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In which header file is isalpha() declared?

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What is a non linear load?

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Why do non linear loads cause harmonics?

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What is the difference between linear and nonlinear electrical loads?

asked Mar 10, 2018 in Power quality by Quiz
1 answer 11 views

Linear and non-linear device

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1 answer 18 views

Two non -inverting amplifiers, one having a unity gain and the other having again of twenty are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain twenty has

asked Apr 29, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 14 views

Measurement of a non -electrical quantity involves the following four subsystems:  a) amplifier block b) display block c) instrumentation block d) transducer block  The correct, sequence in which these block occur is  (1) d,a,c,b (2) d, c, a, b (3) a, c, b, d (4) a, b, c, d

asked Apr 29, 2018 in Electrical Measurements and Instrumentation by Shimroz123
2 answers 55 views

what is linear regulator?

asked Aug 6, 2017 in Electrical Engineering by Zeeshan
0 answers 19 views

What do you mean by linear convolution?

asked Mar 11, 2018 in Signals and Systems by Shimroz
1 answer 36 views

What are the disadvantages of the linear regulator? how are they overcome in the switching regulator? What is continuous and discontinuous mode switching regulator?

asked Feb 11, 2018 in Unit 2 by Quiz
1 answer 19 views

A system is linear if and only if it satisfies

asked May 3, 2018 in Control System by Shimroz123
0 answers 11 views

Is a convolution linear?

asked Mar 11, 2018 in Signals and Systems by Shimroz
1 answer 28 views

A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled then the voltage across each resistor will

asked Apr 29, 2018 in Network Analysis by Shimroz123
1 answer 28 views

Which of the following converts linear displacement from a mechanical reference into a proportional electrical signal containing phase and amplitude information? A) CRO B) LVDT C) RVDT D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

The power flow problem mathematical model for a linear transmission network (A) is non-linear (B) is linear (C) considers time variation of generation (D) does not consider tap-changing transformers

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 20 views

write short notes on Linear motor.

asked Oct 28, 2017 in Electrical Machine by Quiz
1 answer 206 views

Linear Time Invariant (LTI) System

asked Aug 9, 2017 in Digital Signal Processing by Zeeshan
1 answer 33 views

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
0 answers 18 views

What is base load and peak load power plants?

asked Mar 11, 2018 in Thermal and hydro prime movers by Zeeshan
0 answers 38 views

A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 79 views

In load flow Study, a PV bus is treated as a PQ bus when

asked May 8, 2018 in Power system by Shimroz123
1 answer 27 views

A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

asked Apr 30, 2018 in Power system by Shimroz123
1 answer 32 views

A transformer operates 24 hours day at full -load. It's full -load efficiency is :  (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

Generally in a power system network, the load is represented as a :  (A) Constant power in both load flow study and in stability study  (B) Constant power in load flow study and constant impedance in stability study  (C) Constant power in stability study and constant impedance in load flow study  (D) Constant impedance in both load flow study and in stability study

asked Apr 30, 2018 in Power system by Shimroz123
1 answer 16 views

Load compensation in power systems is a process to :  (A) Maintain better voltage profile (B) Increase short circuit capacity of the system (C) Generate required harmonics for loads like arc furnaces (D) Compensate for the line reactance

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 41 views

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 23 views

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

asked Apr 28, 2018 in Network Analysis by Shimroz123
1 answer 152 views

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 50 views

Sparking occurs when a load is switched off because the circuit has high?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 19 views

The maximum load that a power transformer can carry is limited by its?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 25 views

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 14 views

Why does the speed of a DC shunt motor decrease as the load increases?

asked Jul 5 in DC motor by Shimroz123
1 answer 17 views

State why nuclear power plants are used as base load plants and diesel power plants as a peak load plant. 

asked Sep 8, 2018 by Shimroz123
1 answer 27 views

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω  

asked Jun 18, 2018 in Diode by Shimroz123
1 answer 52 views

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 33 views

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 79 views

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load  (A) The armature current increases and the power factor decreases  (B) The armature current decreases and the power factor also decreases  (C) The armature current decreases and the power factor increases but is lagging  (D) The armature current decreases and the power factor increases and is leading

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 31 views

In order to have a lower cost of electrical energy generation the load factor  (1) and the diversity factor should be low (2) should be low but the diversity factor should be high (3) should be high but the diversity factor should be low (4) and the diversity factor both should be high

asked Apr 29, 2018 in Electric Power Generation by Shimroz123
1 answer 68 views

A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 24 views

In a synchronous generator delivering lagging power factor load  (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) excitation emf leads the terminal voltage by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 283 views

The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 19 views

In a lamp load when more than one lamp are switched on the total resistance of the load?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 28 views

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

asked Mar 20, 2018 in Synchronous machine by Shimroz123

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