A magnetic circuit requires 800 AT to produce a certain quantity of flux in a magnetic circuit. If its excitation coil has 100 turns and 5 Ohm resistance, the voltage to be applied in exciting coil is 60 V. 80 V. 8 V. 40 V. TRUE ANSWER : ? YOUR ANSWER : ?
Magnetic field intensity at centre of circular coil, of diameter 1 m and carrying a current of 2 A is 1 A/m. 4 A/m. 2 A/m. 8 A/m. TRUE ANSWER : ? YOUR ANSWER : ?
The frequency range for satellite communication is 300 to 3000 kHz 3000 to 30000 MHz 30000 to 300000 MHz 3 to 30 kHz TRUE ANSWER : ? YOUR ANSWER : ?
An insulated metal sphere of 20 cm diameter is charged by rubbing with charges 2 × 10-8 C. Potential developed will be 0 V. 200 V. 1800 V. 900 V. TRUE ANSWER : ? YOUR ANSWER : ?
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then it is a perfect transformer. none of these. transformer is an ideal transformer. turns ratio of the transformer is also two. TRUE ANSWER : ? YOUR ANSWER : ?
The energy stored in the magnetic field in a solenoid 10 cm long and 4 cm diameter wound with 2000 turns of wire carrying a current at 20 amp, is 24 joules. 15 joules. 12 joules. 30 joules. TRUE ANSWER : ? YOUR ANSWER : ?
For a linear electromagnetic circuit, which of the following statement is true? Field energy is lesser than the co-energy. Co-energy is zero. Field energy is equal to the co-energy. Field energy is greater than the co-energy. TRUE ANSWER : ? YOUR ANSWER : ?
A sphere of radius with a uniform charge density ρv C/m3 shall have electric flux density at radius “r = a” equal to aρv C/m2. ρv/3 C/m2. aρv/4 C/m2. aρv/3 C/m2. TRUE ANSWER : ? YOUR ANSWER : ?
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as A = sinφ Ir. A = cosφ Ir + sinφ Iφ. A = cosφ Ir. A = cosφ Ir - sinφ Ir. TRUE ANSWER : ? YOUR ANSWER : ?
What is the value of total electric flux coming out of a closed surface? Zero. Equal to the surface charge density. Equal to total charge enclosed by the surface. Equal to volume change density. TRUE ANSWER : ? YOUR ANSWER : ?