when will be the maximum efficiency of transformer?

94 views
by

1 Answer

Answer :

Transformer efficiency is maximum when copper losses are equal to iron losses.
Like 0 like
by

Please log in or register to answer this question.

Related questions

216 views
An ideal transformer will have maximum efficiency at a load such that?

Last Answer : An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

1 answer
131 views
For a transformer, operating at constant load current, maximum efficiency will occur at?

Description : For a transformer, operating at constant load current, maximum efficiency will occur at?

Last Answer : For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

1 answer
104 views
D.C. generators are normally designed for maximum efficiency around?

Last Answer : D.C. generators are normally designed for maximum efficiency around full-load.

1 answer
245 views
The condition for maximum efficiency for a D.C. generator is?

Last Answer : The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.

1 answer
143 views
Generators for peak load plants are usually designed for maximum efficiency at?

Last Answer : Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

1 answer
82 views
Transformer efficiency

Description : Transformer efficiency

Last Answer : Transformer efficiency

1 answer
297 views
A transformer operates 24 hours day at full -load. It's full -load efficiency is :

Description : 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

Last Answer : A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency 

1 answer
138 views
is efficiency of transformer is greater than electrical machine and why?

Last Answer : The efficiency of transformer is Greater than electrical Machine because there is no rotational losses in transformer and there is no air gap losses in transformer so losses is less in transformer compare to electrical machine so efficiency is higher in case of transformer.

3 answers
81 views
If a transformer is continuously operated the maximum temperature rise will occur in?

Description : If a transformer is continuously operated the maximum temperature rise will occur in?

Last Answer : If a transformer is continuously operated the maximum temperature rise will occur in windings.

1 answer
133 views
The maximum load that a power transformer can carry is limited by its?

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

Last Answer : The maximum load that a power transformer can carry is limited by its voltage ratio.

1 answer
503 views
State why a transformer always have an efficiency of more than 90%.

Description : State why a transformer always have an efficiency of more than 90%.

Last Answer : As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.

1 answer
118 views
Efficiency of a power transformer is of the order of?

Last Answer : The efficiency of a power transformer is of the order of 98 percent.

1 answer
118 views
The efficiency of a transformer, under heavy loads, is comparatively low because?

Description : The efficiency of a transformer, under heavy loads, is comparatively low because?

Last Answer : The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.

1 answer
88 views
Define : i) Maximum Value ii) RMS Value of ac supply

Description : Define : i) Maximum Value ii) RMS Value of ac supply

Last Answer : i) Maximum Value :- The maximum or peak value attained by an alternating quantity during positive or negative half cycle, is called maximum value or peak value.  ii) RMS Value of ac ... as produced by the alternating current when flowing through the same resistance and for the same time. 

1 answer
85 views
Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.

Description : Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.

Last Answer : 1) Virtual height:- The incident and refracted rays follow paths that are exactly the same as they have been if reflection had taken place from a surface located at a greater height, called ... angle of incidence is other than the normal is known as maximum unstable frequency. MUF= fc secθ 

1 answer
97 views
Maximum Power Transfer Theorem 1

Description : Maximum Power Transfer Theorem 1

Last Answer : Maximum Power Transfer Theorem 1

1 answer
111 views
State maximum power transfer theorem for DC circuit.

Description : State maximum power transfer theorem for DC circuit.

Last Answer : Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.

1 answer
4.1k views
An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to

Description :  An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS 

Last Answer :  An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when ZL = R-jXS

1 answer
129 views
method for improving string efficiency

Description : method for improving string efficiency 

Last Answer : The Methods of Improving String Efficiency:-   1) By reducing value of ‘m’ or (‘k’) by using longer cross arm. 2) By Making of ‘m’ or (‘k’) equal to zero 3) By grading Insulator. 4) By Using guard ring.

1 answer
113 views
"Efficiency of thermal power station is low". — Justify.

Description : "Efficiency of thermal power station is low". — Justify. 

Last Answer : Justification: Efficiency of thermal power station is low":- Overall efficiency of T.P.P depends upon efficiency of boiler, turbine and alternator. The heat produced due to combustion of coal ... losses in thermal power plant is 71%, So efficiency of thermal power plant is less about 29% 

1 answer
152 views
A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case

Description : A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of 600 C/W. If the ambient temperature is 300o C ... the device will be A) 1.52 W B) 1.72 W C) 1.92W D) 2.00 W

Last Answer : A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of  ... 300o C, then the maximum allowable power dissipation in the device will be 2.00 W 

1 answer
100 views
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and

Description : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

Last Answer : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

1 answer
889 views
The maximum torque of d.c. motors is limited by?

Description : The maximum torque of d.c. motors is limited by?

Last Answer : The maximum torque of d.c. motors is limited by commutation.

1 answer
377 views
For maximum transfer of power, internal resistance of the source should be?

Description : For maximum transfer of power, internal resistance of the source should be?

Last Answer : For maximum transfer of power, internal resistance of the source should be equal to load resistance.

1 answer
407 views
"Maximum power output is obtained from a network when the load resistance...

Description : "Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with?

Last Answer : "Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with Maximum power transfer theorem.

1 answer
196 views
Which D.C. motor has got maximum self relieving property ?

Last Answer : Series motor has got maximum self relieving property.

1 answer
112 views
The condition for maximum power in case of D.C. motor is?

Last Answer : (b) Clostridium butylicum Lipase Removal of oil stains

1 answer
341 views
The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?

Last Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

1 answer
381 views
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?

Last Answer : In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

1 answer
117 views
In repulsion motor, maximum torque is developed when?

Last Answer : In repulsion motor, maximum torque is developed when brush axis is at 45° electrical to the field axis.

1 answer
308 views
The maximum constant load torque under which a synchronous motor will pull into synchronism...

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

Last Answer : The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

1 answer
106 views
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...

Description : The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

0 answers
293 views
In a power plant if the maximum demand on the plant is equal to the plant capacity, then?

Last Answer : In a power plant if the maximum demand on the plant is equal to the plant capacity, then plant reserve capacity will be zero.

1 answer
101 views
Maximum demand on a power plant is?

Last Answer : Maximum demand on a power plant is the greatest of all "short time interval averaged" demand during a period.

1 answer
123 views
What is the maximum value of power factor?

Description : What is the maximum value of power factor?

Last Answer : 1 is the maximum value of power factor.

1 answer
137 views
In which fault the maximum short circuit current occurs?

Description : In which fault the maximum short circuit current occurs?

Last Answer : In three phase bolted fault the maximum short circuit occurs.

1 answer
1.5k views
What is the maximum value of torque angle in synchronous motor?

Description : What is the maximum value of torque angle in synchronous motor?

Last Answer : The maximum value of torque angle in synchronous motor is 90 degrees electrical.

1 answer
249 views
The synchronous motor will develop maximum power when the load angle is?

Description : The synchronous motor will develop maximum power when the load angle is?

Last Answer : The synchronous motor will develop maximum power when the load angle is 900.

1 answer
114 views
What is the maximum number of circuit breakers in a panel?

Description : What is the maximum number of circuit breakers in a panel?

Last Answer : It depends on that which type of panel is this.

1 answer
28 views
SEER: Seasonal Energy Efficiency Ratio (SEER)

Description : SEER: Seasonal Energy Efficiency Ratio (SEER)

Last Answer : SEER: Seasonal Energy Efficiency Ratio (SEER), is most commonly used to measure the efficiency of a central air conditioner. The higher the SEER, the more efficient the system OR It is the ... the ratio of total capacity to the total KW energy usage at specific humidity and temperature condition.

1 answer
100 views
Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span

Description :  Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span 

Last Answer : Parameter LED CFL Lamp Efficiency  High (more than 70 lumen per watt) Comparatively less (50-60 lumen per watt) Life span (in working hours) 10000 3000

1 answer
963 views
Define PIV, TUF, ripple factor, efficiency of rectifier.

Description : Define PIV, TUF, ripple factor, efficiency of rectifier.

Last Answer : PIV: Peak Inverse Voltage (PIV) is defined as the maximum negative voltage which appears across non-conducting reverse biased diode. TUF : Transformer Utilization Factor (TUF) is defined as the ratio of DC output ... Efficiency of rectifier: η = DC output power/ AC input power = PLdc / Pac

2 answers
95 views
What is the efficiency of Class-B amplifier?

Description : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Last Answer : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

1 answer
472 views
The overall efficiency of Thermal Power Plant is equal to _______________ .

Description : The overall efficiency of Thermal Power Plant is equal to _______________ .  (A) Regenerative Cycle Efficiency (B) Renkine Cycle Efficiency (C) Carnot cycle efficiency (D) None of the above

Last Answer : The overall efficiency of Thermal Power Plant is equal to Regenerative Cycle Efficiency. 

1 answer
118 views
The rankine cycle efficiency of steam power plant is

Description : The rankine cycle efficiency of steam power plant is  (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%

Last Answer : The rankine cycle efficiency of steam power plant is 30-45%

1 answer
91 views
Transmission efficiency of a transmission line increases with the

Description : Transmission efficiency of a transmission line increases with the

Last Answer : Transmission efficiency of a transmission line increases with the increase in power factor and voltage

1 answer
647 views
For high efficiency of transfer of power, internal resistance of the source should be?

Description : For high efficiency of transfer of power, internal resistance of the source should be?

Last Answer : For high efficiency of transfer of power, internal resistance of the source should be less than the load resistance.

1 answer
80 views
The efficiency of diesel locomotives is nearly?

Last Answer : The efficiency of diesel locomotives is nearly 20 to 25 percent.

1 answer
98 views
The overall efficiency of steam locomotive is around?

Last Answer : The overall efficiency of steam locomotive is around 5 to 10 percent.

1 answer
...