 # Principles of basic mechanics

Quiz by , created over 5 years ago

## 2 Electrical Science Quiz on Principles of basic mechanics, created by brightsparky79 on 05/12/2014. 675 1 0 No tags specified Created by brightsparky79 over 5 years ago
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### Question 1

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

### Question 2

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

### Question 3

Question
Calculate the MASS of the LOAD required to balance the EFFORT applied shown below.
• 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?
• 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
• 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.
• 3.3kW
• 1.3kW
• 13.3W
• 130.8W

### Question 7

Question
Pliers rely on which principle for their operation
• 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?
• 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?
• 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
• 86 %
• 66.6 %
• 75 %
• 80 %

### Question 11

Question
The weight of an object is the
• 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
• 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.
• 981 W
• 6000 W
• 98.1 W
• 100 W

### Question 14

Question
Calculate the distance D required to balance the effort and load shown
• 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?
• 30 kW
• 60 kW
• 50 kW
• 70 kW

### Question 16

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

### Question 17

Question
A mass of 30kg would have an weight of
• 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
• 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.
• 19620J
• 20000J
• 200000J
• 196200J

### Question 20

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

### Question 21

Question
From the following diagram identify the Mass
• 2.5kg
• 10kg
• 5kg
• 30kg

### Question 22

Question
From the following diagram what is the arrow pointing to
• Fulcrum
• middle point
• Distance

### Question 23

Question
What is the relationship between force, mass and acceleration?
• 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
• 200 metres
• 300 Horse power
• 300 Watts
• 300 Joules

### Question 25

Question
What is the gravitational pull on earth