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Worksheets141 S12-17
Total questions: 30
Worksheet time: 30mins
Name
Class
Date
1.
H in HVAC stands for
a)
Hybrid
b)
Hydrogen
c)
Heating
d)
Hospitals
2.
Natural ventilation uses
a)
blowers
b)
Fans
c)
things like open windows or louvers.
d)
All other answers
3.
Forced ventilation uses
a)
Fans
b)
Blowers
c)
Air Handler Unit (AHU)
d)
All other answers
4.
Air conditioned buildings will normally have
a)
Sealed windows
b)
Open doors
c)
Ceiling fans
d)
Glass windows
5.
Air conditioning has two basic classifications
a)
Systems which provide comfort air in offices and air in process areas
b)
Systems which provide comfort heating and cooling
c)
Systems which provide hot water and cold water
d)
All other answers
6.
Typical HVAC drawing types are
a)
Piping diagram
b)
Detail drawing
c)
Floor plans
d)
All other answers
7.
Portable equipment is an equipment that is
a)
Mobile
b)
easily moved
c)
designed and intended to be moved
d)
All other answers
8.
Heaters In a workshop, or manufacturing type area, where larger heating units are required, they may be supplied power from a
a)
Single phase supply
b)
3 phase supply
c)
2 phase supply
d)
Electrical store
9.
The elements in the infrared heater produce ____________which we feel as heat.
a)
Air
b)
electromagnetic waves
c)
Magnetic field
d)
All other answers
10.
To ensure portable equipment is safe for continued use, it is a requirement that portable electrical equipment is ___________on a regular basis.
a)
Washed
b)
Used
c)
tested and inspected
d)
All other answers
11.
Which type of motor winding provides constant current in the field and armature?
a)
Series
b)
Compound
c)
Shunt
d)
Cumulative compound
12.
What are DC motor Brushes made from?
a)
Steel
b)
Iron
c)
Carbon
d)
Copper
13.
What is the purpose of the commutator?
a)
Delivers current to the stator
b)
Regulates the motor running
c)
Helps stop the motor
d)
Delivers current to the armature
14.
What makes the rotor turn in a DC Motor?
a)
Loading of the motor
b)
Interaction between the magnetic fields
c)
Increased supply frequency
d)
Lowered supply current
15.
What is a key advantage of using DC motors?
a)
They can work on both AC and DC current
b)
They require no brushes
c)
It is easy to control motor speed
d)
A DC motor are more expensive AC Motor equivalents
16.
The simple design of DC motors makes service, maintenance and control well understood and easily supported. Speed control is simple: Just adjust___________ and you easily adjust the speed.
a)
Permanent magnet
b)
the terminal voltage
c)
shaft rotation
d)
size of motor
17.
Series-wound DC motors are used where _____________is required.
a)
Low starting torque
b)
high starting torque
c)
Low starting speed
d)
High starting speed
18.
__________________________have the field winding connected in series with the rotor winding,
a)
Series-wound DC motors
b)
Shunt-wound DC motors
c)
compound-wound DC motors
d)
combination-wound DC motors
19.
The ________________is an industry workhorse for both high and low power.
a)
Series-wound DC motors
b)
Shunt-wound DC motors
c)
Compound-wound DC motors
d)
Combination-wound DC motors
20.
__________________are the most widely used as they have a linear characteristic of voltage and torque.
a)
Series-wound DC motors
b)
Shunt-wound DC motors
c)
Compound-wound DC motors
d)
Combination-wound DC motors
21.
Which type of DC motor would be used for traction equipment?
a)
Compound Motor
b)
Series Motor
c)
Large Motor
d)
Shunt wound
22.
The Shunt Wound Motor is used where the speed is:
a)
Variable
b)
Unreliable
c)
Very fast
d)
Constant
23.
What can cause the damage to a motor?
a)
Water jets
b)
Air cooling the motor
c)
Regularly servicing the motor
d)
Securely fixing the motor
24.
What is ambient temperature?
a)
The heat from an Oven
b)
The temperature of the Sun
c)
The temperature of the air surrounding us
d)
How hot the motor gets at full load
25.
__________________________ has more constant and controllable speed over various loads.
a)
Series-wound DC motors
b)
Shunt-wound DC motors
c)
Compound-wound DC motors
d)
Combination-wound DC motors
26.
_______________________ are virtually suitable for almost all applications like business machines, machine tools, agitators and mixers etc.
a)
Series-wound DC motors
b)
Shunt-wound DC motors
c)
Compound-wound DC motors
d)
Combination-wound DC motors
27.
_________________________ are used to drive loads such as shears, presses and reciprocating machines.
a)
Series-wound DC motors
b)
Shunt-wound DC motors
c)
Compound-wound DC motors
d)
Combination-wound DC motors
28.
The exposed un-insulated components of DC motors; _________________, brush rigging and bolted connections are vulnerable to early electrical failure when the motor is sited in an inadequate enclosure.
a)
Commutator
b)
Stator
c)
Rotor
d)
Frame
29.
Many______________, wet or dry, are excellent conductors. These include carbon, metal dust and acid salts. Anything wet similarly conducts current quite well even at low voltages across distances of several inches.
a)
Insulators
b)
Semiconductors
c)
Contaminants
d)
Dust
30.
DC motors are de-rated by __________per 1000 feet above the 3300 feet.
a)
0.05
b)
0.08
c)
0.03
d)
0.1
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