Test Details

Alternative Current

Test-5

Oct 26, 6:00 PM

60 minutes

Oct 26, 7:00 PM

30.0 marks

MCQ

30 questions

Dharmendra prasad

Given your background, you could offer Prasad Master Classes focusing on preparing students for JEE Mains and NEET examinations. Here's how you might structure your classes: Curriculum Design: Comprehensive coverage of Class 11 and 12 Physics syllabus. Emphasis on topics frequently tested in JEE Mains and NEET. Teaching Methodology: Conceptual understanding with real-life examples. Problem-solving techniques and shortcuts. Regular quizzes and mock tests to track progress. Resource Material:

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Question Text

Question 1 :
What do we name the  device which increases the emf ?

Question 2 :
In an ac circuit with voltage V and current I, the power dissipated is

Question 5 :
Turn ratio in a setup transformer is 1: 2.If a lechlanche cell of 1.5 V is connected across the input, what is the voltage across the output?

Question 6 :
Assertion: A step up transformer can also be used as a step down transformer. Reason: This is because $$\cfrac { { E }_{ p } }{ { E }_{ s } } =\cfrac { { n }_{ s } }{ { n }_{ p } } $$

Question 8 :
The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux linked with the primary coil is given by $$\phi =\phi _{0}+4t,$$ where $$\phi$$ is in webers, t is time in seconds and $$\phi_{0}$$ is a constant, the output voltage across the secondary coil is:

Question 9 :
A circuit has a self-inductance of $$1H$$ and carries a current of $$2A$$. To prevent sparking, when the circuit is switched off, a capacitor which can withstand $$400\ V$$ is used. The least capacitance of the capacitor connected across the switch must be equal to

Question 11 :
Match the following a) step up transformer     d) turns ratio is 1 b) step down transformer e) Ns > Np c) Ideal transformer           f) Np > Ns

Question 13 :
In a transformer, the number of turns of primary coiland secondary coil are 5 and 4 respectively. If 220V is applied on the primary coil, then the ratio ofprimary current to the secondary current is :

Question 14 :
In an oscillating LC circuit the maximum charge on the capacitor is $$Q$$. The charge on capacitor when the energy is stored equally between electric and magnetic field is :

Question 16 :
The number of turns in primary and secondary coils of a transformer is 50 and 200 respectively. If the current in the primary coil is 4A, then the current in the secondary coil is :

Question 17 :
$$Transformer \rightarrow ideal \rightarrow E_{P} = 1000\ V, I_{P} = 50A$$ $$220V \rightarrow 80\ houses$$ Resistance of secondary coil will be

Question 18 :
An ideal transformer has 500 and 5000 turns inprimary and secondary winding respectively. If theprimary coil is connected to a 6 V battery then thesecondary voltage is :

Question 19 :
A transformer is used to light a $$120 W$$,$$24 V$$lamp from$$240 V$$a.c. mains. The current in the main cableis$$0.6 A$$.The efficiency of the transformer is

Question 20 :
The ratio between the primary voltage and the secondary voltage in a transformer is equal to:

Question 21 :
In an ideal parallel LC circuit, the capacitor is charged by connecting it to a DC source which is then disconnected. The current in the circuit

Question 22 :
A device that increases the voltage of an alternating current is called a(n)

Question 23 :
A certain series resonant circuit has a bandwidth of $$2 kHz$$. If the existing coil is replaced with one having a higher value of $$Q$$, the bandwidth will

Question 24 :
A step up transformer converts $$100$$ V at primary to $$300$$ V at secondary.  If the primary current is $$6$$A, then the secondary current is ______A

Question 25 :
A transformer having $$4000$$ turns on its primary side and $$500$$ turns on the secondary side. If the input voltage is $$240\ V$$, find out the output voltage of the secondary side of the transformer ?

Question 27 :
In a $$LC$$ circuit. Angular frequency at resonance is $$w$$. What will be the new angular frequency when inductor's introduces is made $$2$$ times and capacitance is made $$4$$ times?

Question 28 :
The current which does not contribute to the power consumed in an AC circuit is called:

Question 29 :
Thesharpness of resonance in a series $$L-C-R$$ resonantcircuit,as the resistance of the circuit is increased,goeson

Question 30 :
For L-C-R, A.C circuit resonance frequency is $$600Hz$$ and frequencies at half power points are $$550Hz$$ and $$650Hz$$. What will be the Q-factor?

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