A. purely D.C. control systems
B. purely AC. control systems
C. both D.C. and AC. control systems
D. none of the above
Related Mcqs:
- The mcrease in heat dissipation by air blasts is due to increase in______________?
A. conduction
B. convection
E. radiation
D. any ofthe above - The efficiency of a machine should be as ____________ as possible to reduce the operating cost?
A. high
B. low
C. either of the above
D. none of the above - impose limitation on design____________?
A. Saturation
B. Temperature rise
C. Efficiency
D. Power factor
E. All above - The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?
A. conduction
B. convection
C. radiation
D. any of the above - The resistivity of water should not be less than_____________?
A. 10 Q m
B. 100 Q m
C. 1000 Q m
D. 2000 Q m - Which of the following methods does not take into account the maximum temperature rise under variable load conditions ?
A. Equivalent power method
B. Equivalent current method
C. Method of average losses
D. Equivalent torque method - Dummy coil should not be used in_________________?
A. small machines
B. large machines
C. either A. or B.
D. none of the above - In a D.C. machine, the value of peripheral speed should not, normally, exceed___________?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s - In a D.C. machine the number of brush arms is _________ the number of poles?
A. less than
B. equal to
C. greater than
D. none of the above - The high voltage winding is usually which of the following type ?
A. Cylindrical winding with circular conductors
B. Cross-over winding with either circular or small rectangular conductors
C. Continuous disc type winding with rectangular conductors
D. All of the above types
