1. Which of the following is preferred for automatic drives?
a) Synchronous motors
b) Squirrel cage induction motor
c) Ward-Leonard Controlled dc motor
d) any of these
ans. c
2. Which type of drive can be used for hoisting machinery?
a) Slip ring induction motor
b) Ward Leonard controlled dc shunt motor
c) DC compound motor
d) any of these
ans. c
3. The motor normally used for crane is
a) Slip- ring induction motor
b) Ward Leonard Controlled DC shunt motor
c) Synchronous motor
d) DC differentially compound motor
ans. a
4. A wound rotor induction motor is preferred over squirrel cage induction motor when the major consideration involved is
a) high starting torque
b) low starting current
c) speed control over limited range
d) all of these
ans. d
5. When smooth and precise speed control over a wide range is desired, the motor preferred is
a) synchronous motor
b) squirrel cage induction motor
c) wound rotor induction motor
d) dc motor
ans. d
6. when quick speed reversal is a consideration the motor preferred as
a) synchronous motor
b) squirrel cage induction motor
c) wound rotor induction motor
d) dc motor
ans. d
7. DC supply can be obtained from AC supply by the use of
a) motor generator set
b) mercury arc rectifier
c) silicon diodes
d) any of these
ans. d
8. The selection of control gear for a particular application is based on the consideration of
a) duty
b) starting torque
c) limitations on starting current
d) all of these
ans. d
9. The consideration involved in the selection of the type of electric drive for a particular application depends on
a) speed control range and its nature
b) starting torque
c) environmental conditions
d) all of these
ans. d
10. As compared to squirrel cage induction motor a wound rotor induction motor is preferred when the major consideration is
a) high starting torque
b) low windage losses
c) slow speed operation
d) all of these
ans. a
