# Karnataka Power Transmission Corporation Limited (KPTCL) AE ELECTRICAL EXAM 2017 PRACTICE SET WITH ANSWER

 1) Which of the following does not have a commutator? A) Dynamo B) Induction motor C) Universal motor D) None of these Correct Answer: B 2) Which of the following is true with a series circuit having resistors of different values? A) The total resistance of the circuit is the sum of the individual resistances B) The current across each resistor is the same C) The voltage drop across each resistor depends on the value of the resistor D) All the above Correct Answer: D 3) The electric field inside a hollow conducting sphere A) Depends on the diameter of the sphere B) Varies according to the direction of earth’s magnetic poles C) Is zero D) None of these Correct Answer: C 4) Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these Correct Answer: B 5) The iron alloy, ALNICO is mainly used to make _ A) Temporary magnets B) Permanent magnets C) Transmission lines D) None of these Correct Answer: B 6) The magnetic permeability of a diamagnet is A) More than that of vacuum B) Same as that of vacuum C) Less than that of vacuum D) 3.14 times that of vacuum Correct Answer: C 7) Which of the following waveforms has the lowest form factor? A) Sine wave B) Square wave C) Sawtooth wave D) Triangle wave Correct Answer: B 8) Which of the following has the lowest electrical conductivity? A) Mercury B) Silver C) Copper D) Gold Correct Answer: A 9) What is the electrical charge of one proton? A) 1.602 x 10-19  C B) 1.602 x 10-12  C C) 1.602 x 10-10  C D) None of these Correct Answer: A

 10) Consider a circuit with four 10 Ω resistors connected in parallel and the current flowing through the circuit is 5 A. What will be the current if the above 4 resistors are connected in parallel? A) 5 A B) 50 A C) 500 A D) None of these Correct Answer: C 11) Drift velocity depends on A) Electron mobility B) Electric field C) Both A and B D) None of these Correct Answer: C 12) The process of removing the unwanted magnetism is called A) Unmagnetization B) Degaussing C) Diamagnetization D) Depoling Correct Answer: B 13) Which of the following is the name given to the lines of electric force which move so that its beginning traces a closed curve on a positive surface and its end traces a corresponding closed curve on the negative surface? A) Tube of surface B) Tube of lines C) Tube of force D) Tube of electricity Correct Answer: C 14) Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these Correct Answer: C 15) What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these Correct Answer: B 16) A neodymium magnet is a permanent magnet made from an alloy of A) Neodymium and iron B) Neodymium, iron and iodine C) Neodymium and boron D) Neodymium, iron and boron Correct Answer: D 17) Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these Correct Answer: C
 18) What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these Correct Answer: A 19) When three resistors with unequal values are connected in parallel, A) The current across the resistors is the same B) The voltage drop across the resistors is the same C) The voltage drops across the resistors is proportional to the resistance of each resistor D) None of these Correct Answer: B 20) What is the percentage error when 3 resistors with ratings 100 Ω at 5%, 150 Ω at 6% and 250 Ω at 8% respectively, are connected in series? A) 6.33% B) 6.80% C) 19% D) None of these Correct Answer: B 21) Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these Correct Answer: B 22) What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 µΩ-cm? A) 3.2 Ω B) 3.2 µΩ C) 0.8 Ω D) None of these Correct Answer: A 23) Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these Correct Answer: C 24) Which of the following has nearly zero temperature coefficient? A) Constantan B) Manganin C) Both A and B D) None of these Correct Answer: C

 25) What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled? A) It doubles B) It becomes 4 times C) It becomes 2π times D) It remains the same Correct Answer: D 26) What is the capacitance when a capacitor passes a current of 31.43 mA when supplied with 40 V AC with a frequency of 1000 Hz? A) 0.125 F B) 0.125 µF C) 1257.2 µF D) None of these Correct Answer: B 27) What is the stored energy when 200 V is applied across a 7 µF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these Correct Answer: C 28) What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 µF and 10 µF, connected in series? A) 500 µC B) 0.5 µC C) 0.5 C D) None of these Correct Answer: A 29) The ability of materials to become polarized under an applied electric field is called A) Ferroelectricity B) Paraelectricity C) Polectricity D) None of these Correct Answer: B 30) What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero Correct Answer: A 31) Which of the following batteries is rechargeable? A) Leclanche cell B) Zinc–carbon cell C) Bunsen cell D) None of these Correct Answer: D 32) In a battery, the difference between the no-load voltage and the measured voltage output is called A) Internal voltage B) Internal resistance C) External resistance D) All the above Correct Answer: B

 33) The mass of ions in grams which is liberated or deposited by chemical action by the passage of 1 C of electricity A) electrochemical force B) electrochemical voltage C) electrochemical equivalent D) none of these Correct Answer: C 34) The current flow in a battery is due to A) movement of ions B) movement of protons C) movement of holes D) movement of neutrons Correct Answer: A 35) When the phase difference between two sinusoidal quantities is 90° they are said to be A) Phase right angle B) Phase quadrature C) Phase sinuright D) None of these Correct Answer: B 36) What is crest factor (peak factor)? A) It is the ratio of the maximum amplitude to average value B) It is the ratio of the average amplitude and RMS value C) It is the ratio of the maximum amplitude to RMS value D) None of these Correct Answer: C 37) Which of the following is true at resonance in LC circuits? A) The series impedance of the two elements is at a maximum and the parallel impedance is at minimum B) The series impedance of the two elements is at a maximum and the parallel impedance is also at maximum C) The series impedance of the two elements is at a minimum and the parallel impedance is also at minimum D) The series impedance of the two elements is at a minimum and the parallel impedance is at maximum Correct Answer: D 38) A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these Correct Answer: C 39) What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these Correct Answer: B