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Prelim engineering revision

Total questions: 30

Worksheet time: 15mins

Name
Class
Date
1.
What is the Mechanical Advantage of a machine if a 30 N force lifts a 20 kg load?
a)
5.67
b)
6.67
c)
7.0
d)
8.0
2.
What is the effort required to lift a load of 300 N if a lever is 1.5 m long and a fulcrum is placed 300 mm from the load?
a)
70 N
b)
75 N
c)
80 N
d)
85 N
3.

If the maximum force resisting shear offered by the sheet metal is 0.85 kN, find the effort force required.

a)
206 N
b)
210 N
c)
220 N
d)
230 N
4.
Calculate the force which must be applied to the handle to hold a wheelbarrow up with a load of 46 kg.
a)
150 N
b)
184 N
c)
190 N
d)
220 N
5.
What is the force required at E to balance a 5kg rock on a shovel used as a lever?
a)
10 N
b)
13 N
c)
15 N
d)
18 N
6.
What structure do most metals form?
a)
Amorphous
b)
Crystalline
c)
Polymer
d)
Liquid
7.
What is the primary constituent of ferrous metals?
a)
Carbon
b)
Zinc
c)
Iron
d)
Aluminium
8.
What is main use for copper due to its properties?
a)
Structural material
b)
Electrical conductor
c)
Decorative arts
d)
Thermal insulation
9.
Which alloy is made of copper and tin?
a)
Brass
b)
Bronze
c)
Steel
d)
Zinc
10.
What process involves heating a material to a specific temperature and cooling slowly?
a)
Quenching
b)
Annealing
c)
Precipitation hardening
d)
Sintering
11.
What does “alloying” typically improve?
a)
Cost
b)
Weight
c)
Desired properties
d)
Appearance
12.
What does a parallel circuit provide that a series circuit does not?
a)
Less complexity
b)
Different voltage for components
c)
Constant variables
d)
More wiring
13.
Which material is used primarily for its high tensile strength in electrical contexts?
a)
Rubber
b)
Plastic
c)
Copper
d)
Wood
14.
What is the tool used to measure electrical resistance?
a)
Voltmeter
b)
Ohmmeter
c)
Ammeter
d)
Thermometer
15.
What is the effect of increased carbon content in quenched steel?
a)
Increased ductility
b)
Reduced brittleness
c)
Increased hardness
d)
Reduced corrosion
16.
Which property makes wood advantageous for engineering purposes?
a)
Chemical stability
b)
Malleability
c)
Regenerability
d)
Conductivity
17.
Which process is opposite to casting in forming materials?
a)
Rolling
b)
Extruding
c)
Annealing
d)
Cutting
18.
What physical property can steel not possess due to its atomic arrangement?
a)
High corrosion resistance
b)
High temperature resilience
c)
Malleability
d)
Transparency
19.
What is the primary microstructure found in steels with low carbon content?
a)
Austenite
b)
Ferrite
c)
Cementite
d)
Martensite
20.
Which phase in steel microstructure is characterized by being very hard and brittle due to high carbon content?
a)
Ferrite
b)
Austenite
c)
Cementite
d)
Martensite
21.
What steel microstructure is formed from alternating layers of ferrite and cementite?
a)
Martensite
b)
Pearlite
c)
Bainite
d)
Sorbite
22.
What is the transformed microstructure that results from quenching austenite?
a)
Pearlite
b)
Martensite
c)
Ferrite
d)
Sorbite
23.

What is the total resistance of this circuit?

a)

  • 15.4 ohm

b)

1.2 ohm

c)

23 ohm

d)

2.4 ohm

24.

What is the total resistance of this circuit?

a)

3.8 ohm

b)

5.5 ohm

c)

8.3 ohm

d)

6 ohm

25.

A block of mass 250 kg rests on a horizontal surface. The coefficient of friction between the block and the surface is 0.15

a)

35 N

b)

55 N

c)

375 N

d)

250 N

26.

What is the highest point on a stress strain curve?

a)

Yield strength

b)

proof strength

c)

ultimate tensile strength

d)

strain

27.

What are some characteristics of cold worked steel?

a)

lower strength, higher ductility

b)

lower temperature

c)

higher strength, lower ductility

d)

higher toughness, higher strength

28.

What is the resultant force on the pin joint?

a)

132 N

b)

180 N

c)

150 N

d)

145N

29.

Cylinder A has a cross-sectional area of 100 mm2, cylinder B has an area of 700 mm2. Calculate the force on rod y when a 50N force is applied to x

a)

350 N

b)

450 N

c)

50 N

d)

72 N

30.

find the force needed to raise the front wheels of the mower if it has a mass of 17kg.

a)

35 N

b)

50 N

c)

85 N

d)

225 N

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