CBSE Class-12 Exam 2017 : All India Scheme

Operation And Maintenance Of Communication Devices

संचार उपकरणों का संचालन और रखरखाव

OPERATION AND MAINTENANCE OF
COMMUNICATION DEVICES

किन्हीं तेरह प्रश्नों के उत्तर दीजिए । प्रत्येक प्रश्न के लिए एक अंक है । सही उत्तर चुनिए ।

Attempt any thirteen questions. Each question carries one mark. Select the correct answer.

खण्ड अ
SECTION A

१. विद्युत्-चुम्बकीय तरंगें किन आवृत्तियों पर ‘स्पेस वेवङ्क द्वारा आगे ब‹ढती हैं ?
(१) निम्न आर.एफ.
(२) मध्यम आर.एफ.
(३) उच्च आर.एफ.
(४) वी.एच.एफ.

Electromagnetic wave propagation through space wave takes place at
(1) Low RF
(2) Medium RF
(3) High RF
(4) VHF

२. किसी इलेक्ट्रॉनिक सिग्नल में १ kHz से २५ kHz तक की आवृत्तियाँ होती हैं । इसकी बैंड चौ‹डाई कितनी है ?
(१) २६ kHz
(२) २१ kHz
(३) २५०० Hz
(४) २४ kHz

An electronic signal comprises of frequencies from 1 kHz to 25 kHz. What is its bandwidth ?
(1) 26 kHz
(2) 21 kHz
(3) 2500 Hz
(4) 24 kHz

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Courtesy: CBSE

CBSE Board Class-XII

सीबीएसई बोर्ड कक्षा-12

Papers

Class-12

CBSE 2017-18 Syllabus Class-12 : Engineering Graphics

Posted: 07 Aug 2017 11:45 PM PDT

CBSE-CLASS-XII-LOGO

CBSE Class-12 Syllabus 2017-18

Subject: Engineering Graphics

The subject of 'Engineering Graphics' has become an indispensable tool for Engineers, Technocrats, Architects, Draftsmen, Surveyors, Designers and many other professionals in the recent times. Understanding of its fundamental principles and wider applications of the same in the above fields and many other daily life situations form the basis for the syllabus at Senior Secondary Stage.

1. Objectives:

The study of the subject of Engineering Graphics at Senior School Level aims at helping the learner to:
develop clear concept and perception of form, proportion and application.
develop the skill of expressing three-dimensional and two-dimensional objects into professional language and vice versa.
acquire the ability to readily draw neat sketches, often needed in "On -job situations".
develop a clear understanding of plane and solid Geometry and machine drawing so as to apply the same in relevant practical fields such as technology and industry.
acquire speed and accuracy in use of drawing instruments.
use technology (CAD) in developing isometric and orthographic projections of simple objects.