6
Choose the suitable form.
The limiting current . . . probably ... a very large temperature coefficient, a) will be having; b) is to have; c) would have.
7
Complete the sentence in such a way that it makes sense.
Counters are fully programmable that is. . .
a) count input is pulsed while the other count input is high;
b) each output may be preset to either level by entering the desired data at the data inputs while the load input is low;
c) the output will change to agree with data inputs independently of the count pulses.
8
Complete the sentence in such a way that it makes sense, the order for delivery of a magnetic controller must contain the following information: a) application, class of protection, type, rated current, number of startings per hour, operating duty, electric wear resistance level, control circuit voltage, settings of thermal protection relays; b) application, type, voltage, rated current, operating duty, vitrified resistors, settings of the thermal protection relays; c) type, protection relays, provision of a built-in disk brake, design version, number of free ends of the shaft, set number, provision of a spares set. >4>>5>6
SHIPBOARD AUTOMATION
SECTION
(4+1+4)
The first class period
15
13
Review of “Shipboard Electrical Equipment”. Topical content: Alarm measuring system. Grammar item: English Syntax.
Text
Alarm Measuring System
1. The electronic and alarm measuring systems are designed for centralized supervision of processes on board ships. -
2. Such systems are designed to meet the special requirements in marine applications.
3. The design of the alarm systems comprises a limited number of standard modules, and offers an economical and flexible solution for all system sizes — from small alarm systems with a few channels, to complex systems with data logging and alarm print-out functions.
4. The signals from analog and digital transducers are processed in the system and allow for simple and clear monitoring of process activities. The occurrance of abnormal conditions initiates audible and visual alarm signals.
5. Temperatures, pressures, levels, etc. are sensed by the analog transducers and are represented on a digital display.
6. Some further important advantages of the electronic alarm system arc:
— All transducer signals are individually processed, i. e. by one circuit board per measuring and alarm channel. If one of the channels should fail, the rest of the system will remain uneffected.
— Data for each channel, time delay, alarm group, scale gaud number of decimals, are set by programming on each circuit board.
— If necessary the system layout can be modified by the customer, by moving the transducer connections, the corresponding circuit board and the transparent legend plate, without the need for taking the programming into consideration.
— Each channel can be equipped with separate lamps for alarm indication on mimic diagrams and analog instruments, for continuous presentation of the measured values.
Look through the text and list the advantages of the electronic alarm system.
6
2
Read the passages containing the information on:
a) the purpose of the system;
b) its construction features;
c) its operation and advantages of the system.
Read the text paying attention to the word order of English sentences.
The second class period 4
Repeat the words after the teacher. Then read paying attention to their Russian equivalents.
time delay alarm group
scale and number of decimals
system layout to modify customer
transducer connection transparent legend plate alarm indication mimic diagram analog instrument
continuous presentation
5
Read the text carefully. Use ex. 4.
alarm measuring system
process
to process
marine application
data logging
alarm print-out function
digital transducer
simple and clear monitoring of
process activities
to initiate
audible
to sense
circuit board
one circuit board per measuring and alarm channel
12
them by yourself
— система аварийной сигнализации и измерения
— технологический процесс
