Faculty of Engineering & Transport

THERMODYNAMICS I - SAMPLE TEST 1

EXAMINATION CONDITIONS

National Module EA714
TAFE Subject 7760B
Time Allowed 2 hours
Calculators may be used.
Attempt all questions
Show all working
TOTAL MARKS 100
This test is worth 45% of your assessed mark.
Marks for questions are shown in [square] brackets.

DATA & FORMULAE

P = F * v = W / t	Cp Air 1005 KJ/kgK
W = Energy = F * s	Cp Water 4.19 KJ/kgK
Q = m * Cv * D T	Density Air 1.2 kg/m3
F = M * a	Latent Heat Fusion 335 KJ/kg.
Q = M * L

Question 1.

1 (a) Discuss three major mineral energy resources of the world. Your answer should mention the pollution generated, the future availibility and the ease of use of the resource. [10]

1(b) Name three non mineral energy resources, and give a brief explanation of each in terms of maximum potential availibility, and the technology required to utilize the energy resource (whether it exists, or must be invented). [10]

Question 2. Multiple Choice. [3 marks each]

(1) What are the metric units of pressure?

Watts per square meter
Watts.
Pascals per square meter
Newtons per square millimeter
Pascals

(2) What is the value in Kelvin of -40 C?

-40K
313K
233K
273K
Freezing point, 0 K (zero K)

(3) If atmospheric pressure is 0.1013 MPa, what is the absolute pressure of a tank on which a bourdon gage reads -35 Kpa?

351 Kpa.
136.3 Kpa
35.1013 Kpa
66.3 Kpa
None of these.

(4) Which equation gives the formula for density? r = Density.

r = Volume/weight(N). (m^3/M*g)
r = Mass(Kg)/Volume. (M/m^3)
r = Volume/ Mass(Kg) (m^3/ M)
r = Weight(N)/Volume. (M*g / m^3)
r = Pressure/Volume (Pa/m^3)

(5) What are the units of specific volume?

(m3/M*g)
M/m^3
m3/ M
M*g / m^3
Pa/m^3

(6) Which units are equivalent to Watts?.

1 Watt = 1 N*m/Sec^2
1 Watt = 1 kg*m/Sec^2
1 Watt = 1 N*m/Sec
1 Watt = 1 kg*m/Sec
1 Watt = 1 J/Sec^2

(7) Which units are equivalent to Joules?

1 Joule = 1 N*m/Sec^2
1 Joule = 1 kg*m^2/Sec^2
1 Joule = 1 N*m
1 Joule = 1 kg*m/Sec
1 Joule = 1 Watt/Sec^2

Question 3. [9]

An insulated tank for an outboard motor test contains 500 L of water at 20 C. The motor delivers 40 KW to the propellor. What will the temperature of the water be after a 15 minute test?

Question 4. [15]

A block of Ice is placed into a bucket with two dozen cans of beer. How many kg of ice are required if the cans (special 600ml) are at 35 degrees C, and are to be cooled to 0 deg. C ? Ignore the mass of the cans, take Cp of beer as 4.0 KJ/kg. & Density beer = Density water.

Question 5. [15]

A bomb calorimeter experiment had the following data:
         Mass fuel   0.9g.
         Mass Water   1.95kg.
         Initial Water Temp.   20.45C
         Final water Temp. 21.87C
         WE of calorimeter 0.75kg.
         Calculate the calorific value of the fuel.

Question 6. [10]

A car radiator cools 30 l/min of water from 95C to 55C. If the flow of air is 500 m^3 per minute, calculate the temperature rise of the air.

Question 7 [10]

A train of mass 150 tonnes rolls down a slope of 4 degrees for a distance of 3 Km. If the resistance to motion is 50 KN, find:
a) The difference between the potential energy at the top and the bottom of the hill.
b) The speed of the train at the bottom of the slope.

Back to Thermodynamics Results page.

Email: sit@sydney.net