Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 19, Problem 2RQ
Why is it necessary to pick between the commutator bars of DC machines?
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2) In an DC machine, ______________________________ provides the mechanical support to the whole machine.
Select one :
Yoke
Brushes
Pole shoe
Interpoles
Select the proper choice(s) for each of the following statements:
1) To control single-acting cylinder we just need:
double-acting cylinder we should use
A2/2-way, 5/2-way,
(C) 3/3-way, 3/4-way,
2) In
DCV.
(B) 3/2-way, 4/2-way,
(D) 4/3-way, 3/2-way.
mid poistion of DCV, we can move cylinder piston rod freely without
resistance by hand.
(A) working ports are exhausted,
(C) working ports are pressurized,
3) In pneumatics we use
A Compressor
(B) Pump,
DCV, while to control the
4) Quick exhaust valve is used to
(A) increase the cylinder return speed.
(C) meter-out the cylinder speed
(B) all ports are closed.
no one of these options.
to obtain high pressure air.
(C) Turbine,
(D) pressure relief valve.
(B) meter-in the cylinder speed,
(D) increase the cylinder extending speed.
6) Meter-in of cylinder movement is used to control the
Afluid that enters the hydraulic cylinder,
(B) fluid that exits the hydraulic cylinder,
(C) fluid that enters the DCV
(D) fluid that exits the DCV.
5) One of the…
In DC machine,
used to collect the
current from the armature winding.
Chapter 19 Solutions
Electrical Transformers and Rotating Machines
Ch. 19 - Why is it necessary to keep lubrication records...Ch. 19 - Why is it necessary to pick between the commutator...Ch. 19 - What are the effects of improper brush tension in...Ch. 19 - What instrument is used to test the insulation of...Ch. 19 - How do you check for an open armature winding?
Ch. 19 - What instrument is generally used to test an...Ch. 19 - Prob. 7RQCh. 19 - Prob. 8RQCh. 19 - Prob. 9RQCh. 19 - Assume that a nine-lead dual-voltage motor is...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What type of armature winding is generally used for machines designed to operate on low voltage and high current?arrow_forwardA three-phase squirrel-cage motor is connected to a 60-Hz line. The full-load speed is 870 RPM. How many poles per phase does the stator have?arrow_forward1- What are the functions of accumulators?2- Draw the hydraulic symbols for a pressure –temperature compensated flow control valveand Bidirectional motor?arrow_forward
- The amount of counter torque developed by a direct current generator is proportional to what?arrow_forwardFor a cylindrical-rotor synchronous machine, the magnitude of the internal generated voltage is |Eg| = 240 volts, and the magnitude of the terminal voltage is |Vt| = 200 volts. Which of the following is true? a. The machine is operating as a generator. O b. The machine is operating as a motor. O C. Information is insufficient to determine the operating mode of this machine.arrow_forwardIn speed coontrol of dc motor, the final control element is motor. Select one: O True Falsearrow_forward
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