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Yash Garg

Yash G.

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Questions asked

INSTANT ANSWER

What should be the radius of a capillary tube if water has to rise to a height of 6 cm in it, if surface tension of water is 7.2 x 10?2 Nm?1

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INSTANT ANSWER

The Mariana trench is located in the Pacific Ocean, and at one place it is nearly 11Km beneath the surface of water. The water pressure at the bottom of the trench is about 1.1×108Pa . A steel ball of initial volume 0.32m3 is dropped into the ocean and falls to the bottom of the trench. What is the change in the volume of the ball when it reaches to the bottom?

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INSTANT ANSWER

Determine the volume contraction of a solid copper cube, 10 cm on an edge, when subjected to a hydraulic pressure of 7.0×106Pa. (Bulk modulus of copper, B=140×109Pa)

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INSTANT ANSWER

Calculate the work done in blowing a soap bubble of diameter 0.6 cm. against the surface tension force. (Surface tension of soap solution =2.5 times 10^-2 Nm^-1)

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ANSWERED

Krishna J verified

Numerade educator

A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is (a) 20% (b) 40% (c) 70% (d) 90%

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ANSWERED

Krishna J verified

Numerade educator

An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the ac is 28 V. The r.m.s. secondary voltage is nearest to (a) 50 V (b) 70 V (c) 100 V (d) 40 V

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ANSWERED

Krishna J verified

Numerade educator

A loss free transformer has 500 turns on its primary winding and 2500 in secondary. The meters of the secondary indicate 200 volts at 8 amperes under these conditions. The voltage and current in the primary is (a) 100 V, 16 A (b) 40 V, 40 A (c) 160 V, 10 A (d) 80 V, 20 A

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ANSWERED

Krishna J verified

Numerade educator

A step-down transformer is connected to 2400 volts line and 80 amperes of current is found to flow in output load. The ratio of the turns in primary and secondary coil is 20 : 1. If transformer efficiency is 100%, then the current flowing in primary coil will be (a) 1600 A (b) 20 A (c) 4 A (d) 1.5 A

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ANSWERED

Krishna J verified

Numerade educator

The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are (a) 240 V, 5 A (b) 240 V, 10 A (c) 60 V, 20 A (d) 120 V, 20 A

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ANSWERED

Krishna J verified

Numerade educator

The ratio of secondary to the primary turns in a transformer is 3 : 2. If the power output be P, then the input power neglecting all loses must be equal to?

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