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Explain Rolling
Rolling: A pair of cylindrical rollers made of iron or steel rotate in opposite direction with a gap between them which is smaller than the cross section of the piece which is to be rolled. The work piece is inserting into the gap and as it passes among the rolls, it is squeezed, its cross section being progressively reduced. As the working volume remains constant, the result of passing by the rolls would be lengthening of the work piece and a corresponding decrease and shaping of the cross section. ling and Forging
é How many types of breakdown ?
describe the construction and working of a Nicol prism.discuss how you obtain a plane polarised beam with it?
In a Wheatstone bridge ABCD, a galvanometer is connected between A and C, and a battery among B and D. A resistor of unknown value is connected among A and B. When the bridg
A two farad and a four farad capacitor are connected in series. What single capacitance is "equivalent" to this combination? A 2-farad and a 4-farad capacitor are connected in
Q. When the negative feedback is practical to an amplifier of gain 50 the gain falls to 25. Compute the feedback ratio? Af = A / 1 + Aβ 25 = 50 / 1 + 50 β 1 = 2 / 1 + 50
Production of sound messages by a microphone in a radio station (studio). 1) Audio frequency generation. 2) Generation of r.f. carrier wave. 3) Modulation in a transmitter, b) 4
Can several fibers gives the same amount of light? No, some fibers do not give similar amount of light. If a no. of fibers or light guides are coupled similar illuminator, this
As a pendulum is raised to higher altitudes, its period: a) Increases b) Decreases c) Remains the same d) Decreases, and then remains the same Ans: When
An infinitely long wire carries a current of three amps. The magnetic field outside the wire: a) Points radially away from the wire b) Points radially inward c) Circ
Red light (λ = 685 nm) falls on a slit that is 0.025 mm wide. The distance between the centers of the central bright band and the second-order dark band is 6.3 cm. What is
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