Please Log in or Register for more.

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

81 views

1 Answer

Answer :

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

Like 0 like

Please log in or register to answer this question.

Related Questions


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

124 views 1 answer








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

Show More

204 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







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

148 views 1 answer








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

Show More

91 views 1 answer







Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
Last Answer : Thyristor operated dimmer: A popular thyristor operated dimmer circuit employ TRIAC-DIAC phase control for low AC power control. During each half-cycle, the capacitor charges through (R1+VR1). When the ... time constant {C (R1+VR1)}. Thus by reducing VR1 the lamp brightness can be increased.

Show More

368 views 1 answer







Why CT is never operated with an open secondary ?
Last Answer : CT secondary should never be kept open because it will cause saturation of the core to a high level and very high voltage will appear across the secondary which can breakdown the insulation. One terminal of PT secondary is always grounded to avoid capacitive induction and for human safety

Show More

92 views 2 answers







The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm
Last Answer : The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 rpm

Show More

152 views 1 answer








Last Answer : Battery operated trucks are used in factories for material transportation.

Show More

77 views 1 answer








Last Answer : If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

Show More

91 views 1 answer








Last Answer : The underground system cannot be operated above 66 kV.

Show More

115 views 1 answer








Last Answer : Induction cup relay is operated due to changes in current, voltage, impedance.

Show More

352 views 1 answer








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

Show More

141 views 1 answer








Last Answer : Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds 150°C.

Show More

197 views 1 answer







The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by which part of the transformer?
Last Answer : The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by conservator.

Show More

75 views 1 answer







With rise in temperature the resistance of semi-conductors?
Last Answer : With rise in temperature the resistance of semi-conductors decreases.

Show More

149 views 1 answer







With rise in temperature the resistance of pure metals?
Last Answer : With rise in temperature the resistance of pure metals increases.

Show More

159 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

86 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

82 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







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

98 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

822 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

371 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

397 views 1 answer








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

Show More

193 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

237 views 1 answer








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

Show More

107 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

324 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

367 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

116 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

302 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

277 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

141 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

98 views 1 answer













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

Show More

119 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

226 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







Explain the effect of Harmonics on the Transformer.
Last Answer : Effect of Harmonics on the Transformer:  1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on ... small core vibrations.  5. Saturation problem: Sometimes additional harmonic voltage causes core saturation.

Show More

130 views 1 answer







List two special feature of welding transformer.
Last Answer : Special features of welding transformer: i) It is a step down transformer that reduces the source voltage to a voltage desired according to the demands of the welding process. ii) Having large primary turns and less ... V ii) Secondary voltage - 40 to 60 V iii) Secondary current - 200 to 600 A

Show More

154 views 1 answer







State two applications of isolation transformer
Last Answer : Applications of isolation transformer: i) Isolates the load equipment from supply ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device. iv) Protects loads from harmonic distortion.

Show More

54 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

279 views 1 answer







Equivalent circuit of transformer
Last Answer : Equivalent Circuit Diagram of Transformer Referred to Primary: V1 -Primary Input voltage I1 - Input Current I0- Exciting current/ No load current Im- Magnetizing component ... equivalent of secondary terminal voltage ZL- Load impedance ZL ′- Primary equivalent of load impedance

Show More

381 views 2 answers







Single phase transformer
Last Answer : Single phase Transformer Transformer

Show More

261 views 1 answer






Show More⇦ PreviousNext ⇨