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## Related questions

In the case of second order differential equation if the damping ratio is unity, then the poles are  A) Equal, positive and real B) Imaginary and complex conjugate C) Equal, negative and real D) None of the above

Maxwell's bridge is used to measure (A) Inductance (B) Frequency (C) Capacitance (D) Resistance

Which parameter or quantity may be measured by use of Maxwell's Bridge ? (A) Resistance (B) Capacitance (C) Inductance (D) Frequency

Maxwell's inductance - capacitance bridge is used for measurement of Inductance of: -  a) Low Q coils b) Medium Q coils c) High Q coils d) Low and medium Q coils

The characteristic equation of a simple servo system is s2+6s+25=0. Damping factor of the system is: A) 3.2 B) 2.4 C) 1.8 D) 2.9

What is Ampere's law equation?

The angle δ in the swing equation of a synchronous generator is the  (A) angle between stator voltage and current (B) angular displacement of the rotor with respect to the stator (C) angular displacement of the stator mmf with respect to a synchronously rotating axis. (D) angular displacement of an axis fixed to the rotor with respect to a synchronously rotating axis

The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed  (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

The swing equation for a synchronous machine is based on (A) relative motion between load angle and stator magnetic field (B) maximum power flow possible through a particular point (C) net torque and angular displacement (D) relation between excitation voltage and excitation current

A discrete time system is stable if all the roots of the characteristic equation. lie (a) Outside the circle of unit radius (b) Within the circle of unit radius (c) Outside the circle of radius equal to 3 -units (d) On the circle of infinite radius

The system described by the characteristic equation S4 +2S3 +3S2 +4s+5=0 has  A) No roots have positive real part B) One root has positive real part C) Two roots have the positive real parts D) None of these

In the solution of load flow equation, Newton Raphson (NR) method is superior to the GaussSeidal (GS) Method, because the:  (A) Convergence characteristic of the NR methods are not affected by selection of slack bus (B) Number of iterations required in the NR method is not independent of the size of the system (C) Time ... the NR method is less when compared to the GS method (D) Number of iteration required in the NR method is more than compared to that in the GS method

If the characteristics equation of a closed loop system is s2+2s+2=0, then the system is  (A) Over damped (B) Critically damped (C) Under damped (D) Undamped

What is the order of the characteristic equation of an armature controlled DC motor?  (A) First order equation (B) Second order equation (C) Zero order equation (D) Third order equation

Which among the following is the equation for the number of independent loops for a network with n nodes and b branches?  (A) n-1 (B) b+n-1 (C) b-n+1 (D) b-n

The equation V·j = 0 is known as : (A) Poissons’s equation (B) Laplace equation (C) Continuity equation (D) Maxwell equation

In a network containing resistances and reactances the roots of the characteristic equation give for the circuit : (A) The forced response (B) The total response (C) The natural response (D) The damped response

The equation of 50 Hz current sine wave having r.m.s. value of 60 A is?

What is the EMF equation of the transformer?

How many calories does an electric heater of 100 watts generates per second?

Draw and explain the response of first order and second order instruments to the step input.

Explain Faraday’s second law of electrolysis and give its expression.

The second harmonic distortion is defined as the A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency B) Harmonic distortion due to only second harmonic component C) Sum of distortion of first and second harmonic components in the output

A large hydropower station has a head of 324 metre and an average flow of 1370 metre3 / second. The available hydraulic power from this station will be: A) 4.35 MW B) 4.15 MW C) 4.47 MW D) 4.73 MW

A lag-lead compensator for a second order system (A) improves steady state errors, reduces relative stability (B) marginally improves steady state errors, increases relative stability (C) reduces steady state errors, increases relative stability (D) improves both transient response and steady state response

The analog signal given below is sampled by 600 samples per second for m(t) = 3 sin 500 pt + 2 sin 700 pt then folding frequency is: (1) 500 Hz (2) 700 Hz (3) 300 Hz (4) 1400 Hz

For a desirable transient response of a second order system, the damping ratio must be between (a) 0.4 and 0.8 (b) 0.8 and 1.0 (c) 0.3 and 0.5 (d) 0.2 and 0.4

For a 1.8o, 2-phase bipolar stepper motor, the stepping rate is 100 steps/second. The rotational speed of the motor in rpm is  (A) 15 (B) 30 (C) 60 (D) 90

Nano Second is the ____.  a) Millionths of a second b) Billionths of a second c) Trillionth of a second d) Thousands of a second

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

A second order system shows 100% overshoot in its unit step response. It can be categorized as (A) underdamped system. (B) overdamped system. (C) Critically damped system. (D) undamped system.

The second break down in power BJT occurs due to (a) The first break down and the formation of hot spot inside (b) excessive collector current and low collector emitter voltage (c) excessive base current and high collector emitter voltage (d) none of thee above

The current in a 200 mH coil increases from 2 to 5 A in 0.1 Second. What is rate of change of current? A. 30 A/s B. 20 A/s C. 10 A/s D. none of these

The step angle of the stepper motor is 2.5°. If the stepping frequency is 3600 pulses per second, then the shaft speed will be   (a) 144 rps (b) 3600 rps (c) 25 rps (d) 2.5 rps

The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?  (1) 3.54 mH (2) 7.88 mH (3) 39.9 mH (4) 189.3 mH

In a second order system the value of resonant peak will be unity when the damping ratio has a value of  A) Zero B) Unity C) 0.707 D) 0.414