg/cubic metre
This Explanation is Coming Soon
- Q6
Bernoulli's theorem states that.. .. ..?
- AAir is incompressible.
- BTotal pressure is constant.
- CAir has viscosity.
- DAir does not expand.
Show answer
Correct answer: B. Total pressure is constant.
This Explanation is Coming Soon
- Q7
What is the SI unit which results from multiplying kg and m/s squared?
- ANewton
- BPsi
- CJoule
- DWatt
Show answer
Correct answer: A. Newton
This Explanation is Coming Soon
- Q8
The SI units of mass and weight are .... and ......?.
- AKilograms, Newtons.
- BNewtons, Kilograms.
- CKilograms, Kilograms.
- DNewtons, Newtons.
Show answer
Correct answer: A. Kilograms, Newtons.
This Explanation is Coming Soon
- Q9
Which of the following expressions is correct:
- AA = F x M
- BF = M x A
- CM = F x A
- DA = M / F
Show answer
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.
- Q10
The SI units of density and velocity are .... and ..... ?
- AKilograms per cubic centimetre, Centimetres per second.
- BKilograms per cubic metre, Metres per second.
- CNewtons per cubic gram, Kilometres per minute.
- DKilograms per cubic kilometre, Cubits per second.
Show answer
Correct answer: B. Kilograms per cubic metre, Metres per second.
This Explanation is Coming Soon
- Q11
250. The deflection of the pointer of the Airspeed Indicator is proportional to:
- Adynamic pressure.
- B static pressure.
- C the difference between static and dynamic pressure.
Show answer
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.
- Q12
Which of the following is the equation for power?
- AN/m
- BNm/s
- CPa/s squared
- DKg/m/s squared
Show answer
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.
123 more Basic Aerodynamics & Airflow questions in the full bank
Create a free account to practise every Basic Aerodynamics & Airflow question with instant scoring, chapter tests, previous DGCA papers and full-length mock exams.
Start practising free