Displaying 31 to 40 of 192 Questions. You are on Page No. 4 of total 20 pages
Question: The input used by an antenna or cable to a TV set uses frequencies called...?
Correct Answer RF is radio frequency. IF is intermediate frequency used inside the TV for processing. AF is audio frequency. SAP is second audio program which may have another language or other soundtrack as an option to the main soundtrack.
Question: The transformer that develops the high voltage in a home television is commonly called a...?
Correct Answer The flyback is usually connected to the system that pulls the electron beam across the screen in one direction to 'paint' a line of the image and then returns in the other direction much faster.
Question: Most modern TV's draw power even if turned off. The circuit the power is used in does what function?
Correct Answer Some authorities are recommending TV's, VCR's and Stereo's be connected to power strips with switches and turned off when not in use to save energy. Your remote will not work until power is switched back on.
Question: In a color television set using a picture tube a high voltage is used to accelerate electron beams to light the screen. That voltage is about...?
Correct Answer This voltage often remains in storage even if the set is unplugged. Although the voltage is very high it has very low power but it can be dangerous because your body jumps if brought in contact.
Question: In the United States the television broadcast standard is...?
Correct Answer PAL and SECAM are standards used in other countries. RGB stands for red, green, and blue - the colors of light used to create an image in a color tv set and is often used as a format name for computer monitors.
Question: Which is NOT an acceptable method of distributing small power outlets throughout an open plan office area?
Correct Answer Extension cords can be a tripping hazard, and can be easily damaged, causing an unsafe situation. There are many ways of safely getting power to each work place, where wiring is protected and concealed.
Question: In the UK, what type of installation requires a fireman's switch?
Correct Answer Neon lighting runs at a high voltage, typically above 1000 Volts. A fireman's switch protects a fireman from receiving a shock when a water jet is sprayed onto the installation. The switches are red, and mounted in a conspicuous position. (This is specified by IEE Regulations (Europe), SANS (South Africa), UK Electricity regulations and many Asian countries. I am unable to confirm other countries' requirements, so feel free to let me know.)
Question: What will a UPS be used for in a building?
Correct Answer UPS stands for Uninterruptible Power Supply. Examples of equipment that may require a UPS supply are computers, fire detection systems, hospital operating theatre equipment and escape route lighting.
Question: Larger buildings may be supplied with a medium voltage electricity supply, and will required a substation or mini-sub. What is the main item of equipment contained in these?
Correct Answer The transformer is used to transform a medium voltage supply to a low voltage supply, e.g. from 11 000 V to 400 V. A transformer is rated in kVA, kilo-Volt-Amps, which is a measurement of electrical power.