4Th Class Power Engineering Chapter 142

Front 1

Overheated oil in fired heater's tubes breaks down to form:

1) Clinkers

2) Ash

3) Coke

4) Carbonic acid

5) paraffin

Back 1

Coke

Front 2

The maximum temperature of oil which can be pumped by a hot oil pump when teflon is used as a non-metallic part of the mechanical seal is:

1) 150ºC

2) 350ºC

3) 250ºC

4) 200ºC

5) 100ºC

Back 2

200ºC

Front 3

In a hot oil system, there is a protective device called a "surge tank low oil level". What is the function of this device?

1) Shuts down the pilot burner only

2) Prevents loss of suction to the pump

3) Stops the flow of the thermal fluid

4) Reduces the firing rate to its minimum

5) Shuts down the flare stack

Back 3

Prevents loss of suction to the pump

Front 4

The most typical fired heater model is the:

1) Induced-draft

2) Dual-draft

3) Balanced-draft

4) Down-draft

5) Up-draft

Back 4

Up-draft

Front 5

After a hot oil system has been shut down, what is the recommended circulation time for the hot oil?

1) 30 minutes

2) 60 minutes

3) 5 minutes

4) 45 minutes

Back 5

30 minutes

Front 6

The approximate efficiency of a hot oil radiant heater is:

1) 30 - 40%

2) 25 - 35%

3) 40 - 50%

4) 50 - 60%

5) 45 - 65%

Back 6

40 - 50%

Front 7

The initial fill of a hot oil system surge tank is done by:

1) Bulk truck

2) Use of a vacuum pump

3) Bucket brigade

4) Pipe line

5) Field pressure

Back 7

Bulk truck

Front 8

Structural support beams that strengthen and support furnace heaters are mounted on:

1) Concrete saddles

2) Concrete pads

3) Concrete piers

4) Concrete cement

5) Steel bedplates

Back 8

Concrete piers

Front 9

An emergency shutdown (ESD) is _____ activated.

1) Sequentially

2) Systematically

3) Automatically

4) Hydraulically

5) Manually

Back 9

Manually

Front 10

Hot oil fired heaters have how many burners?

1) 2 - 10

2) 2 - 20

3) 10 - 50

4) 1 - 100

5) 4 - 40

Back 10

2 - 20

Front 11

The safety valve on the discharge side of the pump in a hot oil system discharges to the:

1) Surge tank

2) Combustion chamber

3) Flare stack

4) Drain pit

5) Hot oil user

Back 11

Surge tank

Front 12

Flange faces used in hot oil system construction should be:

1) Grooved and raised

2) Smooth and raised

3) Grooved and recessed

4) Threaded

5) Smooth and recessed

Back 12

Smooth and raised

Front 13

Hot oil convection heaters have an approximate efficiency of:

1) 70 - 80%

2) 85 - 95%

3) 80 - 90%

4) 55 - 65%

5) 75 - 85%

Back 13

75 - 85%

Front 14

In order to keep some hot oil flowing backwards through a standby pump and around the discharge check valve, it is important that the _____ valve be left open.

1) Automatic

2) Pneumatic

3) Relief

4) Suction

5) Bypass

Back 14

Suction

Front 15

A temperature and pressure which could be expected at the exit of a fired hot oil heater is between:

1) 235 to 290ºC and 450 kPa

2) 120ºC and 60 kPa

3) 150 to 300ºC and 400 kPa

4) 450 to 500ºC and 255 kPa

5) 60ºC and 120 kPa

Back 15

235 to 290ºC and 450 kPa

Front 16

In order to avoid unstable burner operation in the event of high or low fuel gas pressure, hot oil heaters are equipped with:

1) A pilot burner flame failure device

2) A by-pass line and a sump tank

3) A high stack temperature switch

4) An emergency shutdown device

5) A high or low fuel gas pressure shut down device

Back 16

A high or low fuel gas pressure shut down device

Front 17

Coking of hot oil in heater tubes would begin to take place at:

1) 350ºC

2) 260ºC

3) 150ºC

4) 275ºC

5) 200ºC

Back 17

260ºC

Front 18

With regard to oil leaving each heater pass, what is of particular importance?

1) Pressure

2) Temperature

3) Flash point

4) Volume

5) Velocity

Back 18

Temperature

Front 19

A hot oil pump suction strainer should be inspected and cleaned after how long following initial circulation of hot oil through the system?

1) 1 - 2 hours

2) 6 - 8 hours

3) 3 - 4 hours

4) 5 - 6 hours

5) 4 - 5 hours

Back 19

3 - 4 hours