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SSC JE 2019-20 Technical Quiz 59

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Question 1

In heating the ferro-magnetic materials by induction heating, heat is produced owing to

Question 2

A series battery of 12 lead acid accumulators, each of e.m.f. 2 V and internal resistance Description: E:\Gate\SSC-JE Electrical - Part 1\10_Chemical-Effects-of-Electric-Current-final_files\image101.png is to be charged from 240 V d.c. If the charging current is not to exceed 3 A, what is the value of series resistance required?

Question 3

Two voltameters, one of silver and another of trivalent aluminium are connected in series. The ratio of number of silver atoms and the number of aluminium atoms deposited during time is

Question 4

A 200 W, 230 V, 50 Hz capacitor-start motor has the following winding parameters:

What should be the capacitance of the starting capacitor that will result in the maximum starting torque?

Question 5

In three induction motor maximum torque is inversely proportional to the

Question 6

In a split motor

Question 7

The field system of an alternator is generally excited at

Question 8

A 50 kVA, 500 V, single phase a.c. generator gave the following test results:
Open circuit test: A field current of 12 A produced an e.m.f. of 300 V.
Short circuit test: A field current of 12 A caused a current of 175 A to flow in the short-circuited armature.
The synchronous impedance of the generator is

Question 9

What is the effect produced by the electric current in an electric motor?

Question 10

The function of the commutator in a DC machine is ___________.
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