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In a single bus-bar system there will be complete shut down when fault occurs on the bus itself.

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Description :

An alternator is feeding an infinite bus bar. Its prime mover is suddenly shut down. The alternator will:  (A) Continue to work as alternator but the direction of rotation will reverse. (B) Come to stand still. (C) Continue to work as synchronous motor and direction of rotation will also be same. (D) Will work as an induction motor.

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Description :

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

Answer :

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

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707 views 1 answer
Description :

write short notes on single phase system.

Answer :

A "phase" in an electrical system is often referred to as the waveform (may be voltage or the current) of the power supply. The waveform in an AC system is typically ... domestic household or commercial supplies and street lighting. Industrial supplies requires three phase electrical supply .

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Description :

What is design technology? Explain top down design process.

Answer :

Design technology: Design technology is the manner in which we convert our concept desired system into an implementation. The three main design technologies are 1. Compilation/Synthesis ... general purpose processors and A Gate-level Netlist for special-purpose processors.

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128 views 1 answer
Description :

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is

Answer :

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25

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Answer :

The single phasing relays are used for the protection of three phase motors.

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Answer :

The steady state stability of the power system can be increased by connecting lines in parallel.

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Description :

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

Answer :

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

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86 views 1 answer
Description :

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Answer :

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

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Description :

When the north poles of two bar magnets are brought close together, there will be: A. no force B. a downward force C. a force of attraction D. a force of repulsion

Answer :

When the north poles of two bar magnets are brought close together, there will be: a force of repulsion

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Description :

Explain buck or step down converter and draw its waveforms.

Answer :

Buck converter or Step down converter: Buck converter is a step-down converter. The buck converter step-down the output voltage and step up the output current. Buck converter is a DC to DC converter. ... load. The output voltage is controlled by controlling on period and off period.

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Description :

If a 5-bus test system contains 6 transmission lines and one transformer, how many non-zero elements are there in the system Y-bus ? (A) 25 (B) 12 (C) 11 (D) 19

Answer :

If a 5-bus test system contains 6 transmission lines and one transformer, 19 non-zero elements are there in the system Y-bus.

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2.9k views 1 answer
Description :

What are the components of system bus? A) CPU Bus, Address Bus, Data Bus B) Memory, Control Unit, ALU C) Data Bus, Address Bus, Control Bus D) Register, PC, IR

Answer :

What are the components of system bus? A) CPU Bus, Address Bus, Data Bus B) Memory, Control Unit, ALU C) Data Bus, Address Bus, Control Bus D) Register, PC, IR

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Answer :

The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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Description :

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?

Answer :

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 at the slot edge where coil enters or comes out of the slot.

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95 views 1 answer
Description :

lf the poles of system are lying on the imaginary axis in s-plane, then the system will be

Answer :

lf the poles of system are lying on the imaginary axis in s-plane, then the system will be marginally stable

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Description :

The damping factor of a particular system is unity, the system response will be

Answer :

The damping factor of a particular system is unity, the system response will be critically damped

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Description :

A lightening arrester connected between the line and earth in a power system  (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct lightening strokes (3) suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it

Answer :

A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges

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Description :

In quadrilateral speed-time curve of electric traction system, the accelerations during successive time periods are ______ respectively.  (A) positive, negative and negative (B) positive, zero and negative (C) positive, positive and negative (D) positive, negative and zero

Answer :

In quadrilateral speed-time curve of electric traction system, the accelerations during successive time periods are positive, negative and negative respectively. 

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Description :

Answer :

Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.

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Answer :

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

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Description :

With fault clearing time, the transient stability of a power system

Answer :

With fault clearing time, the transient stability of a power system decreases

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Description :

Answer :

A balanced 3-phase system consists of positive sequence currents.

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Description :

Answer :

Ungrounded neutral transmission system is not recommended because of system insulation being overstressed due to over voltages, insulation overstress may lead to failure and subsequent phase to phase faults, being inadequately protected against ground fault.

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Description :

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

Answer :

The sequence components of current of a single-phase load connected to a 3-phase system are equal positive, negative and zero sequence components

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Answer :

Source transformation Replace the circuit with voltage source in series with a single resistor

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Description :

Why is a capacitor used in a single phase motor and not in three phase motor ?

Answer :

In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

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Description :

In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal

Answer :

In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero 

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161 views 1 answer
Description :

 In a 16-bit microprocessor, a single word is A) 16 bit data B) 32 bit data C) 8 bit data D) 64 bit data 

Answer :

 In a 16-bit microprocessor, a single word is 16 bit data

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137 views 1 answer
Description :

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is (A) 1.2 kW (B) 1 kW (C) 600 W (D) 500 W

Answer :

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is 500 W

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156 views 1 answer
Description :

A single force and a couple acting in the same plane upon a rigid body?

Answer :

A single force and a couple acting in the same plane upon a rigid body cannot balance each other.

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Description :

Answer :

In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

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Description :

Answer :

In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.

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Description :

Answer :

Induction type single phase energy meters measure electric energy in kWh.

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Description :

What are the five types of single phase motors used in the industry?

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Description :

Explain power in single phase AC circuit.

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Description :

When there is one buyer and many sellers then that situation is called (1) Monopoly (2) Single buyer right (3) Down right (4) Double buyers right

Answer :

 Single buyer right 

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Description :

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%

Answer :

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%

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Description :

Describe control of a single lamp from three places. Draw the relevant circuit diagram. 

Answer :

Single lamp control from three places-  It consists of two way switches & intermediate switch, the circuit diagram is as shown in figure. We require two 2-way switches and one intermediate switch and a lamp ... position of any one switch is changed, then the lamp will be turned off.

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116 views 1 answer
Description :

Illustrate with neat wiring diagram a single lamp control by two point method.

Answer :

Single lamp control by two point method:  This system is commonly used for stair case wiring. It consists of two way switches (the switch operates always in one of the two possible positions) the ... the person will change the position of switch S2, so that the lamp will be switched OFF'.

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103 views 1 answer
Description :

Explain the working of a single phase capacitor start induction motor. 

Answer :

Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

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201 views 2 answers
Description :

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Answer :

Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.

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247 views 1 answer
Description :

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

Answer :

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he 0.52

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256 views 1 answer
Description :

A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is (A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm

Answer :

A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is 2 cm 

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103 views 1 answer
Description :

A switch tail ring counter is made by using a single D-FF. The resulting circuit is (A) T-FF (B) D-FF (C) SR-FF (D) JK-FF

Answer :

A switch tail ring counter is made by using a single D-FF. The resulting circuit is T-FF

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Description :

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%

Answer :

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is 11%

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280 views 1 answer
Description :

Answer :

The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.

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Description :

Answer :

If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.

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