Q1: Choose the correct answer:
1- If the rotor of the induction motor is ……, then the
rotor frequency will be zero
(A) Rotating at no load.
(B) rotating at the synchronous speed.
(C) locked.
(D) All of the above.
2- The …….. winding is placed near the transformer
core.
A) primary.
B) secondary.
C) low-voltage.
D) high-voltage.
3- An ideal transformer does not have any
A) copper losses.
B) core losses.
C) leakage
flux.
D) All of the above....
Consider a shaft connected to motor at any location. Take its
appropriate snaps. Assume that the shaft is failed and it has to be
replaced. Measure all the required dimensions and variables
required. Design and analyze a shaft considering
Static and Fatigue failure criteria,
Factor of Safety, Manufacturing processes, Material properties
For each of the following terms, describe if they (1) are in
eukaryotes or prokaryotes, (2) help increase or decrease
transcription, (3) are proteins or DNA elements, (4) are cis- or
trans-acting.
(a) activator
(b) enhancer
(c) repressor
(d) operator
(e) transcription factor
(f) initiator
An electric motor exerts a constant torque of τ=10N⋅m on a
grindstone mounted on its shaft; the moment of inertia of the
grindstone is I=2.0kg⋅m2. If the system starts from rest, find the
work done by the motor in 8.0 s and the kinetic energy at the end
of this time. What was the average power delivered by the motor?
Part A:Suppose we now turn off the motor and apply a brake to bring
the grindstone from its greatest angular...
Question1) A motor shaft is subjected to 4 kN axial load and 2
kN radial load. shaft rotates 800 rpm and its roller bearing has
lh=10000 hours working life.Choose the single row roller bearing
.(define the diameter of shaft)(Can you assign it to the table
pictures.)
A4-pole,250V, 50Hz single phase induction motor has rotor
frequency 2 Hz, in starting has following parameters: main winding
Rm=2 Ω ,Xm=4 Ω and staring winding : Rs =4 Ω , XLS=2 Ω ,Xcs=8 Ω.
Find : speed of motor, Im , IS, θm θs, α and p.f.
a) Give TWO (2) types of rotor in synchronous machine and
describe the differences of these two rotors.
b) A three-phase 11kV, 12 MVA, 50 Hz, 4 poles, Y-connected, 0.9
power factor lagging synchronous generator has a synchronous
reactance and armature resistance of 0.05 Ω and 0.4 Ω per phase
respectively. Under full load condition, the friction and windage
losses are 60 kW and the core losess are 39 kW. Determine:
i) The generator speed at no-load condition in rpm...
1 a) Describe when you believe it is appropriate to use the
following terms in developing data reports for a healthcare
organization: mean, median and mode. Why?
1 b) Find a healthcare organization’s description of how it
utilizes big data. Review their description of this usage: For what
purpose? Who performs the actual analysis? Can you tell whether the
analysis is done internally or externally? Are the results current?
Are the results useful in some way, and is that usefulness...