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Principles of basic mechanics

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2 Electrical Science Quiz on Principles of basic mechanics, created by Vito Martino on 12/05/2014.
Vito Martino
Quiz by Vito Martino, updated more than 1 year ago
Vito Martino
Created by Vito Martino almost 10 years ago
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Resource summary

Question 1

Question
The work needed to raise a load of 95kg to a height of 30 m is approximately
Answer
  • 28 J
  • 2.79 kJ
  • 28 kJ
  • 285 J

Question 2

Question
The pivot point of a lever is called
Answer
  • centre
  • pulley
  • Load
  • fulcrum

Question 3

Question
Calculate the MASS of the LOAD required to balance the EFFORT applied shown below.
Image:
Slide1.JPG (image/JPG)
Answer
  • 824.6kg
  • 1160.1kg
  • 118.3kg
  • 266.2kg

Question 4

Question
A motor has an input power of 3 kW and is 85 % efficient. What is the output power?
Answer
  • 2.55 kW
  • 3 kW
  • 3.53 kW
  • 2.4 kW

Question 5

Question
If an object has a mass of 50 Kg on earth, in space its mass would be
Answer
  • 100 kg
  • 490 kg
  • 50 kg
  • 41 kg

Question 6

Question
What is the power of a hoist required to lift an object of 20 kg, 20 m in 30 seconds.
Answer
  • 3.3kW
  • 1.3kW
  • 13.3W
  • 130.8W

Question 7

Question
Pliers rely on which principle for their operation
Answer
  • leverage
  • tension
  • torsion
  • friction

Question 8

Question
A motor has an input power of 50kW and an output power of 47kW. What is the efficiency of the motor?
Answer
  • 100 %
  • 86 %
  • 96 %
  • 94 %

Question 9

Question
A motor has an output power of 40kW and an efficiency of 80%. What is the input power of the motor?
Answer
  • 32 kW
  • 50 kW
  • 40 kW
  • 54 kW

Question 10

Question
The power input to a machine is 90 W and the output power is 60 W the efficiency of the machine is
Answer
  • 86 %
  • 66.6 %
  • 75 %
  • 80 %

Question 11

Question
The weight of an object is the
Answer
  • mass of the object divided by 9.81
  • the same as the mass when there is gravity
  • force acting on top of the object due to gravity
  • force acting directly below the object due to gravity

Question 12

Question
A mass of 9.5 Kg exerts a force on earth of
Answer
  • 9.3 N
  • 95 N
  • 9.5 N
  • 93.2 N

Question 13

Question
What is the power of a motor required to lift a load of mass 300kg 40m in 2 minutes.
Answer
  • 981 W
  • 6000 W
  • 98.1 W
  • 100 W

Question 14

Question
Calculate the distance D required to balance the effort and load shown
Image:
Slide2.JPG (image/JPG)
Answer
  • 5.64m
  • 6.65m
  • 4.54m
  • 6.45m

Question 15

Question
A motor has an output power of 40kW and an efficiency of 66.66%. What is the input power of the motor?
Answer
  • 30 kW
  • 60 kW
  • 50 kW
  • 70 kW

Question 16

Question
A 2kW heater is 90% efficient. The input power to the heater is
Answer
  • 5kW
  • 1.88kW
  • 3kW
  • 2.22kW

Question 17

Question
A mass of 30kg would have an weight of
Answer
  • 0.327N
  • 3.05kN
  • 3.05N
  • 294.3N

Question 18

Question
A motor has an efficiency of 73%. If the input power is 32kW, the output power available is
Answer
  • 76.64kW
  • 23.36kW
  • 22.8kW
  • 32kW

Question 19

Question
Calculate the work done when required to raise a load of 1000kg through a vertical distance of 20m.
Answer
  • 19620J
  • 20000J
  • 200000J
  • 196200J

Question 20

Question
A force of 50kN moves an object a distance of 2m. The work done is.
Answer
  • 25kJ
  • 50kJ
  • 100kJ
  • 200kJ

Question 21

Question
From the following diagram identify the Mass
Image:
Slide3.JPG (image/JPG)
Answer
  • 2.5kg
  • 10kg
  • 5kg
  • 30kg

Question 22

Question
From the following diagram what is the arrow pointing to
Image:
Slide4.JPG (image/JPG)
Answer
  • Fulcrum
  • middle point
  • Load
  • Distance

Question 23

Question
What is the relationship between force, mass and acceleration?
Answer
  • f = ma
  • f = m/a
  • f = m - a
  • f = m + a

Question 24

Question
What is the work done when a force of 30N move an object 10m
Answer
  • 200 metres
  • 300 Horse power
  • 300 Watts
  • 300 Joules

Question 25

Question
What is the gravitational pull on earth
Answer

Question 26

Question
The force of gravity on earth is considered to be
Answer

Question 27

Question
A load of 50Kg has a force of 25N applied what is the acceleration of the load
Answer
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