Chapter 7.2, Problem 2RQ

Discuss the effect of operating conditions on performance of SSS-VCRS with the help of p-h diagram

A CNC worktable is driven in a linear direction by a lead screw connected directly to a stepper motor. The pitch of the lead screw is 5 mm. The stepper motor completes one full revolution upon receiving 600 pulses. If the worktable speed is 5 m/minute and there is no missed pulse, then the pulse rate being received by the stepper motor is (a) 20 kHz (b) 10 kHz (c) 3 kHz (d) 15 kHz

estion 1 The step resolution of a stepper motor is set for 1024 steps per revolution, Find the frequency to rotate at 60 rpm. (Give your answer in Hertz, put only numeric value) Question 3 A proportional valve is handled by an PWM signal Question 4 The speed of a stepper motor is controlled by Question 5 The relay is driven by an analog signal Question 6 Determine the output voltage from a PWM pin when the time ON is 25 ms and the frequency is 1kHz and Vcc-SV. (Put only a number in Volt, no need to add the unit word)

Please briefly explain the working principle of an Optical Encoder. Please use the sketch to help your explanation. Explanation.

- Consider the positions servomechanism is shown in figure below. Assume the following numerical values for the system constant are. Kp = gain of potentiometer detector = 7.64 v/ rad, Kb = back e. m. f. constant -5.5*10-2 V/rad/sec K₁ = motor torque constant = 6*10-5 Nm/A C₁ = 4*10-2 Nm/ (rad /sec). Determine the natural frequency and damping ratio of the system. Amp. % Ra= armature winding resistant =20, Ka=Gain of amplifier =10 Jm= 1*10-5 Kg.m². J₁=4.4*10-³ Kg.m² n = gear ratio=1/10, Neglect Cm and la constant 0050 N₁ DI

1. A mixing vat has an inlet valve, an outlet valve, a mixing motor, and a single level detecting switch (Figure 1). Both valves are opened by solenoids. The level switch closes when the vat is full and stays closed until the vat is empty. Draw a PLC ladder logic diagram and provide the allocation list to do the following: a. When the start button is pushed, the inlet valve opens until the vat is full. b. The mixer motor comes on for 5 min. c. The outlet valve opens until the vat is empty. (closed) Level switch Motor Inlet valve Outlet valve Float Vat Figure 1

5 Discussion 1-Is the PCM method of transmitting synch. Information channel? Explain your answer briefly 2-What is application of PCM? 3-Explain how the counter (freq.divider) control on the multi input data of address 4-What is the difference between DM&PCM?

**ONLY FIRST ATTEMPT **there will be three circuits in series (2 for conv and 1 for cond)

8. An R-L series circuit has a reactive power of 1234 VARs and an apparent power of 4329 VA. By how many degrees are voltage and current out of phase with each other? 9. An R-L series circuit contains a resistor and an inductor. The resistor has a value of 6.5 22. The circuit is connected to 120 V and has a current flow of 12 A. What is the inductive reactance of this circuit? 10. What is the voltage drop across the resistor in the circuit in Question 9? 11. A phase angle meter connected in an R-L series circuit indicates that the current is 28 degrees out of phase with the voltage. What is the circuit power factor? 12. An R-L series circuit has a power factor of 73%. If the apparent power is 560 kVA, what is the true power in the circuit?