What is an internal relay?

What are typical uses for control relays

A Flyback converter (for questions 1-3) shown below has the following parameters. Vin=100V, Vo=20v, Po=40W, D=0.25, Fsw=250kHz iin i out in 1. What is the turns ratio N1:N2 between the primary side winding and the secondary side winding? A. Ν1: N25:3 B. N1: N2 = 3:5 C. N1: N2= 5:2 D. None of the above %3D 2. What is the maximum voltage on the power switch? A. 120V В. 133V С. 100V D. None of the above 3. What is the maximum voltage on the diode? Α. 40V В. 133V C. 80V D. None of the above 4. The magnetizing inductor at the primary side winding is 100uH, what is the peak current in the power switch? Α. 1.8Α В. 1.6A С. 2.1A D. None of the above

DISCUSSION: 1. What is mean by sequencly connection. 2. What is the benefit of using the, connectors (C], C2} in a timer circuit (RT). 3. Draw control circuit on operation three phase motors.

Assume that HOA SW 120 has been set in the AUTO position. List four ways by which coil CR-8 could be energized.

J1. What are the standard identification letters for the shunt field winding of a DC compound motor? a) A1 and A2 b) S1 and S2 C) F1 and F2 d) none of the above J2. The commutating field is another term for interpoles. a) true b) false J3. What are the standard identification letters for the commutating field winding of a DC compound motor? a) C1 and C2 b) S3 and S4 c) either "a" or "b" d) neither "a" nor "b"

1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn

what is doubly fed induction motor how it works and also examples based on this motor.

Explain why the use of switching drives can be problematical when driving an inductive load, and how any problems may be overcome

14.a. An encoder is a device that is used toA. excite the motor's interpoles.B. feed pack position information.C. reduce brush sparking.D. commutate the field windings.14.b. The letters CEMF are used to describeA. centrifugal forces within a motor.B. the portion of the supplied current that is converted to heat.C. countervoltages and currents created within a motor.D. critical winding currents that should not be exceeded.