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A step-up transformer works on 220V and gives 2A to an external resistor. The turn ratio between the secondary and primary coils is 2 : 25. Assuming 100% efficiency, Determine the Primary current, secondary voltage and power delivered.
Materials, which provide a path to the magnetic flux, are classified as (A) Insulating materials. (C) Magnetic materials. (B) Semi conducting materials. (D) Die
Neutron possesses: (1)Positive charge (2)Negative charge (3)No charge (4)All are correct Ans: (3)No charge
When a person stands on a scale in an elevator at rest, the scale reads 800 newtons. When the elevator is allowed to fall freely with acceleration of gravity, the scale reads o
Determine the Shear Force in kN rounded to 1 DP and Bending Moment in kN.m rounded to 1 DP at point C in the beam when the Uniformly Distributed Load (UDL) on AC is P51 kN/m and th
Lorentz Transformation: The postulate of STR is proposed by Einstein in 1905. The two postulates are: 1. Principle of equivalence: According to this "The laws of physics
In Bohr's theory of the atom, what force was responsible for holding the electrons in their orbit? Ans: Coulomb force or the force of attraction among the proton (nucleus) a
A ray of light travelling in air is incident on a prism and passes through it with a speed of 2X10 8 ms -1 parallel to its base. If the angle of refraction is similar to half of
Q. A capacitor blocks d.c. but allows a.c. Why? Capacitive reactance XC = 1/ω C = 1 / 2πν C Where ν is the frequency of the a.c. supply. In a d.c. circuit
Q. A transistor is connected in CE configuration. The voltage drop across the load resistance ( Rc) 3 k is 6 V. Find the base current. The current gain α of the transistor is 0.97.
VISUAL PHOTOMETRY: The branch of science which deals with measurement of brightness or luminous intensities of light emitted by different sources using certain standards and tech
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