around a supporting ceramic form. The film-type resistor is composed of a resistive film of carbon or metal deposited on or inside an insulating cylinder.
Resistors may be either fixed or variable. Continuously variable resistors, as distinguished from adjustable types, may be either composition or wirewound types.
Now speak about some of the details concerning resistors that you know and that are provided by the texts.
42 4
Record your answers on a tape.
1. What is to be done prior to replacing faulty components and adjusting new ones? (See ex. 33).
2. What is a power cam controller?
3. How does one select controllers?
43 12
Use the following suggested topics for discussion:
1. The unit is switched on, the armature oscillates, but the striker fails to strike the cup.
2. Motor fails to start.
3. Old brushes should be replaced. New ones should be ordered.
44 7
Listen to the following text carefully. Make up as many questions as you can. Retell the text.
Electric Drives of
Anchor-Handling and Mooring Gear
The electric drives of anchor-handling and mooring gear are used to heave in the anchor and perform mooring operations.
Accordingly, they are used in windlasses, anchor and anchor-mooring capstans, mooring capstans, automatic and non-automatic mooring winches. At present most of these machines are equipped with electric drives having special characteristics which suit the operating conditions of such machines.
According to the USSR Register the power rating of an electric drive used in the anchor-handling gear must be such that the anchor chain is heaved in at a minimum speed of 0.17 m/s with the sprocket pull*, in Newtons.
* тяговое усилие на звездочке.
45 6
Listen to the dialogue and discuss the advantages of being an astronaut.
I Would Be Flying a Space-Craft Now
Mr. Fry: If I were a space pilot I’d be circling the earth now.
Mrs. Fry: I suppose you would.
Mr.: And if you were one too, we’d be going together. I’d be gathering the scientific data, and you be making tea. . .
Mrs. (with determination): No, 1 would not!
Mr: (with a sarcastic smile): And what would you be doing if I may ask? Mrs. (proudly): I would be orbiting!
Mr.: That’s a jolly good idea, and 1 suppose you'd be wearing a space suit, and not that horrible pink dress of yours!'
Mrs.: I’m pretty sure you wouldn't be looking at me anyway.
Mr. (smilingly): I don't know about that, but at any rate I wouldn’t be carrying such a heavy bag of potatoes, and even if 1 were I’d feel nothing in the state of weightlessness. Oh! If only I were an astronaut!... Mrs.: Has it occurred to you what would happen if the launching equipment went wrong? No, darling, 1 definitely don't want you to be a space pilot!