The thermal conductivity of hydrogen is _____________ times that of air?
The thermal conductivity of hydrogen is _____________ times that of air?
A. 2
B. 3
C. 5
D. 7
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The design of mechanical parts is particularly important in case of __________ speed machines?
The design of mechanical parts is particularly important in case of __________ speed machines?A. low
B. medium
C. high
D. any of the aboveIn D.C. machines the width of the duct is usually_____________?
In D.C. machines the width of the duct is usually_____________?A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mmThe high voltage winding is usually which of the following type ?
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 typesWhich of the following is the basic consideration in the design of insulation ?
Which of the following is the basic consideration in the design of insulation ?A. Electrical considerations
B. Mechanical considerations
C. Thermal considerations
D. All of the aboveThe heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?
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____________are used for construction of core of electromagnets?
____________are used for construction of core of electromagnets?A. Soft magnetic materials
B. Hard magnetic materials
C. Either A. or B.
D. None of the above