Inglés unidad 4

The device used for measuring energy is called. Multimeter. Wattmeter. Ohmmeter. Energy meter.

The power factor of an installation can be determined by using: A voltmeter and an ammeter. A wattmeter. A power meter. A phase meter.

A wattmeter has been placed between phases 1 and 2 of a 3-phase balanced system. The value of electric powerin this installation will be. 3 times the power measure displayed by the wattmeter. 2 times the power given by the wattmeter. Two more measures are needed to calculate power. A varmeter would be needed for measuring power in a 3-phase system.

A wattmeter measures, in AC systems,. Apparent power. Reactive power. Active power. None.

The resistance of a multimeter when measuring electric currents will be: As high as possible, so as not to distort the measurement. As low as possible, so as not to distort the measurement. A multimeter has no internal resistance.

The measurement of electric current is done with: A wattmeter. A voltmeter. An ohmmeter. An ammeter.

Voltage (electric potential) is measured : By series connecting the multimeter and the load. By series connecting the ammeter to the load. By connecting the multimeter in parallel to the load. Electric potential cannot be measured.

The resistance featured by a multimeter when measuring voltage will be: As high as possible, so as not to distort the measurement. As low as possible, so as not to distort the measurement. A multimeter has no internal resistance.

A clamp meter can be used for: Measuring weak alternate current magnitudes. Measuring weak direct current magnitudes. Measuring high alternate current magnitudes. None.

When a conductor’s continuity needs to be known…: An ammeter can be used to check that current goes through the conductor. A voltmeter can be used to check that there is potential difference between both ends. An ohmmeter can be used to measure the resistance between both ends of the conductor. A multimeter can be used in the “Continuity” mode.

The mean value of a sinusoidal wave with maximum value of 15V is: 7,5 V. 10,6V. 9,5 V. 8V.

A multimeter can be used for measuring: Just voltage. Just current. Several electric variables. All.

The efficient value of a sinusoidal wave with maximum value of 10V is: 10V. 14,14V. 7,07V. 6,36V.

According to the REBT, specifically to the ITC-BT 03, some of the technical means utilised by the authorisedinstallers of the basic category are: Networks, harmonics and network disturbances analyser. Tester of operating theatre watchers and AC 3-phase power-energy analyser-recorder. Earth resistance meter, isolation meter and multimeter. Lux meter, ground isolation measuring electrodes and multimeter.

An oscilloscope has shown that the period of a sinusoidal wave amounts to 10 ms. The frequency of this wave willbe: 0,1 Hz. 10Hz. 100Hz. 1000Hz.

The tester of differential breaker trigger sensitivity…. Is not required for an authorised installer. Is only required for authorised installers of the specialist category. Is only required for authorised installers of the basic category. Is required for any authorised installer.

In order to measure electric currents, the device must be connected: In series with the load. In parallel with the load. Electric currents can only be measured with clamp meters.

The unit of measurement of power is: KW/h. W/s. Watt. Joule.

The representation of a magnitude will depend upon: That this magnitude is analogical. That this magnitude is digital. The type of device utilised. None.

The measurement of power can be done with a: Wattmeter. Voltmeter and ohmmeter. Voltmeter and ammeter. Both a and c are correct.