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A voltage source 𝑣(𝑡) = 240 sin(314.16𝑡 − 20°)𝑉 is connected to a load having an
impedance of Z. The resulting current through the load is 𝑖(𝑡) = 15 sin(314.16𝑡 + 22.5°)A.
Determine the circuit power factor and identify the elements that constitute the load, given
that Z comprises of only two elements connected in series.
Design an operational amplifier circuit to form the weighted sum V0 = – (2V1+V2).
A 10mV, 2KHz sinusoidal signal is applied to the input of an op-amp integrator for which R=100 kΩ and C=1 μF. Find the output voltage.
A JN flip-flop has two inputs J and N. Input J behaves like the J input of a JK flip-flop, and input N behaves like the complement of the K input of a JK flip-flop (that is N=K’).
(a) Obtain the characteristic table of the flip-flop.
(b) Show that, by connecting the two inputs J and N together, one obtains a D-type flip-flop.
A 228V constant potential generator delivers load to a variable impedance whose values of R and X
are readily adjustable. Assuming a looking-back impedance of (6+j4.5) ohms calculate, for maximum
power,
a. The load impedance
b. The current
c. Load power
d. power factor
In a mechanism as shown in Fig. 8.39, the link AB rotates with a uniform angular velocity of 30 rad/s. The lengths of various links are : A B = 100 mm ; BC = 300 mm ; BD = 150 mm ; DE = 250 mm ; EF = 200 mm ; DG = 165 mm.
Determine the velocity and acceleration of G for the given configuration.
In a four bar chain ABCD , link AD is fixed and the crank A B rotates at 10 radians per second clockwise. Lengths of the links are A B = 60 mm ; BC = CD = 70 mm ; DA = 120 mm. When angle DAB = 60° and both B and C lie on the same side of AD, find 1. angular velocities (magnitude and direction) of BC and CD ; and 2. angular acceleration of BC and CD.
In a pin jointed four bar mechanism ABCD, the lengths of various links are as follows:
A B = 25 mm ; BC = 87.5 mm ; CD = 50 mm and AD = 80 mm. The link AD is fixed and the angle BAD = 135°. If the velocity of B is 1.8 m/s in the clockwise direction, find 1. velocity and acceleration of the mid point of BC, and 2. angular velocity and angular acceleration of link CB and CD
The engine mechanism shown in Fig. 8.38 has crank OB = 50 mm and length of connecting rod A B = 225 mm. The centre of gravity of the rod is at G which is 75 mm from B. The engine speed is 200r.p.m. For the position shown, in which OB is turned 45° from O A, Find 1. the velocity of G and the angular velocity of A B, and 2. the acceleration of G and angular acceleration of A B.
An epicyclic train is shown in Fig. 13.42. Internal gear A is keyed to the driving shaft and has 30 teeth. Compound wheel C and D of 20 and 22 teeth respectively are free to rotate on the pin fixed to the arm P which is rigidly connected to the driven shaft. Internal gear B which has 32 teeth is fixed. If the driving shaft runs at 60 r.p.m. clockwise, determine the speed of the driven shaft. What is the direction of rotation of driven shaft with reference to driving shaft?
