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Principles of basic electrical circuits

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2 Electrical Science Test sobre Principles of basic electrical circuits, creado por Vito Martino el 09/05/2014.
Vito Martino
Test por Vito Martino, actualizado hace más de 1 año
Vito Martino
Creado por Vito Martino hace casi 10 años
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Resumen del Recurso

Pregunta 1

Pregunta
Look at the following question
Image:
Resistivity_Q1 (image/jpg)
Respuesta
  • 0.356 Ω
  • 0.536 Ω
  • 0.178 Ω
  • 0.235 Ω

Pregunta 2

Pregunta
Answer the following question
Image:
Slide1.JPG (image/JPG)
Respuesta
  • 50 m
  • 25 m
  • 30 m
  • 40 m

Pregunta 3

Pregunta
Answer the following questions
Image:
Slide2.JPG (image/JPG)
Respuesta
  • 0.065 Ω
  • 0.552 Ω
  • 0.045 Ω
  • 0.055 Ω

Pregunta 4

Pregunta
Which of the following formulas can calculate power in a resistive circuit
Respuesta

Pregunta 5

Pregunta
3 x 12Ω resistors are connected in parallel to a 200V supply, calculate the total power of the circuit.
Respuesta
  • 10,000W
  • 400W
  • 1,000W
  • 1,111W

Pregunta 6

Pregunta
Two resistors of 20 ohms and 40 ohms are connected in series across a 120v d.c. supply, the current flowing in the circuit will be:
Respuesta
  • 20 A
  • 2 A
  • 5 A
  • 0.5 A

Pregunta 7

Pregunta
If three resistors are connected in series and have resistances of 20 Ω, 30 Ω, and 40 Ω then the total resistance would be
Respuesta
  • 100 Ω
  • 90 Ω
  • 70 Ω
  • 80 Ω

Pregunta 8

Pregunta
3 x 20Ω resistors are connected in series to a 200V supply, calculate the total power of the circuit.
Respuesta
  • 10 KW
  • 0.666 KW
  • 0.333 KW
  • 12 KW

Pregunta 9

Pregunta
For the circuit shown the total resistance is
Image:
Series_circuit_1 (image/jpg)
Respuesta
  • 10 Ω
  • 15 Ω
  • 100 Ω
  • 90 Ω

Pregunta 10

Pregunta
To measure the current through a load the meter must be connected
Respuesta
  • across the load
  • in parallel with the supply
  • in parallel with the load
  • In series with the load

Pregunta 11

Pregunta
To measure the voltage across a load the meter must be connected
Respuesta
  • before the load
  • in parallel with the supply
  • in parallel with the load
  • In series with the load

Pregunta 12

Pregunta
In the diagram below if I1 and I2 are ammeter readings then
Image:
Series_circuit_2 (image/jpg)
Respuesta
  • I2 will be greater than I1
  • I1 will be greater than I2
  • I1 will be equal to I2
  • I1 will be half I2

Pregunta 13

Pregunta
In the diagram below instrument A measures
Image:
Slide1.JPG (image/JPG)
Respuesta
  • the current through R3
  • the current through R1 and R2
  • the volt drop across R1 and R2
  • the volt drop across R1 and R3

Pregunta 14

Pregunta
In the diagram below instrument B measures
Image:
Slide1.JPG (image/JPG)
Respuesta
  • the current through R3
  • the current through R1
  • the volt drop across R1 and R2
  • the volt drop across R1

Pregunta 15

Pregunta
Instrument A measures
Image:
Slide2.JPG (image/JPG)
Respuesta
  • current through a resistor
  • supply current
  • Voltage across a resistor
  • supply voltage

Pregunta 16

Pregunta
Instrument E measures
Image:
Slide2.JPG (image/JPG)
Respuesta
  • current through a resistor
  • supply current
  • Voltage across a resistor
  • supply voltage

Pregunta 17

Pregunta
For the circuit shown above the total current is
Image:
Series_circuit_1 (image/jpg)
Respuesta
  • 0.1A
  • 10A
  • 20A
  • 1.1A

Pregunta 18

Pregunta
If four resistors each of 50 Ω are connected in parallel the overall resistance is
Respuesta
  • 25 Ω
  • 100 Ω
  • 12.5 Ω
  • 200 Ω

Pregunta 19

Pregunta
Which of the instrument numbers would measure current
Image:
Slide3.JPG (image/JPG)
Respuesta
  • none of them
  • 1 and 3
  • 2 and 3
  • 1

Pregunta 20

Pregunta
Which of the instrument numbers would measure voltage
Image:
Slide3.JPG (image/JPG)
Respuesta
  • none of them
  • 3
  • 2
  • 1

Pregunta 21

Pregunta
When current flows in a conductor, a magnetic field is created around the conductor
Respuesta
  • when the voltage is high enough
  • only if it is a coil
  • as long as the current flows
  • only when d.c is applied

Pregunta 22

Pregunta
Meter M1 will measure
Image:
Slide4.JPG (image/JPG)
Respuesta
  • the supply current
  • the current through R1
  • the volt drop across R1 and R2
  • the volt drop across R1

Pregunta 23

Pregunta
Meter M2 will measure
Image:
Slide4.JPG (image/JPG)
Respuesta
  • the supply current
  • the current through R1
  • the volt drop across R2 and R3
  • the supply voltage

Pregunta 24

Pregunta
Instrument 4 is measuring
Image:
Instrument_question (image/jpg)
Respuesta
  • the supply current
  • the current through the resistor
  • the supply voltage
  • the voltage across the resistor

Pregunta 25

Pregunta
Instrument 2 above is measuring
Image:
Instrument_question (image/jpg)
Respuesta
  • the supply current
  • the current through the resistor
  • the supply voltage
  • the voltage across the resistor

Pregunta 26

Pregunta
Of the following materials which would be the BEST conductor of electricity?
Respuesta
  • Nichrome
  • Steel
  • Aluminium
  • Copper

Pregunta 27

Pregunta
A poor conductor of electricity is:
Respuesta
  • Glass
  • Copper
  • Aluminium
  • Silver

Pregunta 28

Pregunta
The resistance of an electrical conductor is:
Respuesta
  • Affected by the weather
  • Determined by the formula I = P x V
  • Inversely proportional to length and proportional to c.s.a
  • Proportional to the length and inversely proportional to the c.s.a

Pregunta 29

Pregunta
What is the formula for two resistors in parallel?
Respuesta
  • R1 + R2/R1 - R2
  • R1 - R2/R1 x R2
  • R1 + R2/R1 x R2
  • R1 x R2/R1 + R2

Pregunta 30

Pregunta
When the current through a conductor increases
Respuesta
  • the voltage decreases
  • the temperature decreases
  • the temperature increases
  • the resistance decreases

Pregunta 31

Pregunta
The current in a circuit is 100A and the resistance is 0.1 Ohm. The supply voltage is
Respuesta
  • 14V
  • 20V
  • 12V
  • 10V

Pregunta 32

Pregunta
The equation for current flowing in a resistive circuit is
Respuesta
  • I = R/P
  • I = R/V
  • I = P/R
  • I = V/R

Pregunta 33

Pregunta
The total resistance of two resistors of 20 Ohms and 35 Ohms connected in series is
Respuesta
  • 50 Ohms
  • 45 Ohms
  • 15 Ohms
  • 55 Ohms

Pregunta 34

Pregunta
When an electric current flows through a conductor it
Respuesta
  • Cools down and expands
  • Cools down and contracts
  • Heats up and contracts
  • Heats up and expands
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