An air cored toroidal coil has 450 turns, a mean diameter of 300 mm and a cross-sectional area of 300 mm². Determine the self-inductance of the coil.
A\(81 \times 10^{-4}\) H
B\(8.1 \times 10^{-4}\) H
C\(0.81 \times 10^{-4}\) H
D\(0.081 \times 10^{-4}\) H
#22📜 EE Pre-Board March 2017📘 PowerhouseEasy
The flux produced in the air gap between two electromagnetic pole faces is \(6 \times 10^{-2}\) Wb. The length of the air gap is 1.4 cm and the cross-sectional area of the gap is 0.3 m². Find the magnetic field intensity.
A\(153.2 \times 10^{3}\) AT/m
B\(155.2 \times 10^{3}\) AT/m
C\(157.2 \times 10^{3}\) AT/m
D\(159.2 \times 10^{3}\) AT/m
#23📜 EE Pre-Board August 2017📘 PowerhouseEasy
Two conductors carrying 50 amperes and 75 amperes respectively are placed 10 cm apart. Calculate the force between them per meter.
A0.075 N/m
B0.0375 N/m
C0.0075 N/m
D0.00375 N/m
#24📜 EE Pre-Board August 2017📘 PowerhouseEasy
Calculate the AT/m needed to produce a flux density of 0.001 Wb/m² at the center of a long straight solenoid.
A0.796
B79.6
C7,958
D796
#25📜 EE Pre-Board August 2017📘 PowerhouseMedium
An air core toroidal coil has 120 turns and a length of 12 cm. What current is required to set up a flux of \(1.2 \times 10^{-6}\) weber if the cross-sectional area is 12 square cm?
A7.96 A
B0.796 A
C0.0796 A
D1.59 A
#26📜 EE Pre-Board August 2017📘 PowerhouseEasy
A straight conductor 100 cm long and carrying 40 A lies perpendicular to a magnetic field of 1.5 T. What is the mechanical power in watts required to move the conductor at a uniform speed of 5 meters per second?
A60 W
B7.5 W
C200 W
D300 W
#27📜 EE Pre-Board March 2018📘 PowerhouseEasy
A magnetizing force of 1000 AT/m will produce a flux density of ___________ in air
A1.257 mWb/m²
B0.63 mWb/m²
C1.257 Wb/m²
D0.63 Wb/m²
#28📜 EE Pre-Board August 2018📘 PowerhouseEasy
Two similar poles, each of 1 Wb, placed 1 m apart in air will experience a repulsive force of _____.
