WorksheetsSOLID STATE DRIVES Quiz1
Total questions: 20
Worksheet time: 10mins
1. Which type of drive system is used in travelling cranes?
a. Group Drive
b. Individual Drive
c. Multimotor drive
d. DC drive
2. What is the best choice of drive type for lathe machine?
a. Group drive
b. Multimotor drive
c. Individual drive
d. AC drive
3. Which quadrant the reverse motoring is applicable?
a. I
b. II
c. III
d. IV
4. What is the torque equation of motor during acceleration?
a. Tm = TL
b. Tm > TL
c. Tm < TL
TL = 0
5.What is the condition for steady state stability of motor?
Tm = TL
Tm < TL
Tm > TL
Tm + J = TL
6. Examble for active torque is ----------
a. Deformation of Elastic body
a. Deformation of inelastic body
c. Friction force
d. Wintage torque
7. What is the better choice of motor drive is suitable for lift application?
a. DC Series motor
b. DC Shunt motor
c. DC Compound motor
d. Differential compound motor
8. Whis is the purpose of skewing in induction motor?
a. Reduce magnetic hum
b. Reduce oscillations
c. Reduce the harmonics
d. Reduce the starting torque
9. What is other name for frequency control of 3phase IM?
a. v/f control
b. Kramer's Drive
c. Rotor resistance control
d. Field weakening method
10. Slip power is -----------
a. Slip P airgap (SPag)
b. Slip
c. Pag
d. (1-S) Pag
11. Bidirectional flow of power is occurs in -----------
a. Static Kramers drive
b. Static Scherbius drive
c. Rotor resistance control
d. Chopper fed drive
12. A high starting torque is offered by the Belt Conveyors.
a. True
b. False
13. Calculate the frequency of the rotor side of the IM if the value of slip is 0.34 and the supply frequency is 70 Hz.
a.23.8 hz
b. 22.7
c. 24
d. 21.5
14. Full form of THD is ----
a. total harmonic diverter
b. total harmonic digital
c. total harmonic distortion
d. total harmonic discrete
15. What type of force handles for active torques?
a. strong nuclear forces
b. weak nuclear forces
c. gravitational forces
d. electrostatic forces
16. Choose the correct one. (* stands for multiplication, J represents the moment of inertia, w represents angular speed).
a. j*d(w)/dt = load torque – motor torque
b. j*d(w)/dt = load torque + motor torque
c. j*d(w)/dt = motor torque – load torque
d. j*d(w)/dt = load torque * motor torque
17. Which of the following is the best braking method?
a. friction
b. electromechanical action
c. eddy-currents
d. electric braking
18. Which of the following is dynamic braking?
a. reversal of field connections
b. reversal of armature connections
c. addition of equal and opposite field
d. removal of armature circuit from current machine circuit
19. An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 720 rpm. The frequency of the rotor current of the motor in Hz is
a. 3
b. 2
c. 1
d. 4
20. Which type of inverter type use feedback diodes?
a. CSI
b. VSI
c. Both VSI and CSI
d. only CSI
