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SSC JE 2019-20 Technical Quiz 16

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Question 1

A power transistor has thermal resistance If the maximum junction temperature is 90oC and the ambient temperature is 30oC, a heat sink is used, the value of θ is reduced to 60oC/W. The new maximum permissible power dissipation is

Question 2

A battery of accumulators of e.m.f. 50 V and internal resistance Description: E:\Gate\SSC-JE Electrical - Part 1\10_Chemical-Effects-of-Electric-Current-final_files\image044.png is charged on a 100 V direct current mains. What series resistance will be required to give a charging current of 2 A?

Question 3

Which of the following materials when used as the viewing surface of a CRO gives a bluish glow?

Question 4

What is the percentage voltage error of a potential transformer with system voltage of 11,000 V and having turns ratio of 100, if the measured secondary side voltage is 105 V?

Question 5

The higher the voltage in the transmission line, the current which will flow through the transmission line for a given power to be transmitted will be

Question 6

LED lamp have a general life expectancy of

Question 7

Determine the energy (in J) stored by an 8 H inductor, if the current through the inductor is 4 A.

Question 8

A wire of 30 ohms resistance is stretched to double its original length and then cut into two equal parts. These two equal parts are connected in parallel with a battery that draws a current of 2 A. Determine the potential difference (in V) between the terminals of the battery.

Question 9

A d.c. shunt motor runs at no load speed of 1140 r.p.m. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full load speed in r.p.m. is

Question 10

A 1.8° step, 4-phase stepper motor has a total of 40 teeth on 8 pole of stator. The number of rotor teeth for their rotor will be
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Jul 3ESE & GATE EE