1. A 220V shunt connected dc
machine has an armature resistanc of 0.5 Ω and shunt field
resistance of 110 Ω . If the full load line current is 20 A, Find the induced
emf when the machine works as generator and motor.
2. The
rotor coppe loss of a 3 phase induction motor is 300 W. For a slip of 4%
calculate the electrical power converted in mechanical power.
3.Draw
the circuit diagram of a DC-DC converter (class E chopper) for four quadrant control
of dc motor drive and mark on it the feedback and freewheeling diode.
4. Draw
the circuit diagram of a single phase AC-DC dual converter for DC motor drive.
5. Find
V0 in the following:
6. Assume the diode ideal, Find input (Vi)-output(V0) relationship for the following circuit :
7. Find
Ammeter and Voltmeter reading in the following circuit:
8. Find
the value of V0 in the following circuit:
9. In
the following NMOS,Id = 80μA, Vt=0.6V, Kn =200μA/V,
L=0.8μm and W=4μ.Find the value of R neglecting channel length and modulation effect .
10. Determine
thevenin’s equivalent circuit with respect to a-b terminals.
11. A
system is described by differential equation
Where x is input and y is output. Find the expression of Y(s)/X(s). (Assume zero initial condition)
12. The pole zero plot of a system is shown. If the steady state
gain is 3, Find the transfer function of the system.
13. Find ζ , ωn,Tp,Ts
and % OS for a step input:
14. Find
the value of K for critical damping.
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