group a exam guide october21-2011

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MAINTENANCE TECHNOLOGISTENTRANCE EXAM

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CANDIDATES USER GUIDE

BTEC2004E

Revision2004-12-06(Revision October 2011)


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Maintenance Technologist Entrance Exam Candidates Users Guide

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Maintenance Technologist Entrance Exam

Group A

Candidates Users Guide

INTRODUCTION

This document is intended to familiarize the candidates with the hiring process and the

entrance examfor the position of maintenance technician at the CBC.

This process requires that the candidates meet the qualification prerequisites identified in

the job posting. A copy of the job spec is available from CBCs Human Resources

department. In addition to these requirements the candidate must:

Have a high school diploma plus two years of technical school or the equivalentexperience as recognized by the CBC and

Write and pass an entrance exam designed to confirm their technical knowledgeas it relates to the job of a maintenance technician. They may also have to write

and pass a practical exam if stipulated in the job posting.

After having met these conditions and following a review of their resume, the candidate

may be invited to participate in a job interview. The interview will also give anopportunity to the candidate to ask questions relating to the prospective position.

THE ENTRANCE EXAM

Part 1: Knowledge exam

The entrance knowledge exam contains 50 multiple-choice questions that are closely tiedto the published job specs. The required pass-mark is 60%. The exam duration is 3.5

hours.

A typical exam might comprise exam questions distributed among the knowledge areas

as follows:

Application of Ohms law 5 questions

Circuit analysisDiscrete components 10 questions Circuit analysisIntegrated circuits 10 questions Power supplies 5 questions Measurement techniques 5 questions Digital logic circuits 5 questions Computers 10 questions

Total: 50 questions


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Part 2: Specialty exam

To gain some appreciation of a candidates work experience, 30 supplementary questionsare included in the test. These deal with work specialties in 3 main areas:

Audio 10 questions Television 10 questions Transmitters 10 questionsTotal: 30 questions

Normally these specialty questions do not count towards the final mark. However, ininstances where the candidate fails but gets more than 52% on the general knowledge

exam then, at the discretion of the manager, the candidates score on their related

specialty questions (Audio, TV or Transmitters) can be included. If the combined mark(general knowledge & specialty) is 60% or greater then the candidate will be given a

pass.

The exam will be conducted online at a CBC location. A computer and a scientificcalculator will be provided at that time. The candidate will be allowed to bring one letter-

sized sheet of paper containing whatever notes and/or formulae he or she chooses. This

paper will be submitted along with the completed exam.

How can you prepare for the exam?

To give some familiarity with the type of questions used, we have provided one samplequestion from each of the categories. These questions are found in the appendix. The

answer to each of the questions can be found at the end of the appendix

The candidate may wish to review some or all of the material that he/she can expect to

find in the exam. Many reference books are available in libraries and book stores that

cover the required material. The following references will provide a good starting point.

Please note that newer editions may be available:

1- Introductory Circuit Analysis (12th Edition, 2010)By Robert L. Boylstad;

Charles E. Merrill Publishing Division of Bell and Howell Company

2- Electronic Principles (6th Edition, 1998)By Albert Paul Malvino;McGraw Hill Book Company

3- Basic TV Technology: Digital and Analog (4th Edition, 2005)By Robert L. Hartwig;Focal Press


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Appendix

Sample Questions


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1. APPLICATION OF OHMS LAW

Calculate the current through Rs

Answers:

a) 14.7 mAb) 29.4 mAc) IRS depends on the value of RL and the hFE of the transistord) 0 mA, because the Zener is the wrong polarity


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2. CIRCUIT ANALYSISDISCRETE COMPONENTS

In the following circuit what DC voltage is present at the Ve point with respect to

ground?

Note: Silicon transistor

Answers:

a) 2.6 Vb) -3.3 Vc) 16.6 Vd) 16.0 V


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3. CIRCUIT ANALYSIS - INTEGRATED CIRCUITS

If 0.5 Volts is applied at the input of the above circuit, what is the value of the output

voltage? Assume +VCC = +15V andVCC = -15V.

Answers:

a) 0.833 Vb) 6 Vc) 15 Vd) 1.2 V


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4. POWER SUPPLIES

In this DC-DC converter what would be the effect if V1 or V2 is short-circuited

(Transformer is Toroidal)

Answers:

a) The circuit would stop oscillating and only restart when the short is removedb) One of the two power transistors would be destroyedc) The rectifying diodes would be destroyedd) Both the power transistors would blow


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5. MEASUREMENT TECHNIQUES

A two-channel oscilloscope provides two sweep modes (alternate and chop). When one

looks at two signals in the range of 20 Hz to 2 kHz, it is better to use the chop mode

because it permits both signals to be observed:

Answers:

a) Simultaneouslyb) With more brightnessc) With more measurement accuracyd) By minimizing focal error


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6. DIGITAL CIRCUITS(LOGIC)

Which of the circuits below corresponds to the equation:

Answers:

a) Circuit A

b) Circuit B

c) Circuit C

d) Circuit D


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7. COMPUTERS

A network interface card (NIC) is set up so that it cannot send and receive data at the

same time. How would you describe this configuration?

Answers:

a) Half duplex

b) Single duplex

c) Paused duplex

d) Switched duplex


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8. SPECIALIZATIONAUDIO

What do you understand by the term dBu?

Answers:

a) It is an absolute value based on a voltage reference of 0.775 Volts RMS

b) It is a voltage ratio based on 600 ohms impedance

c) It is a level used when impedance matching is necessary

d) It is a reference level based on 1 k ohm impedance


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9. SPECIALIZATIONTELEVISION

Fine details of a TV picture correspond to:

Answers:

a) Square waves

b) High frequencies

c) Medium frequencies

a) Low frequencies


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10. SPECIALIZATIONTRANSMITTERS

If the main power supply of an FM transmitter has a severe hum, what is the likely effect

on the transmitter output?

Answers:

a) Considerable reduction of carrier amplitudeb) Amplitude modulation on the outputc) Considerable increase of carrier amplituded) Overmodulation


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Answers to the Sample Questions

Question 1:The answer is: a) 14.7 mA

Question 2 :The answer is: a) -2.6 V

Question 3:The answer is: b) 6 V

Question 4:

The answer is: a) The circuit would stop oscillating and only restart when the short isremoved

Question 5:The answer is: a) Simultaneously

Question 6:The answer is: b) Circuit b

Question 7:The answer is: a) Half duplex

Question 8:The answer is: a) It is an absolute value based on a voltage reference of 0.775 Volts

RMS

Question 9:The answer is: b) High frequencies

Question 10:

The answer is: b) Amplitude modulation on the output


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Additional copies of this document can be obtained

from your local Human Resources Department,

your Supervisor/Manager or

Technical Support

P.O. Box 500, Station A

Toronto, Ontario, M5W 1E6

Telephone: 416-205-5756

Fax: 416-205-2420

Ce document est aussi disponible en franais de

CBC Montreal

1400, boulevard Ren-Lvesque Est

Montral, Qubec, H2L 2M2

Telephone: 514-597-3808Fax: 514-597-3860

group a exam guide october21-2011

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