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question_answer1) Directions (Q. Nos. 1 - 12): In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R) Mark the correct choice as. Assertion (A): An alternating current does not show any magnetic effect. Reason (R): Alternating current changes direction with time.
question_answer2) Assertion (A): Capacitor blocks dc and allows ac to pass. Reason (R): Capacitive reactance is inversely proportional to frequency.
question_answer3) Assertion (A): Vs value of an alternating voltage V = 4\[\sqrt{2}\] sin 314t is 4 volt. Reason (R): Peak value of the alternating voltage is 4\[\sqrt{2}\] volt.
question_answer4) Assertion (A): Both ac and dc can be measured by hot wire instrument. Reason (R): Hot wire instrument is based on the principal of magnetic effect of current
question_answer5) Assertion (A): The dimension of L/R is time. Reason (R): Time constant (UR) should be increased to reduce the rate of increase of current through a solenoid.
question_answer6) Assertion (A): At resonance, the current becomes minimum in a series LCR circuit. Reason (R): At resonance, voltage and current are out of phase in a series LCR circuit.
question_answer7) Assertion (A): When capacitive reactance is less than the inductive reactance in a series LCR circuit, e.m.f. leads the current. Reason (R): The angle by which alternating voltage leads the alternating current in series RLC circuit is given by tan \[\varphi =\frac{{{\operatorname{X}}_{L}}-{{X}_{C}}}{\operatorname{R}}\].
question_answer8) Assertion (A): Quality factor of a series LCR circuit is \[\operatorname{Q}=\frac{1}{\operatorname{R}}\sqrt{\frac{L}{C}}\] Reason (R): As bandwidth decreases, Q increases in a resonant LCR circuit.
question_answer9) Assertion (A): Principle of operation of AC generator is electromagnetic induction. Reason (R): Resistance offered by inductor for AC is zero.
question_answer10) Assertion (A): An alternator is a machine which converts mechanical energy into electrical energy Reason (R): When a coil rotates in a magnetic field an e.m.f. is induced in it.
question_answer11) Assertion (A): A transformer does not work on DC Reason (R): DC neither change direction nor magnitude.
question_answer12) Assertion (A): A step-up transformer converts input low AC voltage to output high AC voltage Reason (R): it violate the law of conservation of energy.
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