Unit 36 Mock Exam

1

An inductor of 300mH placed on a 60Hz network will have an inductive reactance of?

1

A capacitor of 90µF is placed on an electrical network of frequency 65 Hz. What is the value of capacitive reactance?

1

What is the typical generation voltage at a power station?

1

Where is the neutral connected on the secondary of a delta to star transformer?

1

What is the phase separation angle in a typical star system between phases?

1

A voltage of 700V is applied to two resistors in series. A current of 2.8A flows. If one of the resistors is 150Ω what is the value of the other?

1

What is the series impedance of a circuit where the resistance is 30Ω the inductive reactance is 70Ω and the capacitive reactance is 30Ω?

1

If you have a star phase voltage of 135V what would the line voltage be?

1

A 30kW lift motor is running at 0.95 power factor. Calculate the line current that is drawn from the supply when the voltage is 390V:

1

What type of light fitting requires no control gear?

1

Which type of protective device natively offers the functions of earth fault, residual current and short circuit protection?

1

A light source of 300 Candela is placed 2.5m above a table. Calculate the illuminance at a point directly below the light fitting.

1

The full load current of a transformer is 650A and the voltage is 400V between phases. Calculate the apparent power rating of the transformer.

1

In a TT system the means of earthing is provided by:

1

The phase voltage supplied to a building is 270V. The building is given a 3 phase 3 wire supply. What voltage are available to work with?

1

Calculate the angle the current lags the voltage in a network where there is 30kW and 12kVAr on the network.

1

A centre tapped to earth transformer has a voltage of 75V phase to earth. What would the full voltage available be?

1

A 25kW load is being drawn from a supply at 350V. Calculate the power loss through the conductor if the resistance is measured at 0.3Ω.

1

The potential difference between a cat and the earth is 1000V. If the resistance of the cat is measured at 250Ω what would the current flow to earth be?

unknown JTL Unit 36 and 38 Revision Test sobre Unit 36 Mock Exam, creado por giannini.chambers el 22/04/2015.

Unit 36 Mock Exam

An inductor of 300mH placed on a 60Hz network will have an inductive reactance of?

A capacitor of 90µF is placed on an electrical network of frequency 65 Hz. What is the value of capacitive reactance?

What is the typical generation voltage at a power station?

Where is the neutral connected on the secondary of a delta to star transformer?

What is the phase separation angle in a typical star system between phases?

A voltage of 700V is applied to two resistors in series. A current of 2.8A flows. If one of the resistors is 150Ω what is the value of the other?

What is the series impedance of a circuit where the resistance is 30Ω the inductive reactance is 70Ω and the capacitive reactance is 30Ω?

If you have a star phase voltage of 135V what would the line voltage be?

A 30kW lift motor is running at 0.95 power factor. Calculate the line current that is drawn from the supply when the voltage is 390V:

What type of light fitting requires no control gear?

Which type of protective device natively offers the functions of earth fault, residual current and short circuit protection?

A light source of 300 Candela is placed 2.5m above a table. Calculate the illuminance at a point directly below the light fitting.

The full load current of a transformer is 650A and the voltage is 400V between phases. Calculate the apparent power rating of the transformer.

In a TT system the means of earthing is provided by:

The phase voltage supplied to a building is 270V. The building is given a 3 phase 3 wire supply. What voltage are available to work with?

Calculate the angle the current lags the voltage in a network where there is 30kW and 12kVAr on the network.

A centre tapped to earth transformer has a voltage of 75V phase to earth. What would the full voltage available be?

A 25kW load is being drawn from a supply at 350V. Calculate the power loss through the conductor if the resistance is measured at 0.3Ω.

The potential difference between a cat and the earth is 1000V. If the resistance of the cat is measured at 250Ω what would the current flow to earth be?