Test
2_Principles of basic electrical circuits
Este test tiene tiempo límite, así que se abre en el reproductor de siempre.
Preguntas del test (25)
13 x 12Ω resistors are connected in parallel to a 200V supply, calculate the total power of the circuit.
- A10,000W
- B400W
- C1,000W
- D1,111W
2Two 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:
- A20 A
- B2 A
- C5 A
- D0.5 A
3If three resistors are connected in series and have resistances of 20 Ω, 30 Ω, and 40 Ω then the total resistance would be
- A100 Ω
- B90 Ω
- C70 Ω
- D80 Ω
43 x 20Ω resistors are connected in series to a 200V supply, calculate the total power of the circuit.
- A10 KW
- B0.666 KW
- C0.333 KW
- D12 KW
5For the circuit shown the total resistance is
- A10 Ω
- B15 Ω
- C100 Ω
- D90 Ω
6To measure the current through a load the meter must be connected
- Aacross the load
- Bin parallel with the supply
- Cin parallel with the load
- DIn series with the load
7To measure the voltage across a load the meter must be connected
- Abefore the load
- Bin parallel with the supply
- Cin parallel with the load
- DIn series with the load
8In the diagram below if I1 and I2 are ammeter readings then
- AI2 will be greater than I1
- BI1 will be greater than I2
- CI1 will be equal to I2
- DI1 will be half I2
9In the diagram below instrument A measures
- Athe current through R3
- Bthe current through R1 and R2
- Cthe volt drop across R1 and R2
- Dthe volt drop across R1 and R3
10In the diagram below instrument B measures
- Athe current through R3
- Bthe current through R1
- Cthe volt drop across R1 and R2
- Dthe volt drop across R1
11Instrument A measures
- Acurrent through a resistor
- Bsupply current
- CVoltage across a resistor
- Dsupply voltage
12Instrument E measures
- Acurrent through a resistor
- Bsupply current
- CVoltage across a resistor
- Dsupply voltage
13For the circuit shown above the total current is
- A0.1A
- B10A
- C20A
- D1.1A
14If four resistors each of 50 Ω are connected in parallel the overall resistance is
- A25 Ω
- B100 Ω
- C12.5 Ω
- D200 Ω
15Which of the instrument numbers would measure current
- Anone of them
- B1 and 3
- C2 and 3
- D1
16Which of the instrument numbers would measure voltage
- Anone of them
- B3
- C2
- D1
17Meter M1 will measure
- Athe supply current
- Bthe current through R1
- Cthe volt drop across R1 and R2
- Dthe volt drop across R1
18Meter M2 will measure
- Athe supply current
- Bthe current through R1
- Cthe volt drop across R2 and R3
- Dthe supply voltage
19Instrument 4 is measuring
- Athe supply current
- Bthe current through the resistor
- Cthe supply voltage
- Dthe voltage across the resistor
20Instrument 2 above is measuring
- Athe supply current
- Bthe current through the resistor
- Cthe supply voltage
- Dthe voltage across the resistor
21Of the following materials which would be the BEST conductor of electricity?
- ANichrome
- BSteel
- CAluminium
- DCopper
22A poor conductor of electricity is:
- AGlass
- BCopper
- CAluminium
- DSilver
23The resistance of an electrical conductor is:
- AAffected by the weather
- BDetermined by the formula I = P x V
- CInversely proportional to length and proportional to c.s.a
- DProportional to the length and inversely proportional to the c.s.a
24What is the formula for two resistors in parallel?
- AR1 + R2/R1 - R2
- BR1 - R2/R1 x R2
- CR1 + R2/R1 x R2
- DR1 x R2/R1 + R2
25When the current through a conductor increases
- Athe voltage decreases
- Bthe temperature decreases
- Cthe temperature increases
- Dthe resistance decreases
Información
- Descripción
- level 1
- Autor
- r.t.mathews
- Idioma
- English
- Visitas
- 70
- Etiquetas
- Valoración
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