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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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 7 views

Resistance of a copper wire decreases when ......................increases

asked May 14, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

If Poisson's ratio of a resistance wire strain gauge is 1.8, then neglecting piezo-resistive effects, its Gauge factor is :  (A) 2.8 (B) 2.6 (C) 4.6 (D) 3.6

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 37 views

If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 13 views

When a dipole antenna of 1/8 length has an equivalent total resistance of 1.5 Watt then the efficiency of the antenna is   (A) 0.89159% (B) 8.9159% (C) 89.159% (D) 891.59%

asked May 17, 2018 in Electronics communication by Shimroz123
1 answer 21 views

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 62 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

What happens to the resistance when the current increases?

asked Mar 15, 2018 in Electrical Engineering by Quiz
1 answer 29 views

if voltage is 230 Volts , frequency is 50 Hz and current is 1 ampere then what will be the resistance?

asked Dec 4, 2017 in Electrical Engineering by Quiz
2 answers 52 views

If resistance is 8 Ohm and current is 16 ampere then what will be the voltage and power?

asked Oct 21, 2017 in Electrical Engineering by Quiz
1 answer 172 views

The hot resistance of a tungsten lamp is about 10 times the cold resistance. Accordingly, cold resistance of a 100 W, 200 V lamp will be

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

What is resistance wire made of?

asked Jan 4, 2018 in Electrical Engineering by Quiz
0 answers 8 views

 When alternator excitation increases and machine is operating at lagging power factor then (A) Armature current increases (B) Armature current decreases (C) Armature current remains unchanged (D) Armature voltage remains unchanged

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 10 views

If the diameter of the current carrying conductor increases then the corona loss (a) increases (b) decreases (c) remains unchanged (d) none of these

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 121 views

Two heater wires of equal length are connected first in series and then in parallel. The ratio of heat generated from series to parallel connection will be (a) 4 : 1 (b) 2 : 1 (c) 1 : 2 (d) 1 : 4

asked May 25, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is: (1) 400 Hz (2) 800 Hz (3) 1200 Hz (4) None of these

asked May 22, 2018 in Electrical Engineering by Shimroz123
0 answers 19 views

If frequency is decreased 4 times, then skin depth of an Electromagnetic wave inside a conductor will be :  A) halved B) quadrupled C) doubled D) no change

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 18 views

 A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is vd . If the diameter of wire is made d/3, then drift velocity becomes

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
1 answer 82 views

A drawn wire of resistance 5 Ω is further drawn so that its diameter becomes one-fifth of the original. What is its resistance with volume remaining the same ? (a) 25 Ω (b) 125 Ω (c) 625 Ω (d) 3125 Ω

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

In a certain three -wire Y -connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages will be: A. 2,000 V B. 6,000 V C. 666 V D. 3,464 V

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 328 views

A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span?

asked Mar 22, 2018 in Engineering Mechanics by Shimroz123
0 answers 20 views

When ‘n’ resistances each of value ‘r’ are connected in parallel, then the resultant resistance is ‘x’. When these ‘n’ resistances are connected in series, total resistance is  (A) n2X (B) X/n (C) n2/X (D) nX2

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

The current in a 200 mH coil increases from 2 to 5 A in 0.1 Second. What is rate of change of current? A. 30 A/s B. 20 A/s C. 10 A/s D. none of these

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
0 answers 22 views

If both the number of turns and core length of an inductive coil are doubled, then its self inductance will be (a) halved (b) doubled (c) quadrupled (d) unaffected

asked May 25, 2018 in Inductance by Shimroz123
1 answer 26 views

A nichrome wire used as heater coil has the resistance of 1 ohm/m. For a heater of 1000 W at 200 V, the length of wire required will be 

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
1 answer 61 views

If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 16 views

In a 3-phase 4-wire distribution system three unbalanced but equal magnitude impedances are connected between respective lines and neutral. The magnitude of current in the neutral conductor for RYB and RBY phase sequences are (A) zero (B) same (C) different (D) same in magnitude but differs in phase.

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

What is the diameter of the GI pipe through which the earth wire needs to be taken out?

asked May 29, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

 If the field circuit resistance of a d.c. generator exceed its critical value, then the generator : -  a) fails to build up b) builds up a very high voltage c) exceeds its current capacity d) produces power beyond its rating 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

If a rigid body is in equilibrium under the action of three forces, then?

asked Mar 22, 2018 in Engineering Mechanics by Shimroz123
0 answers 25 views

In case of four pole, lap wound machine if the air gap under each pole is the same, then what will be the result?  (A) There will be reduced eddy currents (B) There will be reduced hysteresis loss (C) Current in each path will not be the same (D) It will result in higher terminal voltage

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

A series RLC circuit resonate at 200 Hz. If the capacitance is increased to four times, the circuit will be in resonance at   (a) 100 Hz (b) 200 Hz (c) 400 Hz (d) 800 Hz  

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
0 answers 30 views

When the separation between two charges is made four times, the force between them  (a) increases four times (b) decreases four times (c) increases sixteen times (d) decreases sixteen times

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

A 10A DC Ammeter has a resistance of 0.1 Ω is to be extended to 50 A, the required shunt wire is A) Manganin wire of 20 m Ω B) Constantan wire of 20 m Ω C) Manganin wire of 25 m Ω D) Constantan wire of 25 m Ω

asked Jun 4, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 27 views

The resistance of a few meters of wire conductor in closed electrical circuit is?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 6 views

Describe the importance of three wire and four wire configuration for RTD with suitable circuit diagram.

asked Sep 13, 2018 by Shimroz123
0 answers 14 views

If the emitter resistance ‘Re ’ in a transistor amplifier is removed, then (a) base to emitter junction will be less forward biased. (b) gain of amplifier decreases. (c) Q-point becomes unstable. (d) All of these 

asked May 25, 2018 in Amplifier by Shimroz123
1 answer 16 views

When an antenna of input resistance 73 ohm is connected to a 50-ohm line and if the losses are ignored then its efficiency will be nearly   (A) 0.19 (B) 0.81 (C) 0.97 (D) 1.19

asked May 17, 2018 in Electronics communication by Shimroz123
1 answer 80 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

what is the difference between four point starter and three point starter?

asked Nov 30, 2017 in Electrical Engineering by Quiz

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