Recent questions tagged constant

Description : Give the expression for ABCD constant of T model.

Last Answer : Expression for ABCD constants of T model: 

Last Answer : It is denoted as τ, tau and has the value of 1/RC. We

Description : Time constant for RC circuit formula τ = RC Where, τ = time constant

Last Answer : Time constant for RC circuit formula τ = RC Where, τ = time constant

Description : Define : i) Diffuse radiation ii) Beam radiation ii) Insolation iv) Solar constant

Last Answer : i) Diffuse radiation: It is the solar radiation which is scattered by the particles in earth's atmosphere and this radiation does not have any unique direction.  ii) Beam radiation: Solar radiation ... from the sun.  OR  It is the average radiation received outside the earth's atmosphere

Description : Define the term solar constant.

Last Answer : Solar energy arrived atmosphere at a constant rate of 1350W/M²

Description : What is meant by energy meter constant?

Last Answer : Energy Meter Constant  A fixed value which is used when converting meter readings to actual energy use, especially when potential transformers and similar types of equipment are used in metering. For example, K=--------rev/Kwh

Description : A transfer function has a second order denominator and constant gain in the numerator

Last Answer : A transfer function has a second order denominator and constant gain in the numerator the system has two zeros at infinity

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 : A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is

Last Answer : Please show the solution for this question

Description : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

Last Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2

Description : While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor ... (C) Its portion of share in load will increase (D) Its power factor would be decreased.

Last Answer : While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then Its portion of share in load will increase

Description : The time constant of the servo-mechanism can be decreased by

Last Answer : The time constant of the servo-mechanism can be decreased by decreasing the inertia of the system

Description : The time constant of a series R-C circuit is given by?

Last Answer : The time constant of a series R-C circuit is given by RC.

Description : Time constant of a capacitive circuit?

Last Answer : Time constant of a capacitive circuit increase with increase of capacitance and increase of resistance.

Description : Time constant of a circuit is the time in seconds taken after the application of voltage to each?

Last Answer : Time constant of a circuit is the time in seconds taken after the application of voltage to each 63% of maximum value.

Description : The time constant of the capacitance circuit is defined as the time during which voltage?

Last Answer : The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.

Description : Time constant of an inductive circuit?

Last Answer : Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.

Last Answer : For constant torque drive armature voltage control speed control method is preferred.

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.

Description : In an actual transformer the iron loss remains practically constant from no load to full load because?

Last Answer : In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

Description : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Last Answer : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

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.