Search & Filtering
a block of iron mass 60kg must be heated from 20 degrees Celsius to 300 degrees Celsius. the specific heat capacity of iron is470J/kg k. the effeciencyof the system is 71%. the available supply voltage is. 230V. the process must be completed within 2 hours. if electricity from eskom is presentlyR1, 77 kilometers per hour. determine the value of current drawn from the source and the total cost of the process
the rod has a diameter of 15mm and 30 cm long. the thickness of the gold layer should be 0.2mm. the electromechanical equivalent of gold is 1.118 mg and density of gold is19300 kg/m^3. if the current process is executed with a current of 130A how long will it take to complete
The metal bar is AB =10mm, DA=18mm, BC =220cm and the resistivity of the metal is 0,012 micro ohms. what is its tip to tip resistance
Design a sequential circuit with two D flip-flops A and B, one input x, and one output y. When x = 0, the state of the circuit remains the same with output y=1. When x = 1, the circuit goes through the state transitions with output y=0. The state transitions from 00 to 01, to 11, to 10, back to 00, and repeats.
Design a sequence detector by using JK flip-flops. The sequence detector has one input x and one output y.
1101 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.
The rotor impedance of a three-phase, 50 Hz, 1460 rpm, star-connected ring ASM is (0.1+J1.5) Ω and the stator impedance (0.22+J0.35)Ω . With the rotor at rest, the voltage measured between the rings is 90 V. Wind and friction losses of the motor are 350 W. Accordingly, find the copper losses in the rotor when the motor is running at full load.
Design a sequential circuit with two D flip-flops A and B, one input x, and one output y. When x = 0, the state of the circuit remains the same with output y=1. When x = 1, the circuit goes through the state transitions with output y=0. The state transitions from 00 to 01, to 11, to 10, back to 00, and repeats.
IN Resonance circuit If L=6H, C= 7 mF,
angular resonance frequency (ws) is:
Select one:
a. ws= 5.8 rad/sec
b. ws= 4.88 rad/sec
C. ws= 6.8 rad/sec NIC
d. ws = 8.9 rad/sec
A three-phase system has an effective line
voltage of 240 V, and is connected to a
balanced delta load which draws 5 kW at a
power factor of 0.8, then the line current is:
Select one:
a. 13.88 A
b. 16.4 A
c. 12.89 A
d. 15.04 A
e. 12.03 A
For high-pass active filter with corner
frequency 8 kHz, then R and C are:
Select one:
a. 2.5 k Ω , 7.9557 nF
b. 2 k Ω , 7.9557 nF
c. 5 k Ω , 7:9557 nF nF
d. 10 k Ω , 7.9557 nF
e. 1 k Ω ,7.9557 nF
