Group __________________

Name ________________________________

Points 100/ ______

Variant 4

Vocabulary

1 Match the words with their definitions.

1	steam	a	is used to produce steam
2	down comer tubes	b	hot gas that water changes into when it boils
3	super heater	c	a blower that creates a positive pressure, forcing air into a combustion chamber
4	steam drum	d	are used to circulate water between the drums
5	draft fan	e	is used to dry or heat saturated steam

1___, 2___, 3___, 4___, 5___ 10/___

2 Underline the appropriate words.

1) There are different types of compressors used for common/different/similar uses on board.

2) Autotransformers have two/three/one winding.

3) Most of the marine compressors used are one/two/three staged reciprocating compressors with inter-cooling and after-cooling.

4) In measurement and control systems where directional indication is needed, servomotors/shaft generators/tachogenerators provide an easy way to determine that.

5) In terminal boxes, if conductors are not insulated, switches/phases/loads are to be separated from earth and from each other by substantial barriers of suitable insulating materials.

6) In silicon-controlled rectifier when the cathode is negatively charged relative to the anode, no circuit/current/liquid flows until a pulse is applied to the gate.

7) As the quantity of air is increased, the amount of fuel injection can/cannot/may be increased, which in turn will increase the power.

8) In steam turbine generator the steam is supplied at a pressure to a low/high/average speed turbine which is connected to an alternator shaft.

9) In fresh water generator the high/average/low temperature is provided by the jacket cooling water of the main engine in which a portion of jacket cooling water is delivered to fresh water generator to produce fresh water.

10) The inert gas is produced by the combustion of fuel oil with air in a water-cooled combustion chamber, in which controlled/uncontrolled/unpredictable, complete combustion takes place.

10/___

3 Fill in the gaps with the words.

monitor and control heat conduct single-core the furnace air heater

1) The system of tubes that surrounds _______________ is known as water wall or floor tubes.

2) The exhaust gas of the boiler is also put to use by making it pass over an_____________, which heats up the combustion air entering the furnace.

3) All boilers are fitted with various safety fittings and control system to_____________ various aspects such as fuel oil flow rate, flow of combustion air, and feed water supply.

4) Cooling is the process of removing_____________ from spaces, objects, or materials and maintaining them at a temperature below that of the surrounding atmosphere.

5) In case of three-core cable grounding is allowed to carry out using a_____________ flexible cable.

6) When the silicon-controlled rectifier begins to conduct, and continues to_____________ until the voltage between the cathode and anode is reversed or reduced below a certain threshold value.

12/___

Grammar