[{"id":111053,"question":"The bridge circuit of full wave rectification uses","choices":[{"text":"one diode","value":"A"},{"text":"two diode","value":"B"},{"text":"three diode","value":"C"},{"text":"four diode","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111051,"question":"In half wave rectification","choices":[{"text":"both halves of the input voltage is used","value":"A"},{"text":"only one half of the input voltage is used","value":"B"},{"text":"either of these","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111050,"question":"During the negative half-cycle of the half-wave rectification, the diode","choices":[{"text":"does not conduct","value":"A"},{"text":"conducts","value":"B"},{"text":"either of these","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111048,"question":"During the positive half-cycle in the half-wave rectification,the diode","choices":[{"text":"does not conduct","value":"A"},{"text":"conducts","value":"B"},{"text":"either of these","value":"C"},{"text":"neither of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111045,"question":"The output voltage of half wave rectification is in the form of","choices":[{"text":"a smooth curve","value":"A"},{"text":"a smooth wave","value":"B"},{"text":"pulses","value":"C"},{"text":"all of the above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111043,"question":"Conversion of alternating current into direct current is called","choices":[{"text":"amplification","value":"A"},{"text":"rectification","value":"B"},{"text":"conduction","value":"C"},{"text":"polarization","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111042,"question":"A diode characteristic curve is a plot between","choices":[{"text":"current and time","value":"A"},{"text":"voltage and time","value":"B"},{"text":"voltage and current","value":"C"},{"text":"forward voltage and reversed voltage","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111040,"question":"When the pn-junction is connected reversed biased, its resistance is of the order of","choices":[{"text":"few ohms","value":"A"},{"text":"few kilo-ohms","value":"B"},{"text":"few mega-ohms","value":"C"},{"text":"few mili-ohms","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111037,"question":"When the pn-junction is in reversed biased, current flows through the junction due to the","choices":[{"text":"majority carriers","value":"A"},{"text":"minority carriers","value":"B"},{"text":"either of them","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111035,"question":"When the pn-junction is forward biased. the current flows through it is of the order of","choices":[{"text":"mili-amperes","value":"A"},{"text":"amperes","value":"B"},{"text":"nano-amperes","value":"C"},{"text":"micro-amperes","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111034,"question":"When the p-n junction is forward biased its resistance is of the order of","choices":[{"text":"few mega ohms","value":"A"},{"text":"few kilo ohms","value":"B"},{"text":"few ohms","value":"C"},{"text":"few milli ohms","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111033,"question":"The value of the potential difference across the depletion region for the case of germanium is","choices":[{"text":"0.3 V","value":"A"},{"text":"0.5 V","value":"B"},{"text":"0.7 V","value":"C"},{"text":"0.9 V","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111032,"question":"A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from","choices":[{"text":"2nd group","value":"A"},{"text":"fourth group","value":"B"},{"text":"fifth group","value":"C"},{"text":"sixth group","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111030,"question":"Average value of A.C voltage during one cycle is","choices":[{"text":"1","value":"A"},{"text":"Zero","value":"B"},{"text":"Maximum","value":"C"},{"text":"Variable","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111029,"question":"A changing magnetic flux creates around itself","choices":[{"text":"An electromotive force","value":"A"},{"text":"An electric field (changing electric flux)","value":"B"},{"text":"Magnetic field","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111028,"question":"When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency","choices":[{"text":"9.4 kHz","value":"A"},{"text":"940 kHz","value":"B"},{"text":"94 kHz","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111026,"question":"In free space, the speed of electromagnetic waves is","choices":[{"text":"3 x 10<sup>8</sup>ms<sup>-1</sup>","value":"A"},{"text":"3 x 10<sup>6</sup>ms<sup>-1</sup>","value":"B"},{"text":"4 x 10<sup>7</sup>ms<sup>-1</sup>","value":"C"},{"text":"3 x 10<sup>9</sup>ms<sup>-1</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111024,"question":"Transmitting antenna emits","choices":[{"text":"Magnetic waves","value":"A"},{"text":"Electric waves","value":"B"},{"text":"Electromagnetic waves","value":"C"},{"text":"Sound waves","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111023,"question":"Electromagnetic waves transmit energy equal to","choices":[{"text":"1/2 mv<sup>2</sup>","value":"A"},{"text":"m<sub>o</sub>c<sup>2</sup>","value":"B"},{"text":"hf/c","value":"C"},{"text":"hf","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111022,"question":"Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length","choices":[{"text":"X-rays","value":"A"},{"text":"Ultraviolet rays","value":"B"},{"text":"y-rays","value":"C"},{"text":"Cosmic rays","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111021,"question":"Chock consumes externally small","choices":[{"text":"Charge","value":"A"},{"text":"Current","value":"B"},{"text":"Power","value":"C"},{"text":"Potential","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111020,"question":"Which one of the following waves belongs to electromagnetic spectrum","choices":[{"text":"Radio and TV waves","value":"A"},{"text":"Radar waves","value":"B"},{"text":"Micro waves","value":"C"},{"text":"All of them","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111019,"question":"In frequency modulation (FM), the carrier waves amplitude","choices":[{"text":"Remains constant","value":"A"},{"text":"Increase","value":"B"},{"text":"Decreases","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111017,"question":"If the value of C in a series RLC circuit is increased, the resonant frequency","choices":[{"text":"Is not affected","value":"A"},{"text":"Increase","value":"B"},{"text":"Remains the same","value":"C"},{"text":"Decreases","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111016,"question":"The phase angle of a series RLC circuit at resonance is","choices":[{"text":"180<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"A"},{"text":"90<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"B"},{"text":"0<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"C"},{"text":"None of the these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111015,"question":"The total reactance of a series RLC circuit at resonance is","choices":[{"text":"zero","value":"A"},{"text":"Equal to the resistance","value":"B"},{"text":"Infinity","value":"C"},{"text":"Capacitive","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111014,"question":"SI unit of impedance is","choices":[{"text":"hertz","value":"A"},{"text":"henry","value":"B"},{"text":"ampere","value":"C"},{"text":"ohms","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111013,"question":"In series RC circuit when R=X<sub>c</sub>, then the phase angle is","choices":[{"text":"0<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"A"},{"text":"90<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"B"},{"text":"70<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"C"},{"text":"45<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111012,"question":"An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Does not change","value":"C"},{"text":"Momentarily goes to zero","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111009,"question":"At resonance frequency the impedance of parallel resonance circuit is","choices":[{"text":"Maximum","value":"A"},{"text":"Minimum","value":"B"},{"text":"Zero","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":1}]