ROYAL NAVY DEFENCE APTITUDE ASSESSMENT (DAA) MECHANICAL COMPREHENSION TEST QUESTIONS AND ANSWERS! 

Get 100s of ROYAL NAVY DEFENCE APTITUDE practice questions and fully-worked answers here: www.how2become.com/rn-defence-aptitude-assessment/ Good luck everyone! 🙂

Q1. Clockwise Q2. Anti-Clockwise ( as connected by chain/belt so will move in the same direction ) Q3. Cog B ( because Smaller cogs rotate more than larger cogs ) Q4. A Q5. C Q6. D Q7.Z since it has more supporting ropes Q8. 147N ( there are 2 supports connected directly to the 60kg and each one is connected to 2 ropes so 4 connected ropes overall 60/4 = 15 15 x 9.8 = 147N Q9. B (because pulley System B has no supporting ropes / mechanical advantage ) Q10. 13.333kg ( weight x distance from fulcrum/triangle to weight ) 10 x 2 = 20 (distance from the fulcrum to where the weight will be applied is 1.5 m ) 20/1.5 = 13.3333kg Q11. 4kg (same reasoning as above ) Q12. 3.6 km Ship is travelling 0.8m/s + the flow of 0.2m/s = ship is travelling at 1m/s 1 hour = 3600 seconds = 3600 meters as the ship is travelling 1 metre every second 3600m = 3.6km Q13. A ( as this is the shortest distance between the pivot and the pendulum ) Q14. B ( Due to the angle gravity will increase the velocity of the ball falling to the ground compared to A where it would roll down slower ) Q15. A ( you would have to move it closer as despite them being the same size they are different sizes/ weight ) Q16. B ( This is because in a level container pressure is exerted on the bottom due to gravity. This pressure is equal in all directions at the same depth within the liquid. To maintain equilibrium the water weould flow from the high pressure (wide area) A to the low pressure (area B) and vice versa until the water levels on both sides were the same. Q17.A ( they are the same weight which is why they are equally balanced ) Q18. C ( it would balance closer to the heavier weight, moving a beam closer to the lighter weight would result in structural failure ) Q19. A ( : The longer support provides better leverage, reducing the bending moment and stress on the material, making it less likely to break compared to a shorter support holding the same shelf) Q20. B ( At the centre of its swing, the bob has minimal potential energy (it's at its lowest point) and has converted most of that energy into kinetic energy, making it reach its maximum speed.

10- 13.33kg (2 decimal places could be written as 40/3) 11- 4kg you are a legend bro can't emphasise how much your helping me

Can someone explain at 5:37 where 10 comes from? If it represents the teeth of cog A, then why does he do 10(Cog A teeth) / 1.5 (cog B size) ? That's an inconsistent operation

Did my test today with little preparation (i admit i underestimated the test). I managed to pass but i need 10 more percent for the officer role i want, this video helped alot!

I want to do engineering just done the test 2nd time got good marks in everything except from mechanical comprehension was one mark off(my recruiter told me) this video was helpful so hopefully 3rd time I get what I need.

5- C 6-D 7-Z

I wish youd just put the correct answers after the questions

I've just failed my DAA and being in the navy is something I've wanted for years and I failed this part specifically but it had nothing to do with anything mechanical I was so confused when I got asked about a volcano

The pully systems were taught poorly, I understand it, however that is only because I was taught ells where, the way you count the supporting ropes was not clear, you sort of just gave us a number with little to no explanation, and the way of calculating the force behind a pully rope was also a little lack lustre maybe a brief explanation on what mechanical advantage is as well.

In Q4, cog B looks smaller than cog A, so why does it not rotate faster than cog A?

1 - b clockwise 2 - b anti-clockwise 3 - c equal number 4 - anti 20

i don't understand question 4,also these videos are point less if you can explain the answers for the questions

Hi. For question 8 is there 4 or 5 supporting ropes?

Thank you for this informative video. Can you kindly answer Q12 for us please?

q1- clockwise q2- anti clockwise q3- cog b q4- clockwise at 10 rpm q5- 3 q6- 4 q7- pulie z q8- not sire q9- answer is c q10- 13.3 q11- 4 q12- not sure q13- pendulm d q14- c there would be land at the sametime q15- point c q16- both the same q17- both same q18- point c q19- self a q20-point a and c

On question 9, I'm struggling to understand why option D is more effective than option B? I understand that pulley B is just changing the direction of the force with no MA, but why does Pulley D have an advantage? The only difference I see is Pulley B is Fixed, and Pulley D is movable, with opposite force directions.

The Generals questions didnt seem to be explained?

Could you please explain the answer to question 12?

how do you work out question 12 im very stuck on it do i have to convert the m/s to hours and why is there two different speeds?

hi , im a bit confused on how to count the number of supporting ropes ?

how do you work out question 12, i looked at your answer i defiantly didnt get 3.6km, i need help

For question 8, how did you arrive at 147N? I'd appreciate it if you could explain it. Thanks in advance.

Is question 17. A - both the same?

for the description of pulleys is the equation not: MASS / number of supports x 9.8?

are these questions similar for those applying for the commandos?

1) B 2) B 3) B 4) C 5) C 6) D 7) Z 8) 147 9) D 10) 13.3KG 11) 4KG 12) 0.06KM 13) D 14) B 15) A 16) C 17) C 18) C 19) A 20) A

Some of my answers below Q13 Pendulum A Q14 Ball B Q15 Point A Q16 tube B Q17 A both the same Q18 point C Q19 A is the weakest? Q20 Point B? Are these correct? Thanks

Q1. Clockwise

Q1 B Q2 B Q3 B Q4 A Q5 C Q6 D Q7 Z Q8 147 Q9 B Q10 I Got 13.3 recurring (I used a calculator. Am I allowed to use a calculator?!?) Q11 4kg (didn’t use a calculator thankfully 🤣) Q12 I literally have no idea Q13 I feel like it’s A because it has less mass to swing at the bottom 🤣 my logic didn’t get included in the episode Q14 HAS TO BE B! Q15 Logically looking at it A but idk why there’s no weight or distance. It just says the balls are made from the same material. Q16 B Q17 A Q18 C Q19 A Q20 B?? I think!

Some great teaching, but there needs to be an exact list of answers in the comments. In a few of your replies you have accutally given different answers and I believe the answer you have given someone for question 10 is also wrong. Again some good teaching, but the answers need to be made clear otherwise the questions are not useful

Q2. Anticlockwise

Q4) A - Clockwise at 20?

q1 b q2 b q3 c q4 a q5 a q6 b q7 z q8 588 newtons q9 b q10 13.3kg q11 4kg q12 100km q13 a q14 b q15 c q16 b q17 a q18 point b q19 c q20 a

8- 147

Clicked unlike button, is so stupid not to provide the answers in the video to verify ourselves; engagement farming much?

Q2 anticlockwise

Hi is this the same as the RAF test?

Q8 117.6N

Are u given any paper in the assessment

Q3 B

Cheers🤝

Can someone explain q12 please

with question 4 you keep changing your answers in the comments. Do you know which is the correct answer already?

Q4 anticlockwise 10

Q4 C

Why not just give the answers in the videos

Q5.3

1.CLOCKWISE 2.ANTI CLOCKWISE

Q1: clockwise

Q3 b

would question 9 be c? im struggling a bit

1. B

Q2: anti-clockwise

Q5 c

B,B,B,A,C,D,Z,146,B,15,4,800M,A,B,B,B,A,C,A,B.

B clockwise

Q1 clockwise

Its so lame that you dont include the answers in the video

4.C

Q6 d

1-clockwise

Q9 d

Q14 ... its C .. .

Q7 Z

Q4: Clockwise 20rpm

Question 8&9help pls

Q3: A

3. b

5 - b2 6 - c3 7 - z

Q12 - 3.6km/h

Q2 A

c

2 b

B

Q7.z

Q1 clockwise Q2 anti clockwise Q3 cog b Q4 B Q5 B Q6 C Q7 Z

Q1 B

Q6.4

4. C

Q7 Z

B

Q6.4

B