SSC JE / State Electricity Boards JE Electrical Exams QUIZ-1

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Question 1

The only disadvantage of field control method for controlling the speed of a d.c. shunt motor is that is

• Agives speeds lower than the normal speed
• Bis wasteful
• Cneeds a large rheostat
• Dadversely affects commutation

Question 2

If the load current and magnetic flux of a d.c. motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

• Aincrease by 5%
• Bdecrease by 5%
• Cremain unaltered
• Ddepend on other factors

Question 3

For very long high voltage transmission lines, the system of overcurrent protection used is

• Atime-graded protection
• Bpilot-wire system
• Cdistance protection
• Dnone of the above

Question 4

In a 33 kV overhead line, there are 3 units in the string of insulators. The voltage across the string is

• A

  

• B33 kV
• C66 kV
• Dnone of the above

Question 5

The current I in the circuit shown in the below figure is

       

• A-1 A
• B1 A
• C2 A
• D-2 A

Question 6

A rise in temperature is observed in a conductor by passing a current. When the current is doubled, the rise in temperature will be

• A
• B
• C
• D

Question 7

In Fig., and What is the value of

• A
• B
• C
• D

Question 8

The mutual inductance between two coils with coupling coefficient of 0.85 having self inductances 3H and 12H respectively will be_____

• A12.75H
• B5.1H
• C0.425H
• D1.7H

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