Chapter 3

Question 1

The methods to detect cooling water leaks in a surface condenser, while in operation are:

1. pH test
2. Electrical conductivity test
3. Plastic wrapping test
4. Silver nitrate test

A) 1, 3
B) 1, 2, 5
C) 2, 3, 4
D) 3, 4
E) 2, 4

Answer 1

E

Question 2

The ____________ cooling water is in direct contact with the turbine exhaust steam.

A) Jet condenser
B) Central flow condenser
C) Air ejector
D) Radial flow condenser
E) Down flow condenser

Answer 2

A

Question 3

The cooling water for the air ejectors on a surface condenser may be:

A) Raw water
B) Potable water
C) River water
D) Condensate
E) Waste water

Answer 3

D

Question 4

Power plant thermal efficiencies could be easily doubled by removing the ____________ and using the exhaust steam for heating.

A) De-aerator
B) Feed pump
C) Condenser
D) Hot well
E) Circulating pump

Answer 4

C

Question 5

The ____________ function is to continually extract the condensate from the condenser hot well and pump it through the air ejector coolers.

A) Cooling water pump
B) Circulating pump
C) Feedwater pump
D) Extraction pump
E) Vacuum pump

Answer 5

D

Question 6

An advantage of high-pressure feedwater heaters that use a ____________ design is less stress due to thermal expansion and contraction.

A) Low tube
B) Bent tube
C) Straight tube
D) “U” tube
E) “C” tube

Answer 6

D

Question 7

Air in a surface condenser:

1. Increases the pressure
2. Retards heat transfer
3. Enters with the high pressure air ejector steam
4. Is cooled before being removed

A) 2, 3, 4
B) 1, 2, 4
C) 1, 2, 3
D) 1, 3, 4
E) 2, 3

Answer 7

C

Question 8

The waterside pressure of a low pressure feedwater heater, of the straight tube design, is dependent on:

A) Discharge pressure of the extraction pump
B) Suction pressure of the extraction pump
C) Condenser pressure
D) Discharge pressure of the boiler feedwater pump
E) Suction pressure of the boiler feedwater pump

Answer 8

A

Question 9

When the tubes and the tube plates of a surface condenser are made of the same material the tubes can be ____________ into the tube plates.

A) Packed with metallic or fibre packing
B) Roll-expanded at inlet and ferruled at outlet
C) Welded
D) Ferruled
E) Roll-expanded

Answer 9

C

Question 10

The relief valve of a surface condenser, under normal operating conditions, is held closed by:

A) A vacuum
B) A spring
C) Water pressure
D) Pressure difference between the atmosphere outside and the vacuum inside the shell
E) Atmospheric pressure

Answer 10

D