x


91 views

1 Answer

Answer :

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

Please log in or register to answer this question.

Related Questions



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

Show More

208 views 1 answer



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.

Show More

125 views 1 answer




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

Show More

102 views 1 answer




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

Show More

240 views 1 answer




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

Show More

142 views 1 answer



Transformer efficiency
Last Answer : Transformer efficiency

Show More

78 views 1 answer



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 

Show More

272 views 1 answer




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.

Show More

136 views 3 answers



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.

Show More

81 views 1 answer



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.

Show More

133 views 1 answer



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%.

Show More

366 views 1 answer




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

Show More

105 views 1 answer



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.

Show More

115 views 1 answer



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. 

Show More

87 views 1 answer



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 

Show More

84 views 1 answer



Maximum Power Transfer Theorem 1
Last Answer : Maximum Power Transfer Theorem 1

Show More

94 views 1 answer



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.

Show More

111 views 1 answer



 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

Show More

4.0k views 1 answer



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.

Show More

118 views 1 answer



"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% 

Show More

106 views 1 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 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 

Show More

149 views 1 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 (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

Show More

100 views 1 answer



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

Show More

857 views 1 answer



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.

Show More

374 views 1 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?
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.

Show More

400 views 1 answer




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

Show More

193 views 1 answer




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

Show More

109 views 1 answer




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.

Show More

329 views 1 answer




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.

Show More

376 views 1 answer




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

Show More

117 views 1 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?
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.

Show More

307 views 1 answer



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?

Show More

106 views 0 answers




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.

Show More

279 views 1 answer




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

Show More

99 views 1 answer





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

Show More

122 views 1 answer



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

Show More

131 views 1 answer



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.

Show More

1.5k views 1 answer



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.

Show More

234 views 1 answer



What is the maximum number of circuit breakers in a panel?
Last Answer : It depends on that which type of panel is this.

Show More

112 views 1 answer



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

Show More

5 views 1 answer



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

Show More

5 views 1 answer



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

Show More

22 views 1 answer




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

Show More

143 views 1 answer



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.

Show More

27 views 1 answer



 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

Show More

96 views 1 answer



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

Show More

839 views 2 answers



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%

Show More

94 views 1 answer



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. 

Show More

460 views 1 answer



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%

Show More

112 views 1 answer


Show More⇦ PreviousNext ⇨