A photostat machine works on – (1) electromagnetic image making (2) electrostatic image making (3) magnetic image making (4) thermal image making

A photostat machine works on – (1) electromagnetic image making (2) electrostatic image making (3) magnetic image making (4) thermal image making
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(2) electrostatic image making Explanation: A photocopier uses electrostatic charge to produce a copy. The original document is placed onto a sheet of glass. An image of this page is projected onto a positively charged drum. The drum has a coating which conducts electricity when light falls on it. The parts of the drum which are lit by the projected image lose their electrostatic charge when they start to conduct.
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Description : The basic operating principle of a transformer is attributed to ______________. A. electromagnetic induction B. variance of a conductor in a magnetic field C. mutual reaction D. thermionic emission

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An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a ____________. A. magnetic amplifier B. ship's service alternator C. three-wire DC generator D. saturable core reactor

Description : An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a ____________. A. magnetic amplifier B. ship's service alternator C. three-wire DC generator D. saturable core reactor

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