A. 1.5
B. 2.5
C. 3.5
D. 4.5
Hydrogen has a heat transfer co-efficient __________ times that of air? Read More »
Electrical Machine Design A. 10 MW
B. 30 MW
C. 60 MW
D. 150 MW
A. conduction
B. convection
E. radiation
D. any ofthe above
The mcrease in heat dissipation by air blasts is due to increase in______________? Read More »
Electrical Machine Design A. Power density
B. Temperature difference between heated surface and coolant
C. Thermal resistivity, density, specific heat
D. Gravitational constant
E. All of the above
On which of the following variables heat convected depends ? Read More »
Electrical Machine Design A. Copper
B. Aluminium
C. Steel
D. Cast-iron
A. conduction
B. convection
C. radiation
D. any of the above
A. Grey cast-iron
B. Cast steel
C. High carbon steel
D. Stainless steel
A. small size
B. medium size
C. large size
D. any of the above size
A. zero
B. low
C. high
D. none of the above
Hot rolled sheets have ___________ value of permeability? Read More »
Electrical Machine Design A. conductors
B. semiconductors
C. insulators
D. superconductors
Materials exhibiting zero value of resistivity are known as ____________ ? Read More »
Electrical Machine Design