# Multiple Choice (1 Viewer)

#### SDuke

##### Member
Can someone post thier MC answers, i want to compare it with mine.

The hydropower one really got me.

#### Seanus1123

##### New Member

not sure if correct, and can't be arsed finding out.
D C D B C A B A D A

What were yours?

#### SDuke

##### Member
mines C C D B C A D A B B

Though MC is my weak side, so i know i got alot wrong

#### **BORED**

##### out calls only
1. A
2. C
3. D
4. B
5. B
6. A
7. B
8. A
9. C *
10. A

except for 9. im pretty confident

#### chaotichampster

##### New Member
CCDBCABABD

I'm not sure for the last two, but im really sure q1 is C.

#### **BORED**

##### out calls only
i doubt that, A, would be so much quicker and easier.

#### richz

##### Active Member
wtf, why would u blow mould a hat.......

#### indeecent

##### New Member
yeah he is right... 1 isnt blow moulded
1. c (think is right, none of the others work, u dont blow mould anything but cups n bottles)
2. c (right using formula, f = 0.5 x 200)
3. d (only one i thought possible)
4. b (its not the others and this is what is required)
5. c (this one was not a,b, or d, due to the difference in area by 4 per cylinder, meaning 8 total)
6. a (right)
7. b (thought this cuz the question was about supply grid)
8. a ( i think is right, physics dont fail me now)
9. c (not sure)
10. b (right, the sum of moments goes 1x1 - 3x3 = 0; hence its 8kNm clockwise)

tell me whats right n not, and prove me wrong

i thought it was a fkn easy exam

#### skylinegtts

##### New Member
thought id post up my MC answers aswell
A C D B B A B A D B
for q1 i took a jab at it cause theres a sorta lip around the whole helmet which made me think it was blow moulding

c
c
d
b
c
a
b
c
a
a

#### robb_doggy

##### New Member
go dist. ed u good thing

#### SDuke

##### Member
Isnt blow moulding for glass?

#### gavmen

##### New Member
btw for question 7 i thought the answer was D because for hydro electrictiy it is more efficient than all the other methods because its source, the water, is pushed by gravity though pipes (sometimes thinner to increase pressure) to turn a turbine where as all the other forms of electricity require the heating of water (excluding wind power) i.e. power loss in the process of transforming heat energy to electrical energy vs pressure from water => electrical energy. hence are more efficient.

i disagreed with B which was to quickly supply energy when required, due to the fact that Hydro electric energy is quite scarce and that its energy produced couldnt spike enough to provide energy at a high enough rate to feed the load, but i remember somewhere on a snowy mountains trip to the hydro dams where they said they could turn on back up turbines to increase energy output... but it cant produce that much..... the highest amount of hydro dams is in china or something and its only 10-20% of their overall power usage

cheers

gav

#### indeecent

##### New Member
u do realise most of south nsw's and north vic's power comes from the snowy river scheme yeah? and read the question, its not about how its made, its about why its used for POWER GRIDS, meaning it would have to have something to do about supply and demand

and check ur moment calculations for 10, its -8kn in anticlockwise, check it, the pivot point is the wall, so its 1kN x 1m - 3m x 3kN, which means in clockwise its +8, and theres only one answer that has that

question 7 is "Why is hydro-electric power generation useful as a component of an ELECTRICAL POWER SUPPLY GRID?" people, watch your keywords...

#### gavmen

##### New Member
10% of NSW electricity is produced by the Snowy Mountains Hydro Electric Scheme
http://www.greenpeace.org.au/climate/solutions/renewables/hydro.html

mmm 10% = most

so does 10% = your score = most?

and an electrical power supply grid is SUPPLIED by the source i.e. hydro electricity which is more efficient for the reasons stated above

however
supply and demand dictates that it is indeed true that the hydro electric dam can produce an extra 10%~ on short notice by turning on the emergency turbines

cheers

gav

#### SDuke

##### Member
For question 7 i was tossing btw C and D.

A - u dont really know, depends really on the infrastructure

B - relatively quickly? relative to what? I havent done any research but i thought it would take a long time to turn it on and off for hydro power.

Though i have to admit, this years MC was much easier than last yrs.

#### MrDevil2U

##### New Member
injection moulding

I thought Q1 was c - injection moulding - you can see the injection point on top

#### mattplaysguitar

##### New Member
YESSSSSSSSSSSSSSSSSSS UR R RIGHT!! i saw that as well and thought instantly what it was, those other dumb people, its so bloody obvious, that really was a free mark that question

#### nayf

##### New Member
SDuke said:
For question 7 i was tossing btw C and D.

A - u dont really know, depends really on the infrastructure

B - relatively quickly? relative to what? I havent done any research but i thought it would take a long time to turn it on and off for hydro power.

Though i have to admit, this years MC was much easier than last yrs.
yeh i said it could easily be turned on and off when energy is in demand.

#### gazzaed

##### New Member
Can anyone give a definite answer on Q9?