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What is a substation? What important equipments are found in a substation?

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asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
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What is a pole mounted substation? At what voltage levels are the found in a power system? 

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In a hydel power station, the number of poles of an alternator is 24. At what rpm the alternator must be driven to produce 50 Hz voltage?

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What number of phases and frequency are adopted to generate, transmit and distribute electrical power in modern power system?

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
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What does a substation do?

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In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
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asked Apr 10, 2018 in Electrical Engineering by Shimroz123
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Give some typical value of generated voltage in a power station. Why is it necessary to step up the voltage further before transmitting?

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
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In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

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why vlsi is important in modern days ?

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asked Apr 29, 2018 in Electrical Engineering by Shimroz123
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Rise time of an amplifier is found to be 1.0µS, its bandwidth (in kHz) is around  A) 2200 B) 1000 C) 350 D) 220 

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Draw neat labeled diagram of single phase AC locomotive showing its various equipments of power circuit and give function of each equipment used in power circuit.

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Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ?  (a) 0 (b) 0.5 (c) 0.866 (d) 1

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
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What type of insulators are used whenever the conductors are dead ended and there is a change in the direction of transmission line?  (A) Shackle type (B) Strain type (C) Pin type (D) Suspension type 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1

asked Apr 28, 2018 in Control System by Shimroz123
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The transfer function of a phase lead compensator is found to be the form (s+z1 ) / (s + p1 ) and that of a lag compensator to be of the form (s+z2 ) / (s + p2 ). Then which of the following conditions must be satisfied?  (A) z1 > p1 and z2 > p2 (B) z1 > p1 and z2 < p2 (C) z1 < p1 and z2 < p2 (D) z1 < p1 and z2 > p2

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1 answer 39 views

A d.c. shunt motor is found suitable to drive fans because they require?

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The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?

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The ammeter reading connected across a CT secondary is 3 A and the voltage reading connected across a PT is 90 V. If the specification of the CT and PT are respectively 1000 A/5 A and 6.6 kV/110 V, What is the actual current and voltage of the line? 

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
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The term ‘SATA’ is associated with which of the following appliances/equipments  A) Washing Machine B) Wet Grinder C) Mixer D) Computer

asked Apr 9, 2018 in Computer Engineering by Shimroz123
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Consider the following statements in respect of important features of IGBT.  P. It has high input impedance gate as that of a MOSFET  Q. It has low ON state voltage drop as that of a BJT  R. Turn-off time is significantly less than MOSFET  Which of these statements are correct?  A) P and Q B) P and R C) Q and R D) P, Q and R

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1 answer 18 views

The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits:  (1) Increase ripple delay (2) Add a 1 to complemented inputs (3) Reduce propagation delay (4) Determine sign and magnitude

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Name the types of generators (alternators) used in (1) thermal plant and (2) in hydel power plant. 

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Name three conventional ways of generating power. Of these three, which one contributes maximum generation in India.

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What are the slot wedges in a DC machine made of?   (a) Mild steel (b) Silicon steel (c) Fibre (d) Cast iron

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What are the losses in a transmission line?

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Which of the following is an important characteristic of LAN?  (a) application independent interfaces (b) unlimited expansion (c) low cost access for low bandwidth channels (d) parallel transmission

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Why is electromagnetism so important?

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Why digital signal processing is important?

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With the help of a schematic diagram explain how a overcurrent relay protects a line during short circuit fault. 

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
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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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
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An induction type energy meter is found to run fast. Correction for this error can be made by  (A) Over-load compensation. (B) Voltage compensation. (C) Moving the brake magnet away from the centre of the disc. (D) Moving the brake magnet towards the centre of the disc.

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Synchronous motor is found more economical when the load is above (1) 2 kW (2) 20 kW (3) 50 kW (4) 100 kW

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
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The resistance between the opposite faces of 1m. cube is found to be 1Ω . If its length is increased to 2 m, with its volume remaining the same, then its resistance between the opposite faces along its length is : (A) 2 Ω (B) 4 Ω (C) 1 Ω (D) 8 Ω

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Thevenin resistance Rth is found?

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List out the energy conservation equipments related to • Lighting system • Induction motor

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