Test
Principles of basic mechanics
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Preguntas del test (27)
1The work needed to raise a load of 95kg to a height of 30 m is approximately
- A28 J
- B2.79 kJ
- C28 kJ
- D285 J
2The pivot point of a lever is called
- Acentre
- Bpulley
- CLoad
- Dfulcrum
3Calculate the MASS of the LOAD required to balance the EFFORT applied shown below.
- A824.6kg
- B1160.1kg
- C118.3kg
- D266.2kg
4A motor has an input power of 3 kW and is 85 % efficient. What is the output power?
- A2.55 kW
- B3 kW
- C3.53 kW
- D2.4 kW
5If an object has a mass of 50 Kg on earth, in space its mass would be
- A100 kg
- B490 kg
- C50 kg
- D41 kg
6What is the power of a hoist required to lift an object of 20 kg, 20 m in 30 seconds.
- A3.3kW
- B1.3kW
- C13.3W
- D130.8W
7Pliers rely on which principle for their operation
- Aleverage
- Btension
- Ctorsion
- Dfriction
8A motor has an input power of 50kW and an output power of 47kW. What is the efficiency of the motor?
- A100 %
- B86 %
- C96 %
- D94 %
9A motor has an output power of 40kW and an efficiency of 80%. What is the input power of the motor?
- A32 kW
- B50 kW
- C40 kW
- D54 kW
10The power input to a machine is 90 W and the output power is 60 W the efficiency of the machine is
- A86 %
- B66.6 %
- C75 %
- D80 %
- A86 %
11The weight of an object is the
- Amass of the object divided by 9.81
- Bthe same as the mass when there is gravity
- Cforce acting on top of the object due to gravity
- Dforce acting directly below the object due to gravity
12A mass of 9.5 Kg exerts a force on earth of
- A9.3 N
- B95 N
- C9.5 N
- D93.2 N
13What is the power of a motor required to lift a load of mass 300kg 40m in 2 minutes.
- A981 W
- B6000 W
- C98.1 W
- D100 W
14Calculate the distance D required to balance the effort and load shown
- A5.64m
- B6.65m
- C4.54m
- D6.45m
15A motor has an output power of 40kW and an efficiency of 66.66%. What is the input power of the motor?
- A30 kW
- B60 kW
- C50 kW
- D70 kW
16A 2kW heater is 90% efficient. The input power to the heater is
- A5kW
- B1.88kW
- C3kW
- D2.22kW
17A mass of 30kg would have an weight of
- A0.327N
- B3.05kN
- C3.05N
- D294.3N
18A motor has an efficiency of 73%. If the input power is 32kW, the output power available is
- A76.64kW
- B23.36kW
- C22.8kW
- D32kW
19Calculate the work done when required to raise a load of 1000kg through a vertical distance of 20m.
- A19620J
- B20000J
- C200000J
- D196200J
20A force of 50kN moves an object a distance of 2m. The work done is.
- A25kJ
- B50kJ
- C100kJ
- D200kJ
21From the following diagram identify the Mass
- A2.5kg
- B10kg
- C5kg
- D30kg
22From the following diagram what is the arrow pointing to
- AFulcrum
- Bmiddle point
- CLoad
- DDistance
23What is the relationship between force, mass and acceleration?
- Af = ma
- Bf = m/a
- Cf = m - a
- Df = m + a
24What is the work done when a force of 30N move an object 10m
- A200 metres
- B300 Horse power
- C300 Watts
- D300 Joules
25What is the gravitational pull on earth
- A
- B
- C
- D
- A
26The force of gravity on earth is considered to be
- A
- B
- C
- D
- A
27A load of 50Kg has a force of 25N applied what is the acceleration of the load
- A
- B
- C
- D
- A
Información
- Descripción
- 2 Electrical Science Test sobre Principles of basic mechanics, creado por Vito Martino el 12/05/2014.
- Autor
- Vito Martino
- Idioma
- English
- Visitas
- 786
- Historial
- Creado el 12 may 2014 · actualizado el 2 feb 2017
- Etiquetas
- Valoración
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