three phase to single phase cycloconverter
Last Answer : three phase to single phase cycloconverter
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519 views
1 answer
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Nov 16, 2017
by
anonymous
60 views
0 answers
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Apr 1, 2020
by
anonymous
what is cycloconverter ?
Last Answer : Cycloconverter is a device which convert fixed AC input frequency to variable output frequency or variable input frequency to fixed output frequency.
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84 views
1 answer
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Aug 6, 2017
by
anonymous
What is meant by negative converter group in a cycloconverter?
Last Answer : The part of the cycloconverter circuit that permits the flow of current during negative half cycle of output current is called negative converter group.
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9 views
1 answer
What is meant by positive converter group in a cycloconverter?
Last Answer : The part of the cycloconverter circuit that permits the flow of current during positive half cycle of output current is called positive converter group.
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9 views
1 answer
A cycloconverter is a (a) frequency change r(fc) from higher to lower frequency with one-stage conversion (b) fe from higher to lower frequency with two-stage conversion (c) fc from lower to higher frequency with one-stage conversion (d) Either (a) or (c)
Last Answer : A cycloconverter is a (a) frequency change r(fc) from higher to lower frequency with one-stage conversion (b) fe from higher to lower frequency with two-stage conversion (c) fc from lower to higher frequency with one-stage conversion (d) Either (a) or (c)
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812 views
1 answer
asked
May 13, 2018
by
anonymous
Explain cycloconverter and its types.
Last Answer : Cycloconverter: Cycloconverter is an AC to AC converter which converts input AC into variable AC. It changes frequency. Basically, there are two types of cycloconverter one is step up ... Disadvantages of cycloconverter: So many thyristors are required in cycloconverter.
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468 views
1 answer
asked
Feb 13, 2018
by
anonymous
Draw and explain the circuit diagram for measurement of single phase power using dynamometer type wattmeter.
Last Answer : Circuit diagram for measurement of single phase power using dynamometer type wattmeter: Explanation: It consists of two stationary coils, called current coils and one moving coil, called voltage or ... i.e. power. The meter can be calibrated directly to indicate the power in watts.
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848 views
1 answer
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Jun 4, 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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586 views
1 answer
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May 7, 2020
by
anonymous
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
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116 views
0 answers
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Apr 27, 2020
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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267 views
6 answers
asked
Sep 2, 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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175 views
1 answer
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Aug 21, 2019
by
anonymous
(a) Define permeability. (b) Define MMF. (c) Define form factor of an alternating quantity. (d) Define frequency and time period of an alternating quality. (e) Define transformation ratio of transformer. ... and state the meaning of each term used. (g) Give two applications of single phase motors.
Last Answer : Permeability : It is the ability of a magnetic/Non magnetic material to allow setting up of flux in it. MMF : The magneto motive force (MMF) is the force required to setup flux in a magnetic / ... applications of single phase motors : Water pumps, ceiling fan, lathe machine
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214 views
1 answer
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Aug 21, 2019
by
anonymous
67 views
0 answers
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Aug 13, 2019
by
Alacrity
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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418 views
2 answers
asked
Jul 30, 2019
by
anonymous
74 views
0 answers
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Jul 14, 2019
by
anonymous
Last Answer : Advantages of three phase transformer over bank of single phase transformers: For identical magnitudes of power transformation, i) Saving in copper conductor. ii) Saving in electromagnetic core material. ... material such as insulating oil. v) Saving in overall cost. vi) Higher efficiency.
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164 views
1 answer
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Sep 18, 2018
by
anonymous
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.
Last Answer : Functions of equipment: 1) circuit breaker: disconnects the locomotive equipment from the supply in the event of fault in the equipment / loco. 2) On load tap changer, used to control the ... 6) Traction motor: operates as per the required operating characteristics to take on the traction load.
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155 views
1 answer
asked
Sep 12, 2018
by
anonymous
Draw and explain capacitor start capacitor run single phase induction motor.
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74 views
0 answers
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Sep 1, 2018
by
anonymous
State the classification of single phase induction motors.
Last Answer : Types of single phase induction motors: 1. Split phase induction motor. 2. Capacitor start inductor motor. 3. Capacitor start capacitor run induction motor. 4. Permanent split capacitor motor. 5. Shaded pole induction motor.
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163 views
2 answers
asked
Sep 1, 2018
by
anonymous
A single phase 230 V/ 150 V , 1 kVA, 50 Hz transformer is supplied by 230 V AC supply. Find the full load primary and secondary current.
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150 views
0 answers
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Sep 1, 2018
by
anonymous
In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these
Last Answer : In a single-phase induction motor, the operating direction is determined by the Starting circuit
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130 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 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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127 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 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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210 views
1 answer
asked
Apr 29, 2018
by
anonymous
A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is (A) 216 V (B) 226 V (C) 234 V (D) 236 V
Last Answer : A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is 226 V
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144 views
1 answer
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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 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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760 views
1 answer
asked
Apr 28, 2018
by
anonymous
In the capacitor-start, capacitor-run single-phase induction motor (A) two capacitors are connected across the main winding (B) when the centrifugal switch opens, the permanent capacitor is left ... left in the main winding circuit (D) two capacitors are connected across the auxiliary winding.
Last Answer : In the capacitor-start, capacitor-run single-phase induction motor when the centrifugal switch opens, the permanent capacitor is left in the auxiliary winding circuit
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122 views
1 answer
asked
Apr 25, 2018
by
anonymous
The primary turns of a 444 V/222 V, 50 Hz single-phase transformer with a core cross-sectional area of 100 cm2, and a maximum flux density of 1.0 T is (A) 100 (B) 200 (C) 222 (D) 400
Last Answer : The primary turns of a 444 V/222 V, 50 Hz single-phase transformer with a core cross-sectional area of 100 cm2, and a maximum flux density of 1.0 T is 200
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312 views
1 answer
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Apr 25, 2018
by
anonymous
The meter constant of a single-phase 230 V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10 A of 0.9 pf lagging will be
Last Answer : The meter constant of a single-phase 230 V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10 A of 0.9 pf lagging will be 13.80 rpm
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196 views
1 answer
asked
Apr 23, 2018
by
anonymous
The current coil of a single-phase energy meter is wound on (a) One limb of the laminated core (b) Both the limbs of the laminated core with same number of turns (c) Both the limbs of the laminated core with different number of turns (d) The centre of the limb on the laminated core
Last Answer : The current coil of a single-phase energy meter is wound on Both the limbs of the laminated core with same number of turns
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236 views
1 answer
asked
Apr 23, 2018
by
anonymous
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One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is
Last Answer : One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is 0.8
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196 views
1 answer
asked
Apr 23, 2018
by
anonymous
A single-phase ac voltage source has 200 V rms and a system connected consumes an active power of 300 W. What is the reactive power consumed by the system if 2.5 A rms current is drawn ? (a) 100 VAR (b) 200 VAR (c) 300 VAR (d) 400 VAR
Last Answer : A single-phase ac voltage source has 200 V rms and a system connected consumes an active power of 300 W. What is the reactive power consumed by the system if 2.5 A rms current is drawn ? 400 VAR
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712 views
1 answer
asked
Apr 23, 2018
by
anonymous
Single phase series motors are widely used in domestic appliances and operate at speeds (a) 500 to 1000 rpm (b) 1500 to 10,000 rpm (c) 15,000 to 20,000 rpm (d) 50 to 100 rpm
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67 views
0 answers
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Apr 14, 2018
by
anonymous
A single phase, 2000V alternator has armature resistance and reactance of 0.8 ohm and 4.94 ohm respectively. The voltage regulation of the alternator at 100A, 0.8 leading pf is (A) 7% (B) - 8.9% (C) - 6.3% (D) 0%
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692 views
0 answers
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Apr 14, 2018
by
anonymous
A single phase full -wave half controlled bridge converter feeds an inductive load: The two SCRs in the converter are connected to a common DC bus. The converter has to have a free wheeling diode (A) ... to one of the SCRs is missed, it will subsequently cause a high load current in the other SCR
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113 views
0 answers
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Apr 14, 2018
by
anonymous
A single phase fully controlled thyristor bridge ac -dc converter is operating at a firing angle of 25 degree and an overlap angle 10 degree with constant dc output current of 20A. The fundamental power factor (displacement factor) at input ac mains is : (A) 0.78 (B) 0.827 (C) 0.866 (0) 0.9
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159 views
0 answers
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Apr 14, 2018
by
anonymous
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What is the value of form factor in connection with single phase alternating supply systems ? (A) 1.01 (B) 1.11 (C) 1.21 (0) 1.31
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77 views
0 answers
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Apr 14, 2018
by
anonymous
If the conductive loop on the rotor of a simple two -pole, single-phase generator rotates at the rate of 400 rps. The frequency of the induced output voltage will be: A. 40 Hz B. 100 Hz C. 400 Hz D. indeterminable
Last Answer : If the conductive loop on the rotor of a simple two -pole, single-phase generator rotates at the rate of 400 rps. The frequency of the induced output voltage will be: 400 Hz
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198 views
1 answer
asked
Apr 12, 2018
by
anonymous
Comparing the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15Ω, will yield: A. single-phase 32 A; three-phase 16 ... C. single-phase 8 A; three-phase 4 A D. single-phase 16 A; three-phase 0 A
Last Answer : Comparing the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15Ω, will yield: single-phase 16 A; three-phase 8 A
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253 views
1 answer
asked
Apr 12, 2018
by
anonymous
A two -winding single phase transformer has a voltage regulation of 4.5% at full - load and unity power -factor. At full -load and 0.80 lagging power-factor, the voltage regulation will be: (A) 4.5% (B) less than 4.5% (C) more than 4.5% (D) none of the above
Last Answer : A two -winding single phase transformer has a voltage regulation of 4.5% at full - load and unity power -factor. At full -load and 0.80 lagging power-factor, the voltage regulation will be: more than 4.5%
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383 views
1 answer
asked
Apr 11, 2018
by
anonymous
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The direction of rotation of an ordinary shaded pole single phase induction motor (1) Can be reversed by reversing the supply terminal connections to the stator winding (2) Cannot be reversed (3) Can be reversed by open circuit the shading rings (4) Can be reversed by short circuit the shading rings
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264 views
0 answers
asked
Apr 11, 2018
by
anonymous
Which single phase ac motor will you select for record players and tape recorders? a) Hysteresis motor b) Shaded pole motor c) Reluctance motor d) Two value capacitor motor
Last Answer : Which single phase ac motor will you select for record players and tape recorders? Hysteresis motor
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187 views
1 answer
asked
Apr 11, 2018
by
anonymous
A capacitor start, capacitor run single phase induction motor is basically a : - a) ac series motor b) dc series motor c) 2 phase induction motor d) 3 phase induction motor
Last Answer : A capacitor start, capacitor run single phase induction motor is basically a : - 2 phase induction motor
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998 views
1 answer
asked
Apr 11, 2018
by
anonymous
The no~load current of a single phase induction motor is around _____% of full load current. (1) 10 (2) 20 (3) 40 (4) 80
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69 views
0 answers
asked
Apr 10, 2018
by
anonymous
A single phase, half-wave, controlled rectifier has 400 sin (314 t) as the input voltage and R as the load. For a firing angle of 60° for the SCR, the average output voltage is (a) 240/π (b) 400/π (c) 300/π (d) 200/π
Last Answer : C
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2.0k views
1 answer
asked
Apr 10, 2018
by
anonymous
A single-phase AC arc welding transformer supplies approximately (a) 100 volts at 0.35 power factor (b) 60 volts at 0.35 power factor (c) 220 volts at 0.8 power factor (d) 100 volts at 0.6 power factor
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105 views
0 answers
asked
Apr 10, 2018
by
anonymous
A single phase energy meter has a constant of 1200 revolution/kWh. When a load of 200 W is connected, the disc rotates at 4.2 revolutions per min. If the load is on for 10 hours, the meter records an excess of (a) 0.1 kWh (b) 0.2 kWh (c) 1.0 kWh (d) 2.0 kWh
Last Answer : 2
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659 views
1 answer
asked
Apr 10, 2018
by
anonymous
Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting: (1) A capacitor across the mains (2) A capacitor in ... with the auxiliary winding (4) Equal value capacitors in series with the main and the auxiliary windings
Last Answer : Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting: A capacitor is series with the auxiliary winding.
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1.8k views
1 answer
asked
Apr 9, 2018
by
anonymous
In a capacitor start single-phase induction motor, the capacitor is connected in: (A) series with the main winding (B) series with the auxiliary winding (C) series with both the windings (D) parallel with the auxiliary winding .
Last Answer : In a capacitor start single-phase induction motor, the capacitor is connected in: series with the auxiliary winding
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1.2k views
1 answer
asked
Apr 9, 2018
by
anonymous
