when will be the maximum efficiency of transformer?

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when will be the maximum efficiency of transformer?

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asked Sep 30, 2017 by anonymous

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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.

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asked Mar 19, 2018 by anonymous

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

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.

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asked Mar 19, 2018 by anonymous

D.C. generators are normally designed for maximum efficiency around?

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

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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.

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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.

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Transformer efficiency

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Last Answer : Transformer efficiency

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asked Jun 11, 2019 by anonymous

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

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

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asked Apr 30, 2018 by anonymous

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.

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asked Oct 5, 2017 by anonymous

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

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.

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asked Mar 19, 2018 by anonymous

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

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.

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asked Mar 19, 2018 by anonymous

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

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%.

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asked May 22, 2020 by anonymous

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.

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asked Mar 19, 2018 by anonymous

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

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.

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asked Mar 19, 2018 by anonymous

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

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.

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Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.
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asked May 22, 2019 by anonymous

State maximum power transfer theorem for DC circuit.

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asked Sep 6, 2018 by anonymous

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

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

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asked Aug 25, 2019 by anonymous

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

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asked Aug 2, 2019 by anonymous

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

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asked Jun 18, 2018 by anonymous

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

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
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asked Apr 28, 2018 by anonymous

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

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

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asked Mar 26, 2018 by anonymous

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

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.

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asked Mar 25, 2018 by anonymous

"Maximum power output is obtained from a network when the load resistance...

"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?
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Which D.C. motor has got maximum self relieving property ?

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

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The condition for maximum power in case of D.C. motor is?

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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.

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asked Mar 20, 2018 by anonymous

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.

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In repulsion motor, maximum torque is developed when?

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asked Mar 20, 2018 by anonymous

The maximum constant load torque under which a synchronous motor will pull into synchronism...

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.

307 views 1 answer

asked Mar 20, 2018 by anonymous

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

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?

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asked Mar 20, 2018 by anonymous

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.

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asked Mar 20, 2018 by anonymous

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.

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asked Mar 20, 2018 by anonymous

Power plant having maximum demand more than the installed rated capacity will have utilisation factor?

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asked Mar 20, 2018 by anonymous

What is the maximum value of power factor?

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

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asked Mar 19, 2018 by anonymous

In which fault the maximum short circuit current occurs?

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

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asked Mar 19, 2018 by anonymous

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

What is the maximum value of torque angle in synchronous motor?
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asked Mar 18, 2018 by anonymous

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

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.

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asked Mar 18, 2018 by anonymous

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

What is the maximum number of circuit breakers in a panel?
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asked Mar 10, 2018 by anonymous

At what power maximum efficiency of power transformer and distribution transformer is designed

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Last Answer : Maximum efficiency of the transformer is attained at certain load factor (α) when core losses of transformer is equal to the copper losses. PCore loss = α ^2 X PCopper loss From the ... the day. Hence distribution transformers are designed to have maximum efficiency at 50% of the rated full load

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asked Dec 29, 2021 by itszee

What is the condition for maximum efficiency of transformer?

What is the condition for maximum efficiency of transformer?
Last Answer : When Iron losses is equal to copper losses.

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asked Dec 27, 2021 by itszee

42 The efficiency of a transformer will be maximum when A. copper losses = hysteresis losses B. Hysteresis losses = eddy current losses C. Eddy current losses = copper losses D. Copper losses = iron losses

42 The efficiency of a transformer will be maximum when A. copper losses = hysteresis losses B. Hysteresis losses = eddy current losses C. Eddy current losses = copper losses D. Copper losses = iron losses
Last Answer : D. Copper losses = iron losses

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asked Jul 21, 2021 by jyoti kurekar

The maximum efficiency of a distribution transformer is?

Last Answer : The maximum efficiency of a distribution transformer is at 50% full load.

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asked Mar 19, 2018 by anonymous

SEER: Seasonal Energy Efficiency Ratio (SEER)

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The overall efficiency of Thermal Power Plant is equal to _______________ .

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asked Apr 29, 2018 by anonymous

anonymous · Answer 1 · 2017-09-30T12:22:20+0000

Transformer efficiency is maximum when copper losses are equal to iron losses.

when will be the maximum efficiency of transformer?

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