Exercise Six

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Complete these sentences. Use all the words in the box only once.
disconnects / valve / chamber / include / turbine / install / piston / electro-magnet / dismantle / terminal / release / rotor
1 In this type of engine, a single moves up and down and makes the shaft rotate.
2 When you switch off the current to the , it can't pull the relay switch.
3 The outlet allows the water to leave the pump, but stops it from flowing back in.
4 The of a helicopter has a hub and four large blades.
5 If you press the accelerator pedal, the car goes faster. If you it, the car slows down.
6 The purpose of the large in the pump is to contain the fluid.
7 When the switch is not touching the , the circuit is open.
8 The motor isn't working. You should it and clean all the components.
9 The below this hydro-electric dam produces many gigawatts of electricity.
10 The building is 442 metres high. This height doesn't the 10-metre antenna. With the antenna, the height is 452 m.
11 We need to a new cooling system in your car.
12 That emergency stop button the machines from the power source.
Write the the correct words in the gaps.
13 Water falls onto the blades of the turbine. This makes the turbine (rotated / rotating / rotate)
14 When you close the stop valve, this prevents the water (to flow/ from flowing / isn't flowing).
15 Open the door and allow the smoke (from escaping/ to escape/ will escape) from the room.
16 The security man does not let anyone (entering/ to enter/ enter) the factory after dark.

One word is missing from each sentence. . Write the word in the space.
17 How many wheels the Mars rover have?
18 Can you see the rover? What the rover doing now?
19 If the wind speed too strong, the controller switches off the turbine.
20 This electric circuit consists a battery, a wire, a switch and a lamp.
Choose the correct words. Write A, B, C or D in each space.
21 When your damaged radio to the repair shop?    A) you take    B) did you take    C) you took    D) have you taken
22 I'm pressing the brake pedal hard, but the car stopping.    A) won't    B) aren't    C) isn't    D) doesn't
23 How fast the blades of the helicopter rotate?    A) do    B) does    C) are    D) have
24 I'm sorry. installed the new air conditioner yet.    A) I'm not    B) I didn't    C) I don't    D) I haven't
25 If the wind is more than 90 km/h, the controller causes the turbine .    A) to switch off    B) switching off    C) switch off    D) switches off
26 you buy the new safety equipment yesterday or last week?    A) Do    B) Did    C) Have    D) Are
27 When take photographs of the damaged wing?    A) you will    B) you are    C) will you    D) are you
28 you repaired the broken pipe yet?    A) Are    B) Do    C) Did    D) Have
29 When the fire alarm sounded at 3 pm yesterday, everyone the factory.    A) leaves    B) has left    C) is leaving    D) left
30 The mechanic checked the brakes, but he adjust the tyre pressures.    A) doesn't    B) didn't    C) hasn't    D) isn't
Fill in the gaps in the text. Use the words in the box.


allows / operate / wide / rotate / attached / motor / about / is / can / on / of / to
The Mars rover has a body, six wheels, two robot arms, two antennas and a mast. The antennas and the mast are mounted (31) the top of the body, and the robot arms are (32) to the front of the body. The rover is more than 2 metres long, and about 1 metre (33). Its height (34) more than 2 metres. It weighs just under 800 kg. The rover has six wheels, and a special suspension system. The wheels are made (35) titanium and are 25 cm in diameter. The suspension system (36) the six wheels to remain on the ground all the time. There is a strong (37) on each wheel. This allows the rover to (38) 360 degrees. It can travel 90 metres per hour (maximum), but most of the time it moves at a speed of (39) 30 metres per hour. The Rover can (40) in temperatures from -120 degrees C minimum (41) 85 degrees C maximum. The Rover (42) travel up to 200 metres per day.
Write eight sentences for a newspaper article about a new wind turbine. In your sentences, answer the questions in the box, using the information in the notes.
What has the president done? (open / new wind turbine) 43 The president .
When did the engineers complete it? (two weeks ago) 44 The engineers .
What will the new wind turbine be able to do? (produce 150 MW of electricity) 45 The new wind turbine .
How tall is the tower of the turbine? (28 meters) 46 The tower .
How does it work? (wind Ò blades / rotate) 47 This is how it works. First, the wind makes .