Which part of a motor needs maximum attention for maintenance ?
(A) Frame
(B) Rearing
(C) Stator winding
(D) Rotor winding
Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?
(A) Starting characteristics
(B) Operating speed
(C) Horse power
(D) Speed control
Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
(A) Light duty
(B) Medium duty
(C) Heavy duty
(D) All of the above
For a particular application the type of electric-and control gear are determined by which of the following considerations ?
(A) Starting torque
(B) Conditions of environment
(C) Limitation on starting current
(D) Speed control range and its nature
(D) All of the above
The load cycle for a motor driving a power press will be________________?
(A) variable load
(B) continuous
(C) continuous but periodical
(D) intermittent and variable load
Which of the following motors always starts on load ?
(A) Conveyor motor
(B) Floor mill motor
(C) Fan motor
(D) All of the above
While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?
(A) Running characteristics
(B) Starting characteristics
(C) Efficiency
(D) Braking
The selection of an electric motor for any application depends on which of the following factors ?
(A) Electrical characteristics
(B) Mechanical characteristics
(C) Size and rating of motors
(D) Cost
(D) All of the above
Reluctance motor is a________________?
(A) variable torque motor
(B) low torque variable speed motor
(C) self starting type synchronous motor
(D) low noise, slow speed motor
A reluctance motor_________________?
(A) is provided with slip rings
(B) requires starting gear
(C) has high cost
(D) is compact