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Test your basic knowledge |
Power Engineering
Start Test
Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The moment of a force about a point is...
The equilibrant
Complementary angles
Malleability
A twisting or turning effect
2. A body having a gravitational force of 2000 N - is pulled along a horizontal surface at constant speed by a rope that makes an angle of 20
0.0723
The elastic limit of the material is not exceeded
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Conditions required to produce sulphide corrosion cracking
3. Work done(J)/time(second) - unit of watts - 1 watt = 1 joule/second
Mass x acceleration (N)
Purpose of material balance
Power
45 kN
4. A triangle with two equal sides
A number with the necessary unit
1. have a basic effect 2. have an acid effect 3. be neutral 4. change red litmus paper blue
Heat engines
Isosceles triangle
5. A gas occupies 8.62 m3 at 1800 kPa and 26
elasticity
179.02
161
Adiabatic
6. When heat is supplied to a liquid in sufficient quantity to change the liquid to a vapour without changing the temperature - the heat supplied is known as...
Rhombus
Sulfuric acid
Latent heat of evaporation
Specific heat
7. Pm = mean effective pressure (Pa) - A= area of piston (m2) - L= length of stroke (m) - N= number of power strokes per second
White metal and bronze
benefits of chromium
520.72 kJ/kg
To calculate power from an engine
8. A scalar quantity is one which has only magnitude and can be fully described by...
A number with the necessary unit
Sensible heat
Value of the angle increases
Output power(W)/input power(W)
9. Velocity ratio is...
Areas of sectors (bounded by 2 radii and arc between them)
A solution
Ideal mechanical advantage
Material balance
10. Quantity of heat required to change the temp of a unit mass of a substance by 1 degree
ellipse
A Greek letter alpha linear
Specific heat
basic oxygen process
11. The temperature of saturated steam vapor at 980 kPa is...
M x g x h (kg x 9.81 m/s/s x height (m))
Charles Law
displacement
179.02
12. The term _____ is used as a measure of the quantity of matter.
Transformed to different forms
Mass
161
Scalene triangle
13. Pre- construction - shows graphically the mechanical design engineer's work - during construction - proper location - reference to all equipment - after construction - training reference anddetails of process - utility and electrical systems
M x g x h (kg x 9.81 m/s/s x height (m))
Purpose of P & IDs
Output power(W)/input power(W)
White
14. Being made of 2 or more substances creating unique characteristics and properties when combine
View of a cutting plane
Composite material
Opposite side / hypotenuse
hardness
15. The factor of safety is always expressed...
Boyle's law
benefits of chromium
General gas law
As a ratio
16. Is the rate a body moves in a specific direction - direction must be specified - velocity(m/s) = displacement(m)/time(s)
linear motion relationships
velocity
Stroke
latent heat of evaporation (vaporation)
17. A closed plane figure bounded by straight sides
polygon
A number with the necessary unit
Stroke
Boyle's law
18. According to Hooke's Law - the stress in an elastic body is directly proportional to the strain if...
elasticity
Boyle's law
The elastic limit of the material is not exceeded
1 cm
19. The precise measurement of heat flow out of a system for chemical and physical processes
Details of P & IDs
Problem solving order
Ammonia
Calorimetry
20. Kinetic energy (Ek)
hardness
1/2mv2 (kg x velocity(m/s))
Rhomboid
Total heat required for change of state
21. The most common scale in use is the...
Celsius
Falling temperature
Conditions required to produce sulphide corrosion cracking
A / SinA = b / SinB = c / SinC
22. Pythagoras' Theorem
A
benefits of copper
A / SinA = b / SinB = c / SinC
water equivalent
23. Sine Rule
benefits of chromium - nickel and copper in alloy steels
4.4 m/s
Scalene triangle
A / SinA = b / SinB = c / SinC
24. A closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it A = piab or A = pi(1/2D)(1/2d) - same as = (pi/4)D/d
Value of the angle increases
Stroke
displacement
ellipse
25. A 1 N weight has a kinetic energy of 1 J when its speed is...
Resultant
4.4 m/s
A. sine of 90
Ideal mechanical advantage
26. Dangerous because a crack starts slowly and propagate slowly - exceed breaking strength and the metal fails suddenly - stress must be tensile can be produced by an external load or residual stress - condensed moisture and change in temperature
Stress corrosion cracking
A solution
basic oxygen process
Gamma - coefficient of superficial = 2x coefficient of linear expansion
27. Force(N) x distance(m) or W=Fd - unit of joules - 1KJ = 1000J = 1000Nm = 1KNm - 1MJ = 1000000J = 1000000NM = 1MNm
0.0723
Work
A
2.3026
28. When calculating the ultimate stress of a material - we should
Divide the maximum load by the original cross - sectional area
Gamma - coefficient of superficial = 2x coefficient of linear expansion
Boyle's law
benefits of chromium
29. Factor of safety
Mensuration
elasticity
0.0723
Ultimate stress/working stress
30. The parts/fraction of steam that is dry is called dryness fraction - o expressed as a fraction - percentage or decimal
dryness fraction
Dividing the ultimate strength by the factor of safety
520.72 kJ/kg
More than 90 degrees
31. coefficient of superficial (area) expansion
Octagon
Complementary angles
Toughness
Gamma - coefficient of superficial = 2x coefficient of linear expansion
32. A 6 m long cantilever beam carries a concentrated load of 45 kN at its free end. What is the shear force at the wall?
Power
Work
linear motion relationships
45 kN
33. In a pipe if no fluid is added or removed - flow must remain constant - due to the product of area and velocity being constant - flow must be the same going in as coming out of pipe
0.89
Continuity flow
White
Greater than 180 degrees
34. When the co- efficient of friction increases and the force between two surfaces remains constant - the friction force will
Greater than 180 degrees
Calorimetry
Increase
Ammonia
35. Whether a material will break under sudden impact or hard blow
White
A solution
Dividing the ultimate strength by the factor of safety
Toughness
36. If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10
Celsius
Pm x A x L x N
110.6 kPa
Material balance
37. A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the...
Resultant
45 kN
Process flow drawing
elasticity
38. Is a number that appears naturally in some higher- level mathematics is 2.71828 (correct to 5 decimal places)
Naperian (Natural) logarithms
1/2mv2 (kg x velocity(m/s))
0.89
distance
39. Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear
The specific heat of the material
White
A / SinA = b / SinB = c / SinC
Work
40. PV=nRT - Boyle's law and Charle's law combined
Calorimetry
Complementary angles
Output power(W)/input power(W)
General gas law
41. Moist hydrogen sulphide environment - hydrogen sulphide must be present - water - even trace amount - high strength steel - steel must be under tensile stress - either applied or residual
The equilibrant
distance
M x g x h (kg x 9.81 m/s/s x height (m))
Conditions required to produce sulphide corrosion cracking
42. Force
Mass x acceleration (N)
Trapezoid
Isosceles triangle
Malleability
43. Sensible heat + total latent heat - mc(specific heat) x delta t + mLf/mLe - Lf = latent heat of fusion - Le = latent heat of evaporation
benefits of chromium
520.72 kJ/kg
Total heat required for change of state
water equivalent
44. Resists oxidation - high strength at high temperatures - increases hardness and abrasion resistance without increasing brittleness - increases response to heat treatment - increases depth of hardness penetration - at 12% chromium steel with not tarni
1/2mv2 (kg x velocity(m/s))
45 kN
benefits of chromium
Cast iron
45. Cosine rule
Trapezium
Falling temperature
Unified National
A
46. 1. In a right angle triangle - the sine of an acute angle is equal to...
Opposite side / hypotenuse
Transformed to different forms
General gas law
Ammonia
47. When classifying beams - the term simple beam refers to a beam
Sulfuric acid
brinell hardness test
That is supported at two ends
45 kN
48. A parallelogram with four equal sides
linear motion relationships
Rhombus
Continuity flow
benefits of nickel
49. In the equation 0.004 + D = 0.0042 - the value of D is...
0.0002
dryness fraction
A solution
Less than 90 degrees
50. A polygon with 6 sides A = 0.433s2 for equilateral triangle - therefore a hexagon A = 6 x 0.433s2 or A = 2.6s2
Resultant
benefits of nickel
effective pressure
hexagon