Electric Drives Practice Test 4

1. Calculate the value of the duty cycle if the system is on for 1 sec and off for inf sec.

2. The unit of area is m².

3. Calculate the time period of the waveform y(t)=sin(.1πt)+cos(.2πt).

4. Calculate the active power in a 56 F capacitor.

5. Regenerative is the best electrical braking among all braking techniques.

6. Calculate the minimum value of the active power in the cylindrical rotor synchronous machine? (E_b represents armature emf, V_t represents terminal voltage, δ represents rotor angle, X represents reactance)

7. A 2-pole, 3-phase, ______ Hz induction motor is operating at a speed of 550 rpm. The frequency of the rotor current of the motor in Hz is 2.

8. Zero voltage regulation can be only achieved in leading power factor load.

9. Calculate the value of the angular acceleration of the motor using the given data: J = .1 kg-m², load torque = 45 N-m, motor torque = 55 N-m.

10. Calculate the value of resistance if total heat dissipated is 78 W when 5 A current flows through it.