# RRB JE ELECTRICAL QUIZ

**[1] Which of the subsequent can vary with ac, but never with dc? RRB JE ELECTRICAL QUIZ**

**Power****Voltage****Frequency****Amplitude**

**[2] If all other aspects are kept constant, the inductance of the air-core coil is not affected by RRB JE ELECTRICAL QUIZ**

**The frequency****The number of turns****The diameter of the coil****The length of the coil**

**[3] The length of time between a point in one cycle and the same point in the next cycle of an ac wave is the**

**Frequency****Magnitude****Period****Polarity**

**[4] Capacitance acts to store electrical energy as RRB JE ELECTRICAL QUIZ**

**Current****Voltage****A magnetic field****An electric field**

**[5] On a spectrum analyser, a ac signal having only one frequency component looks like RRB JE ELECTRICAL QUIZ**

**[5] On a spectrum analyser, a ac signal having only one frequency component looks like RRB JE ELECTRICAL QUIZ**

**single pip****sine wave****square wave**e**sawtooth wav**

**[6] A ferromagnetic core is placed in the inductor to RRB JE ELECTRICAL QUIZ**

**Increase the current carrying capacity****Increase the inductance****Limit the current****Reduce the inductance**

**[7] The period of an ac wave, in seconds is RRB JE ELECTRICAL QUIZ**

**The same as the frequency in hertz****Not related to the frequency in any way****Equal to 1 divided by the frequency in hertz****The Equal to the peak amplitude in volts divided by the frequency in hertz**

**[8] An inductor works by RRB JE ELECTRICAL QUIZ**

**[8] An inductor works by RRB JE ELECTRICAL QUIZ**

**Charging a piece of wire****Storing energy as a magnetic field****Choking off dc****Introducing resistance into a field**

**[9] As capacitor plate area upsurges RRB JE ELECTRICAL QUIZ**

**A capacitance increases****The capacitance decreases****A capacitance does not change****The current handling ability drops**

**[10] In a small inductance RRB JE ELECTRICAL QUIZ**

**Energy is stored and released slowly****The current flow is always large****The current flow is always slow****Energy is stored and released quickly**

**[11] In ac circuit, the ratio of kW/kVA is**

**power factor****form factor****load factor****diversity factor**

**[12] Suppose that two ac waves have the same frequency but differ in phase by exactly 1/20 of a cycle. What is the phase difference between these two waves?**

**[12] Suppose that two ac waves have the same frequency but differ in phase by exactly 1/20 of a cycle. What is the phase difference between these two waves?**

**18 deg****20 deg****36 deg****5.73 deg**

**[13] The unit of inductance is**

**Mho****hendry****ohm****farad**

**[14] What is the angular frequency of the ac signal having a frequency of 1770Hz**

**1770 rad/s****11,120 rad/s****282 rad/s****Data insufficient**

**[15] Thevenin’s equivalent circuit consists of**

**[15] Thevenin’s equivalent circuit consists of**

**series combination of Rth, Eth, Rl****series combination of Rth, Eth****parallel combination of Rth, Eth, Rl****parallel combination of Rth, Eth**

**[16] The frequency of DC supply is**

**16 2/3 Hz****60 Hz****50 Hz****0 Hz**

**[17] Load factor is defined as the ratio of**

**max demand/ average demand****average demand/ connected load****average demand/ max. demand****connected load/ max demand**

**[18] Q factor of an inductive coil is given by**

**2π fL/R****2π fr/R****R/Z****lr/l**

**[19] The RMS value of sinusoidal 100V peak to peak is**

**100 V****50/√2 V****50 V****100/√2 V**

**[20] Which of the following bulbs will have the least resistance?**

**220V, 60W****220V, 100W****115V, 60W****115V, 100W**