4Th Class Power Engineering Chapter 107

Front 1

An example of a final control device for a heating system is a:

1) Slide-gate

2) All of the above

3) Fan

4) Set of louvers

5) Pump

Back 1

All of the above

Front 2

Pneumatic controllers are divided into two basic classes:

1) Bleed and non-bleed

2) Off/on and proportional

3) Reset and gain

4) Positive and negative action

5) Direct and indirect

Back 2

Bleed and non-bleed

Front 3

The device used to maintain a constant pressure throughout a pneumatic control system is called a:

1) Pneumatic valve

2) Balancing valve

3) Proportional band controller

4) Reducing valve

5) Control regulator

Back 3

Reducing valve

Front 4

In the pneumatic control nozzle and vane system the:

1) Nozzle pressure decreases allowing the vane to move closer

2) Vane and nozzle both move to maintain equilibrium

3) Vane approaches the nozzle decreasing air pressure

4) Vane approaches the nozzle increasing air pressure

5) Nozzle pressure increases moving the vane further away

Back 4

Vane approaches the nozzle increasing air pressure

Front 5

The effective range of control pressure used in 103 kPa circuits is usually considered to be from:

1) 3 to 15 kPa

2) 2 to 25 kPa

3) 0 to 100 kPa

4) 20 to 90 kPa

5) 15 to 75 kPa

Back 5

20 to 90 kPa

Front 6

A non-bleed controller bleeds control air:

1) When the control air pressure is decreased

2) When the control air pressure is increased

3) Non-bleed controllers do not bleed air

4) When the supply pressure is decreased

5) When the supply pressure is increased

Back 6

When the control air pressure is decreased

Front 7

A pneumatic control system consists of which of the following essential parts:

1. An air compressor with storage tank, filter, and reducing valve

2. Air piping and tubing forming the air distribution system

3. Controllers such as rheostats

4. Controlled devices such as convector valves, zone valves, and damper operators

1) 2, 3, 4

2) 1, 2, 3

3) 1, 2, 4

4) 1, 3, 4

5) 1, 2, 3, 4

Back 7

3) 1, 2, 4

Front 8

Dual temperature thermostats are set at two different temperatures and the transfer from one to the other is made by changing the supply air pressure from:

1) 5 kPa to 25 kPa

2) 20 kPa to 90 kPa

3) 0 kPa to 100 kPa

4) 100 kPa to 125 kPa

5) 3 kPa to 15 kPa

Back 8

100 kPa to 125 kPa

Front 9

An example of an auxiliary device for a pneumatic control system would be a:

1) Bellows

2) Three way air valve

3) Damper

4) Reducing valve

5) Pump

Back 9

Three way air valve

Front 10

The most common type of damper operator is a:

1) Piston

2) Slide

3) Pilot positioner

4) Ramp

5) Bellows

Back 10

Piston

Front 11

A pneumatic relay can also be called a:

1) Cumulator

2) Bleed type controller

3) Pneumatic-electric switch

4) Selector switch

5) Air reservoir

Back 11

Cumulator

Front 12

In a non-bleed type controller, the device that senses a change in room temperature is called a:

1) Sensing valve

2) Set point gauge

3) Bellows

4) Temperature switch

5) Feedback switch

Back 12

Bellows