WorksheetsIDA-201 Unit 17
Total questions: 30
Worksheet time: 15mins
Name
Class
Date
1.
A motor's speed is determined by ____.
a)
number of motor poles
b)
amperage
c)
voltage
d)
size
2.
Start windings are placed ____ with the run windings.
a)
slightly out of phase
b)
180 degrees out of phase
c)
in phase
d)
in series
3.
The start windings have ____.
a)
more turns than the run windings
b)
fewer turns than the run windings
c)
the same number of turns as the run windings
d)
larger diameter wire than the run windings
4.
A split-phase has a ____ winding and a ____ winding.
a)
start, run
b)
start, common
c)
common, run
d)
run, common
5.
When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a ____.
a)
centrifugal switch
b)
circuit board
c)
capacitor
d)
dual voltage switch
6.
A split-phase motor that has a current relay and a start capacitor is called a(n) ____ motor.
a)
Capacitor Start, Induction Run (CSIR)
b)
Capacitor Start, Capacitor Run (CSCR)
c)
Induction Start, Induction Run (ISIR)
d)
Permanent Split Capacitor (PSC)
7.
When a Capacitor Start Induction Run (CSIR) motor is running and up to speed, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)
a)
5 microfarads
b)
4 microfarads
c)
20 microfarads
d)
25 microfarads
8.
A permanent split capacitor (PSC) motor that is running and up to speed will have the start winding ____.
a)
energized
b)
de-energized
c)
in series with the run winding
d)
removed from the circuit
9.
When a Capacitor Start, Capacitor Run (CSCR) motor initially starts, what is the total capacitance acting on the motor? (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads, if present.)
a)
25 microfarads
b)
20 microfarads
c)
5 microfarads
d)
15 microfarads
10.
Capacitors wired in series with the starting winding provide a(n) ____.
a)
greater starting torque
b)
longer starting time
c)
aid in starting three phase motors
d)
more efficient operation at full load speed
11.
The shaded pole motor ____.
a)
has little starting torque
b)
has excessive starting torque
c)
has greater efficiency than most split-phase motors
d)
will start against a heavy starting load
12.
Three phase motors have ____.
a)
run windings only
b)
three start and three run windings for each phase
c)
one start and one run winding for each phase
d)
a start switch in each phase circuit
13.
A current magnetic relay opens and closes its contacts based on the ____.
a)
current in the run winding
b)
voltage across the run winding
c)
voltage across the start winding
d)
current in the start winding
14.
The starting device usually used on single phase, fractional horsepower motors requiring low starting torque is the ____.
a)
current relay
b)
potential relay
c)
centrifugal switch
d)
differential relay
15.
The positive temperature coefficient resistor start device is a type of ____.
a)
variable resistor
b)
capacitor
c)
switching device
d)
diode
16.
A permanent split-capacitor motor has a ____.
a)
run capacitor only
b)
start and run capacitor
c)
start capacitor only
d)
split phase capacitor
17.
The heavier the load on an operating motor, the greater the amount of slip.
a)
True
b)
Fasle
18.
The centrifugal switch mounted on the shaft of a split-phase motor has a normally closed contact.
a)
True
b)
Fasle
19.
The contact(s) in a potential type starting relay are normally closed.
a)
True
b)
Fasle
20.
Once the start winding and the start capacitor have been removed for the circuit, the motor will continue to operate with only the run winding energized.
a)
True
b)
Fasle
21.
The microfarad rating of the run capacitor is much lower than that of the start capacitor for any given motor application.
a)
True
b)
Fasle
22.
The contact(s) in a current type starting relay are normally closed.
a)
False
b)
True
23.
The resistances of the windings in a three phase motor are all equal.
a)
True
b)
False
24.
The ______________ is a winding that, when energized, will generate a magnetic field as there will be current flowing through it.
a)
Stator
b)
Potential
c)
Microfarad
d)
Capacitor
25.
The rotating portion of an electric motor is called the ____________________.
a)
Rotor
b)
Cage
c)
Phase
d)
Capacitor
26.
The difference between synchronous speed and full load speed is called ____________________.
a)
Slip
b)
Difference
c)
Half speed
d)
loaded
27.
The coil of a potential relay has ____________________ resistance.
a)
High
b)
Low
c)
Mild
d)
No
28.
On a potential relay, the coil is connected between terminals 2 and ____________________.
a)
5
b)
1
c)
3
d)
4
29.
What is meant by the "phase angle" in an alternating current circuit?
a)
Phase angle refers to the amount by which the current leads or lags the voltage.
b)
Phase angle refers to the amount by which the voltage leads or lags the voltage.
c)
Phase angle refers to the amount by which the watts leads or lags the voltage.
d)
Phase angle refers to the amount by which the microfarads leads or lags the voltage.
30.
When not air cooled, the heat generated by the motor in a hermetic motor-compressor assembly is removed by what?
a)
Refrigerant Vapor
b)
Refrigerant liquid
c)
Water
d)
Water-Vapor
100 %
