Current ratio

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Current ratio

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Description : Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.

Last Answer : 1) Voltage ratio: The voltages in primary and secondary winding is proportional to number of turns in primary and secondary respectively. So, the voltage ratio is same as transformation ratio. V2/V1 = N2 ... as transformation ratio of transformer. It is denoted by K. K = N2/N1

Description : If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be

Last Answer : If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be 10

Description : Voltage ratio

Last Answer : Voltage ratio

Description : Turns ratio

Last Answer : Turns ratio formula

Description : Impedance ratio

Last Answer : Impedance ratio

Description : The ratio of the width to the height of the picture frame is called as A) Rastar B) Aspect Ratio C) Length Ratio D) Efficiency  

Last Answer : The ratio of the width to the height of the picture frame is called as Aspect Ratio

Description : If Poisson's ratio of a resistance wire strain gauge is 1.8, then neglecting piezo-resistive effects, its Gauge factor is :  (A) 2.8 (B) 2.6 (C) 4.6 (D) 3.6

Last Answer : If Poisson's ratio of a resistance wire strain gauge is 1.8, then neglecting piezo-resistive effects, its Gauge factor is : 4.6

Description : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :

Last Answer : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to : Z (p.u)

Description : The ratio of active power to apparent power is known as____ factor.

Last Answer : The ratio of active power to apparent power is known as power factor.

Last Answer : The form factor is the ratio of r.m.s. value to average value.

Description : In otto cycle compression ratio is 8. Calculate air standard efficiency. Will it be grater than Carnot Cycle ? Justify your answer. 

Last Answer : No, the Otto cycle efficiency 56.47% will always be lower than Carnot cycle efficiency. Justification: Carnot theorem states that keeping operating conditions same, Carnot engine is more efficient than any other engine. So, Otto cycle efficiency is lower than Carnot cycle efficiency. 

Description : Graph indicating changes in pollutants level w.r.t air fuel ratio

Last Answer : Graph indicating changes in pollutants level w.r.t air fuel ratio

Description : Compressor pressure ratio (CPR)

Last Answer : Compressor pressure ratio (CPR), is the ratio of the air total pressure exiting the compressor to the air pressure entering the compressor. This number is always greater than 1.0.

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.

Description : What is transformation ratio?

Last Answer : Transformation Ratio (k):- It is the ratio of secondary number of turns to primary number of turns. OR It is the ratio of secondary voltage to primary voltage. OR It is the ratio of primary current to secondary current. 

Description : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is

Last Answer : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is 16

Description : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would  (1) increase progressively  (2 ... 0.5 and then increase  (4) increase to a maximum value at α = 0.5 and then decrease

Last Answer : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would increase to a maximum value at α = 0.5 and then decrease

Description : Specific energy consumption of an electric train is the ratio between (A) Specific energy output at driving wheels and efficiency of the traction motor (B) Specific energy output at driving wheels ... (D) Specific energy output at driving wheels and efficiency of the (motor + transmission gear)

Last Answer : Specific energy consumption of an electric train is the ratio between Specific energy output at driving wheels and efficiency of the (motor + transmission gear)

Description : Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) ... than that of a normal induction motor (D) may be less or greater than that of a normal induction motor

Last Answer : C

Description : The Eb/V ratio of a d.c. motor is an indication of its?

Last Answer : The Eb/V ratio of a d.c. motor is an indication of its efficiency.

Description : The ratio of mass of proton to that of electron is nearly?

Last Answer : The ratio of mass of proton to that of electron is nearly 1840.

Description : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as?

Last Answer : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as 2 : 5.

Description : The ratio of limiting friction and normal reaction is known as?

Last Answer : The ratio of limiting friction and normal reaction is known as coefficient of friction.

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.

Last Answer : The ratio of starting torque to full-load torque is least in case of shunt motors.

Last Answer : A synchronous machine with low value of short-circuit ratio has lower stability limit.

Description : The voltage transformation ratio of a transformer is equal to the ratio of?

Last Answer : The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

Description : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Last Answer : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.

Description : Use of auto-transformer is economical when the transformation ratio is?

Last Answer : Use of auto-transformer is economical when the transformation ratio is near unity.

Description : If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be

Last Answer : If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be 10 A

Description : Direct Current (DC) Next Topic : Alternating current (AC)

Last Answer : Direct Current (DC) is the unidirectional electric current. Uni meaning is one. And the flow of charge in same direction. We know that conventional current flow from positive terminal of battery to ... The magnitude of DC may constant or vary but direction do not change with respect to time.

Description : Alternating current (AC)

Last Answer : AC stands for Alternating Current meaning voltage or current that changes polarity or direction respectively over time. An Alternating Current (AC) is an electric current whose magnitude ... energy are known as alternators and are simpler construction than DC electromechanical generators.

Description : Does current flow through a capacitor ?

Last Answer : Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...

Description : What kills, current or voltage?

Last Answer : Current would kill. You can actually have thousands of bolts going through you and not even know it. Yes you probably know already voltage is current times resistance. Since your body is a resistor it would take just a small amount of current to create a very high voltage

Description : A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?

Last Answer : The current is 10.0A.  1ampere = 1 Coulomb per 1 second.  0.1Coulombs ÷ 0.01seconds = 10.0amperes.

Description : Describe the difference between direct and alternating current.

Last Answer : Direct current is the flow of electricity or charge in one direction..  Alternative current is the flow of charge that doesn't flow in one direction. 

Description : Current divider rule

Last Answer : Current divider rule

Description : Current formula

Last Answer : Current formula

Description : Capacitive current

Last Answer : Capacitive current formula

Description : How to find total impedance Z, current I and Impedance angle ?

Last Answer : How to find total impedance Z, current I and Impedance angle ?

Description : Why inductor current lags inductor voltage ?

Last Answer : Inductor is a wire wounding structure having a core material it induces emf which is opposite to the voltage supply and proportional to rate of change of current so current lags the voltage in inductor

Description : Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

Last Answer : When two alternating quantities attain their respective zero or peak values simultaneously, the quantities are said to be in-phase quantities. When the quantities do not attain their respective zero or ... current is leading the voltage or the voltage is said to be lagging behind the current.

Description : List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Last Answer : Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

Description : State various effects of electric current and explain any one.

Last Answer : Effects of Electric Current:  1. Magnetic Effect: When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current carrying ... The rise in temperature is converted into elongation of hot wire element causes displacement of pointer. 

Description : In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

Last Answer : In a series R-C circuit, with the increase in frequency, current Increases

Description : A 1000Ohm, 1 Watt resistor can safely pass a current of

Last Answer : A 1000 Ohm, 1 Watt resistor can safely pass a current of 30 mA

Description : Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Last Answer : Step-down transformer converts high voltage and low current into: Low voltage and high current

Description : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Last Answer : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Description : For a round wire, the approximate value of fusing current is given by

Last Answer : For a round wire, the approximate value of fusing current is given by  K√d3

Description : A current controlled voltage source is equivalent to :  (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier

Last Answer : A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier