Recent questions tagged single

asked May 22, 2020 by anonymous

State the meaning of Single line diagram.

Last answer: Meaning of Single line diagram: The single line diagram of a power system is the network which shows the main connections and arrangement of the system components along with their data ( ... breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols.

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34 views 1 answer

asked May 21, 2020 by anonymous

Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it.

Last answer: Circuit Diagram: Waveforms:

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168 views 1 answer

asked May 16, 2020 by anonymous

Single phase transformer

Last answer: Single phase Transformer Transformer

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234 views 1 answer

asked May 7, 2020 by anonymous

Explain MCB and ELCB with connection diagram supplying single phase load.

Last answer: OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel.

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195 views 1 answer

asked May 7, 2020 by anonymous

Single point Cutting tool signature

Last answer: The shape of a tool is specified in a special sequence and this special sequence is called tool signature. The tool signature is given below (i) Back rake angle (ii) Side rake angle (iii) ... rake, end relief, side relief, end cutting edge, side cutting edge angle and 0.8 mm nose radius.

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33 views 1 answer

asked May 7, 2020 by anonymous

State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders

Last answer: Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor

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52 views 1 answer

asked May 3, 2020 by anonymous

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

Last 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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87 views 1 answer

asked May 3, 2020 by anonymous

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

Last 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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72 views 1 answer

asked Apr 27, 2020 by anonymous

Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.

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68 views 0 answers

asked Mar 21, 2020 by anonymous

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

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

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70 views 1 answer

asked Sep 2, 2019 by anonymous

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

Last 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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127 views 6 answers

asked Aug 21, 2019 by anonymous

working principle of single phase motor

Last answer: The Stator of single phase induction motor houses two windings 1. Main (Running) winding 2. Auxiliary (Starting ) winding Rotor of single phase induction motor is ... with starting winding or a capacitor may be permanently connected in series with Auxiliary (Starting ) winding.

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93 views 1 answer

asked Aug 15, 2019 by anonymous

Single stage CE amplifier

Last answer: Requirement(Necessity) of Multistage amplifier: -In many applications we required a high gain. But sometimes gain produced by an amplifier is not sufficient so to increase the gain, we ... necessity of multistage amplifier is for providing high gain. It is also required for high bandwidth.

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49 views 1 answer

asked Aug 13, 2019 by Alacrity

the volt per turn of a certain single phase transformers is 1.7. the transformer has a step ratio of 3825/255volt. calculate the respective number of turns in each winding

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49 views 0 answers

asked Jul 30, 2019 by anonymous

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

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

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144 views 2 answers

asked Jul 26, 2019 by anonymous

Explain construction and working principle of single phase transformer.

Last answer: A single phase transformers is an electrical device that accepts single-phase AC power and outputs single-phase AC. PRINCIPLE... The single-phase transformer works on the principle of ... and secondary windings. Thin steel laminations shall be employed to prevent power losses from the core.

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317 views 4 answers

asked Jul 25, 2019 by anonymous

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

Last 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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156 views 1 answer

asked Sep 4, 2018 by anonymous

Draw the single stage RC coupled amplifier circuit and explain its’s operation.

Last answer: Operation:- The capacitors C1 and C2 are called as the coupling capacitors. As the load resistor RL (not shown in the diagram) is coupled to the amplifier through the coupling capacitor ... connected in the common emitter (CE) configuration. Therefore, this amplifier is called CE amplifier.

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3.0k views 1 answer

asked Aug 11, 2018 by anonymous

State advantages of three phase over single phase.

Last answer: Advantages of 3-phase system over 1-phase system: - 1. More output: For the same size, output of poly-phase machines is always higher than single phase machines. 2. Smaller size: For ... are self- starting: The three phase ac motors are self starting, while single phase induction motor are not.

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2.8k views 4 answers

asked Jun 18, 2018 by anonymous

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

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

Last 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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149 views 1 answer

asked Jun 18, 2018 by anonymous

In a 16-bit microprocessor, a single word is

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

Last answer: In a 16-bit microprocessor, a single word is 16 bit data

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124 views 1 answer

asked May 3, 2018 by anonymous

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage

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

Last 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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223 views 1 answer

asked Apr 29, 2018 by anonymous

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is

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

Last 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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79 views 1 answer

asked Apr 29, 2018 by anonymous

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016

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

Last 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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135 views 1 answer

asked Apr 28, 2018 by anonymous

A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to

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

Last 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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81 views 1 answer

asked Apr 28, 2018 by anonymous

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

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

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

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65 views 1 answer

asked Apr 28, 2018 by anonymous

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum

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

Last 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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690 views 1 answer

asked Apr 25, 2018 by anonymous

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is

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

Last 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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139 views 1 answer

asked Apr 25, 2018 by anonymous

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is

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%

Last 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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264 views 1 answer

asked Mar 22, 2018 by anonymous

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

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

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241 views 1 answer

asked Mar 21, 2018 by anonymous

Describe different RT level computational and sequential components used to design single function processors.

Last answer: RT-level combinational components:- To reduce the complexity in digital logic, combinational components are used, which are more powerful than logic gates. Such combinational ... during a clock edge. An asynchronous inputs value effects the circuit independent of the clock.

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159 views 1 answer

asked Mar 21, 2018 by anonymous

The power factor of a single phase load can be calculated if the instruments available are?

Last 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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133 views 2 answers

asked Mar 21, 2018 by anonymous

In a single phase power factor meter the phase difference between the currents in the two pressure coils is?

Last 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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158 views 1 answer

asked Mar 21, 2018 by anonymous

The two pressure coils of a single phase power factor meter have?

Last 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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71 views 1 answer

asked Mar 21, 2018 by anonymous

Induction type single phase energy meters measure electric energy in?

Last answer: Induction type single phase energy meters measure electric energy in kWh.

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226 views 1 answer