4Th Class Power Engineering Chapter 91

Front 1

A modulating pressure atomizer has its return oil flow regulated by:

1) A modulating valve to the burner

2) A temperature control valve to the burner

3) Pump speed

4) A solenoid valve in the return line

5) A modulating valve in the return line

Back 1

A modulating valve in the return line

Front 2

Before atomization can occur, heavy oils are heated to approximately:

1) 95°C

2) 203°C

3) 115°C

4) 150°C

5) 75°C

Back 2

95°C

Front 3

An air atomizing compressor is usually:

1) A variable displacement type

2) A positive displacement type

3) A centrifugal type

4) An axial type

5) A regenerative type

Back 3

A positive displacement type

Front 4

The capacity of a constant capacity mechanical atomizer is a function of:

1) Oil viscosity

2) Pump speed

3) Supply pressure

4) Pump size

5) Orifice size

Back 4

Orifice size

Front 5

The compressed air used as atomizing air in the air atomizing oil burner is also called:

1) Pre-compressed air

2) Secondary air

3) Pre-mixed air

4) Primary air

5) Post-compressed air

Back 5

Primary air

Front 6

A relief valve is placed on the discharge of a fuel oil pump:

1) So burner design pressure is not exceeded

2) To prevent over firing of the boiler

3) Because the pump is a dynamic type

4) So burner capacity is maintained

5) To prevent pump rupture

Back 6

So burner design pressure is not exceeded

Front 7

Oil burners can be divided into three classes:

1. Air and steam atomizing burners

2. Mechanical or pressure atomizing burners

3. Centrifugal or rotary cup burners

4. Atmospheric pressure burners

5. Gravitational pressure burners

1) 2, 3, 5

2) 1, 2, 3

3) 1, 2, 4

4) 2, 3, 4

5) 3, 4, 5

Back 7

2) 1, 2, 3

Front 8

An air atomizing burner utilizes an air pressure of approximately:

1) 100 kPa

2) 15 kPa

3) 75 kPa

4) 95 kPa

5) 150 kPa

Back 8

100 kPa

Front 9

Burner light oil supply pressure range is approximately:

1) 150 to 250 kPa

2) 700 to 850 kPa

3) 550 to 700 kPa

4) 300 to 550 kPa

5) 50 to 100 kPa

Back 9

550 to 700 kPa

Front 10

When using mechanical fuel oil atomization:

1) 70 kPa steam pressure is required at the burner

2) Steam pressure is required to keep the bypass open

3) 35 to 40 kPa oil pressure is required

4) High pump pressure is required

5) Dry saturated steam or superheated steam should be used

Back 10

High pump pressure is required

Front 11

Maximum static pressure in a fuel oil line is approximately:

1) 70 kPa

2) 35 kPa

3) 80 kPa

4) 15 kPa

5) 10 kPa

Back 11

70 kPa