Electrical Engineering Answers

Design a sequence detector by using JK flip-flops. The sequence detector has one input x and one output y. When a sequence equivalent to least significant 4 bits of your roll number (*after converting your roll number to base-2) is detected at the streaming input x the output y is set to high (y=1). Unless the desired sequence is detected, the output y remains low (i.e., y=0). The detector should also be capable of detecting the overlapping sequences (if applicable) received at the input.

a) Draw state flow diagram (optimized)

b) Draw state transition table.

c) Find minimized expressions for inputs of flip-flops and output of the circuit.

d) Draw circuit diagram. 

my roll number is 029 convert this into base 2 and design the sequence detector for least 4 bits sequence.

A transformer has a voltage 480 V and

current 2.5 A on the primary side. And 80 V

on the secondary. What is the secondary

current on the load.

Select one:

a. 30 A

b. 20 A

C. 15 A

d. 10 A

e. 5 A

For low-pass RL filter with R = 20 Ω and L = 2 mH , the corner frequency is:

Select one:

a. 3,979 Hz

b. 796 Hz

c. 1,592 Hz

d. 19,894 Hz

e. 7.958 Hz

 A sinusoidal voltage having a maximum amplitude of 625 V is applied to the terminals of a 50 Ω

 The average power delivered to the resistor is:

 Select one:

 a 19531.25 W

 b 6510.42 W

 c 3906.25 W

 d 9765.63 W

 e 4882.61 W

An electrical load operates at 240 V rms The load absorbs an average of 8 Kw at lagging power factor of 0.9 The load impedance is:

 Select one:

 A 5.04 L 45 57 °Ω

 B 3.6 L 60 °Ω

 C 5.76 L 36.87 °Ω

 D 4.32 L 53.13 °Ω

 E 6.48 L 25.84 °Ω

An electrical load operates at 240 V rms. The load absorbs an average of 5 KW at lagging power factor of 0.8 The reactive power Q is:

 Select one

 a 3.75 KVAR

 b 4.50 KVAR

 c 6.00 KVAR

 d 6.75 KVAR

 e 5.25 KVAR

Let Vab =300 V in a balanced Y-connected

 three-phase generator with a phase

 sequence acb, then Vbn is:

 Select one:

 a 173L-30° V

 b 173L-150° V

 c 173L+150° V

 d 173L-270° V

 e 173L +30° V

A sinusoidal voltage with a period (time

 interval) of 0.1 ms . The radian frequency w

 is:

 select one:

 a. 62830 rad/s

 b. 6283 rad/s

 c. 62.83 rad/s

 POLYTECH

 d. 628.3 rad/s

 e. 6.283 rad/s

A certain circuit has equivalent impedance Z = 8+j4 Ω, and an applied voltage 42.5 cos( 1000t + 30°)

The power factor is:

 Select one:

 a 0.45

 b 0.8

 c 0.89

 d 0.32

 e 0.6

Design a sequential circuit by using JK-flip flop which can detect a sequence of three or more consecutive 1’s in a string of bits coming through an input line.