863069
Descripción
Test por Vito Martino, actualizado hace más de 1 año
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Creado por Vito Martino
hace más de 10 años
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Pregunta 1
Pregunta
The work needed to raise a load of 95kg to a height of 30 m is approximately
Respuesta
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28 J
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2.79 kJ
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28 kJ
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285 J
Pregunta 2
Pregunta
The pivot point of a lever is called
Respuesta
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centre
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pulley
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Load
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fulcrum
Pregunta 3
Pregunta
Calculate the MASS of the LOAD required to balance the EFFORT applied shown below.
Image:
Slide1.JPG (image/JPG)
Respuesta
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824.6kg
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1160.1kg
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118.3kg
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266.2kg
Pregunta 4
Pregunta
A motor has an input power of 3 kW and is 85 % efficient. What is the output power?
Respuesta
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2.55 kW
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3 kW
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3.53 kW
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2.4 kW
Pregunta 5
Pregunta
If an object has a mass of 50 Kg on earth, in space its mass would be
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100 kg
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490 kg
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50 kg
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41 kg
Pregunta 6
Pregunta
What is the power of a hoist required to lift an object of 20 kg, 20 m in 30 seconds.
Respuesta
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3.3kW
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1.3kW
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13.3W
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130.8W
Pregunta 7
Pregunta
Pliers rely on which principle for their operation
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leverage
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tension
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torsion
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friction
Pregunta 8
Pregunta
A motor has an input power of 50kW and an output power of 47kW. What is the efficiency of the motor?
Respuesta
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100 %
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86 %
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96 %
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94 %
Pregunta 9
Pregunta
A motor has an output power of 40kW and an efficiency of 80%. What is the input power of the motor?
Respuesta
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32 kW
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50 kW
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40 kW
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54 kW
Pregunta 10
Pregunta
The power input to a machine is 90 W and the output power is 60 W the efficiency of the machine is
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86 %
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66.6 %
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75 %
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80 %
Pregunta 11
Pregunta
The weight of an object is the
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mass of the object divided by 9.81
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the same as the mass when there is gravity
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force acting on top of the object due to gravity
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force acting directly below the object due to gravity
Pregunta 12
Pregunta
A mass of 9.5 Kg exerts a force on earth of
Respuesta
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9.3 N
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95 N
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9.5 N
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93.2 N
Pregunta 13
Pregunta
What is the power of a motor required to lift a load of mass 300kg 40m in 2 minutes.
Respuesta
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981 W
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6000 W
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98.1 W
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100 W
Pregunta 14
Pregunta
Calculate the distance D required to balance the effort and load shown
Image:
Slide2.JPG (image/JPG)
Respuesta
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5.64m
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6.65m
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4.54m
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6.45m
Pregunta 15
Pregunta
A motor has an output power of 40kW and an efficiency of 66.66%. What is the input power of the motor?
Respuesta
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30 kW
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60 kW
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50 kW
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70 kW
Pregunta 16
Pregunta
A 2kW heater is 90% efficient. The input power to the heater is
Respuesta
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5kW
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1.88kW
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3kW
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2.22kW
Pregunta 17
Pregunta
A mass of 30kg would have an weight of
Respuesta
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0.327N
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3.05kN
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3.05N
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294.3N
Pregunta 18
Pregunta
A motor has an efficiency of 73%. If the input power is 32kW, the output power available is
Respuesta
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76.64kW
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23.36kW
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22.8kW
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32kW
Pregunta 19
Pregunta
Calculate the work done when required to raise a load of 1000kg through a vertical distance of 20m.
Respuesta
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19620J
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20000J
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200000J
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196200J
Pregunta 20
Pregunta
A force of 50kN moves an object a distance of 2m. The work done is.
Respuesta
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25kJ
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50kJ
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100kJ
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200kJ
Pregunta 21
Respuesta
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2.5kg
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10kg
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5kg
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30kg
Pregunta 22
Respuesta
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Fulcrum
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middle point
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Load
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Distance
Pregunta 23
Pregunta
What is the relationship between force, mass and acceleration?
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f = ma
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f = m/a
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f = m - a
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f = m + a
Pregunta 24
Pregunta
What is the work done when a force of 30N move an object 10m
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200 metres
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300 Horse power
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300 Watts
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300 Joules
Pregunta 25
Pregunta
What is the gravitational pull on earth
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Image:Slide1.JPG (image/JPG)
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Image:Slide2.JPG (image/JPG)
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Image:Slide3.JPG (image/JPG)
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Image:Slide4.JPG (image/JPG)
Pregunta 26
Pregunta
The force of gravity on earth is considered to be
Respuesta
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Image:Slide1.JPG (image/JPG)
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Image:Slide2.JPG (image/JPG)
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Image:Slide3.JPG (image/JPG)
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Image:Slide4.JPG (image/JPG)
Pregunta 27
Pregunta
A load of 50Kg has a force of 25N applied what is the acceleration of the load
Respuesta
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Image:Slide1.JPG (image/JPG)
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Image:Slide2.JPG (image/JPG)
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Image:Slide3.JPG (image/JPG)
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Image:Slide4.JPG (image/JPG)
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