Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 13, Problem 8SQ
To determine
Explain the operation of ultrasonic proximity detectors which is used to measure the distance of an object.
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Figure 2
3) *** The circuit of Figure 3 is designed with W/L = 20/0.18, λ= 0, and ID = 0.25 mA.
(Optional- 20 points)
a) Compute the required gate bias voltage.
b) With such a gate voltage, how much can W/L be increased while M1 remains in
saturation? What is the maximum voltage gain that can be achieved as W/L
increases?
VDD = 1.8 V
RD 2k
- Vout
Vin M₁
Figure 3
1) Rs = 4kQ, R₁ = 850 kQ, R₂ = 350 kQ, and R₁ = 4 kQ. The transistor parameters are
VTP = -12 V, K'p = 40 µA / V², W/L = 80, and λ = 0.05 V-1. (50 Points)
a) Determine IDQ and VSDQ.
b) Find the small signal voltage gain. (Av)
c) Determine the small signal circuit transconductance gain. (Ag = io/vi)
d) Find the small signal output resistance.
VDD = 10 V
2';
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Q11
Chapter 13 Solutions
Electric Motor Control
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- 2) The transistor parameters of the NMOS device in the common-gate amplifier in Figure 2 are VTN = 0.4V, K'n = 100 μA / V², and λ=0. (50 points) a) Find RD such that VDSQ = VDs (sat) + 0.25V. b) Determine the transistor W/L ratio such that the small-signal voltage gain is Av=6. c) What is the value of VGSQ? Сс 2 mA Rp T V=-1.8 V V+= 1.8 V Figure 2arrow_forwardCalculate the percent voltage regulation for a three-phase wye-connected 2500 kVA 6600-V turboalternator operating at full-load Unity power factor The per phase synchronous reactance and the armature resistance are 10.4 2 and 0.071 ≤2, respectively?arrow_forwardDon't use ai to answer I will report you answerarrow_forward
- Chose the correct answer: 1- A squirrel cage induction motor is not selected when (A) initial cost is the main consideration (B) maintenance cost is to be kept low (C) higher starting torque is the main consideration (D) all above considerations are involved 2- The torque of an induction motor is .............. (A) directly proportional to slip (B) inversely proportional to slip... (C) proportional to the square of the slip (D) none of the above 3- Insertion of resistance in the stator of an induction motor. (A) increases the load torque (B) decreases the starting torque (C) increases the starting torque (D) none of above tool to slip 10 or of the above 4- Increase in the length of air-gap in the induction motor results in the increasing of its (A) air-gap flux (B) magnetizing current (C) speed (D) power factor 5- In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor and PB is the number of poles of auxiliary motor. Then the speed of the set…arrow_forwardChose the correct answer: 1- The resultant flux in stator winding of three-phase induction motor is equal to (A) Maximum value of flux due to any phase (B) Twice of the maximum value of flux due to any phase. (C) 0.5 times the maximum value of flux due to any phase (D) 1.5 times the maximum value of flux due to any phase 2- Which one of the following starters cannot be used for 3-phase, star - connected, slip-ring induction motor? (A) Auto-transformer starter (B) Star-delta starter (C) Direct-on-line starter (D) Rotor resistance starter 3- The crawling in the induction motor is caused by.............. (A) low voltage supply (B) high loads (D) improper design of the machine (C) harmonics developed in the motor 4- The 'cogging' of an induction motor can be avoided by........... (A) good ventilation (B) using DOL starter (C) star-connecting of stator winding (D) having number of rotor slots more or less than the number of stator slots 5- The method which can be used for the speed control…arrow_forwardManual solution only, no Al usedarrow_forward
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