A. Lower cost
B. Better efficiency
C. High power factor
D. All of the above
Related Mcqs:
- In case of _______________ speed control by injecting e.m.f. in the rotor circuit is possible?
A. d.c. shunt motor
B. schrage motor
C. synchronous motor
D. slip ring induction motor - The diameter of the rotor shaft for an electric motor depends on which of the following ?
A. r.p.m. only
B. Horse power only
C. Horse power and r.p.m.
D. Horse power, r.p.m. and power factor - ________________ motor is a constant speed motor?
A. Synchronous motor
B. Schrage motor
C. Induction motor
D. Universal motor - In a paper mill where constant speed is required________________?
A. synchronous motors are preferred
B. A.C. motors are preferred
C. individual drive is preferred
D. group drive is preferred - Rotor of a motor is usually supported on ___________________ bearings?
A. ball or roller
B. needle
C. bush
D. thrust - A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
A. slop speed operation
B. high starting torque
C. low windage losses
D. all of the above - An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?
A. 150msec-1
B. 384msec-1
C. 38.4msec-1
D. 200msec-1 - When the load is above _______________ a synchronous motor is found to be more economical?
A. 2 kW
B. 20 kW
C. 50 kW
D. 100 kW - Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________?
A. TTLAS
B. CMOS
C. ECL
D. TTLLS - Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. Squirrel cage induction motor
B. Wound rotor induction motor
E. Synchronous motor
D. D.C. motor
