Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 24, Problem 2SQ
To determine
Explain the working principle applied to a DC starter.
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Q) For the RC circuit shown in Fig. 1, S is closed at t=0 sec. S is opened at t = 150 usec,
a) Write the mathematical expression for ic and vc for t=0 sec. to 1=150 usec.
b) Write the mathematical expression for ic and vc for t≥150 μsec.
c) Sketch ic and ve on the same time axis.
Fig.1
12A
S
10 Ohm
5 Ohm
2 uF
15 Ohm
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12.21 Determine iL(t) in the circuit of Fig. P12.21 for t ≥ 0,given that the switch was opened at t = 0 after it had been closedfor a long time, us = 12 mV, R0 = 5 W, R1 = 10 W, R2 = 20 W,L = 0.2 H, and C = 6 mF.
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- Consider the waveguide Calculate the phase constant, phase velocity and wave impedance for TE10 and TM11 modes at the operating frequency of 15 GHz. Answer: For TE10, 6 = 615.6 rad/m, u = 1.531 × 108 m/s, TE = 192.4. For TM11, B = 529.4 rad/m, u = 1.78 × 10° m/s, TM = 158.8 0.arrow_forwardAn air-filled 5- by 2-cm waveguide has Ezs = 20 sin 40лx sin 50лу eBz v/m at 15 GHz. (a) What mode is being propagated? (b) Find B. (c) Determine Ey/Ex. Answer: (a) TM21, (b) 241.3 rad/m, (c) 1.25 tan 40лx cot 50ду.arrow_forwardWrite the general instantaneous field expressions for the TM and TE modes. Deduce those TE01 and TM12 modes.arrow_forward
- 2B: The relays of type ID_MT on The Feeders circuit breakers have a current setting of 125% CT ratio yoo/5 and atime multiplier setting of 400/5 0.5A three phase fault current of 5000A Flows through feeders, The characteristics of The relay given in atable for PS_M=1 calculate: Ⓒ Feeders relay current RSM and The actual operating time IF The Feeder supplied by transformer Find The TSM For The trans former overcurrent relay Take The discrimination time 0.5 sec. CT ratio 1000/ and CS-100% 10621.7 PSM: Time sec 2.2 20 16 12 2.5 2.75 3 3.8 10 12arrow_forwardDon't use ai to answer I will report you answerarrow_forwardDon't use ai to answer I will report you answerarrow_forward
- The quantum efficiency of a pin-photodiode is 75 % at a wavelength of 1320 nm. The diode’s capacitance is 11 pF. For an input optical power of 1 mW, evaluate the mean (4)arrow_forwardDon't use ai to answer I will report you answerarrow_forwardanA fluid level control system includes a tank, a level sensor , a fluid source and an actuator to control fluid inflow. Show how the fluid level could be digitally controlled using a block diagramarrow_forward
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