For an SCR, di/dt protection is achieved through the use of L in series with SCR.
Description : The voltage across a coil, when di/dt = 20 mA/s and L = 8 H, is: A. 16 mV B. 160 mV C. 1.6 mV D. 2.5 mV
Last Answer : The voltage across a coil, when di/dt = 20 mA/s and L = 8 H, is: 160 mV
Description : The negative sign in the expression e = – N (d∅)/dt is due to: (1) The Fleming’s Rule (2) Thumb’s Rule (3) Faraday’s Law (4) Lenz’s Law
Last Answer : The negative sign in the expression e = – N (d∅)/dt is due to: Lenz’s Law
Description : What is the difference between SCR and thyristor?
Last Answer : SCR is a type of thyristor. Like GTO, IGCT, MCT, TRIAC, DIAC etc. are the types of thyristor.
Description : The function of Snubber circuit connected across the SCR is to (A) Suppress dv/dt (B) Increase dv/dt (C) Decrease dv/dt (D) Decrease di/dt
Last Answer : The function of snubber circuit across a SCR is to Reduce dv/dt
Description : Once SCR starts conducting a forward current, its gate losses control over (A) Anode circuit voltage only (B) Anode circuit current only (C) Anode circuit voltage and current (D) None of the above
Last Answer : Anode circuit voltage and current
Description : SCR can act as _______ controlled rectifier. A. phase B. frequency C. amplitude D. power
Last Answer : SCR can act as phase controlled rectifier.
Description : For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have (a) short rise time with pulse width = 3 µsec (b) long rise time with pulse width = 6 µsec (c) short rise time with pulse width = 6 µsec (d) None of the above
Last Answer : a
Description : How long does DT from alcohol withdrawal last?
Last Answer : I think it’s around 48 hours but I’m not certain. Welcome to fluther and what a tough question to have to ask. Good luck.
Description : What is "DT" Dovetail pressure locked steel grating?
Last Answer : DT dovetail pressure locked steel grating is one of the most aesthetically pleasing types of grating and is often utilized in home architecture and customer/buyer-focused designs. These gratings utilize ... makes them safe for use with high heels and similar footwear. Contact the team at Interstate
Description : Mucomist DT What Medicine ?
Last Answer : Mucomist-DT 600 mg is used in tuberculosis , paracetamol poisoning , pneumonia and fibrosis.
Description : `int(1)/(tsqrt(t^(2) -1))dt`
Last Answer : `int(1)/(tsqrt(t^(2) -1))dt`
Description : For the function `f(x)=int_(0)^(x^(2))(-t^(2)/4)(4-t)dt`
Last Answer : For the function `f(x)=int_(0)^(x^(2))(-t^(2)/4)(4-t)dt` A. local maximum occurs at x = ... maximum occurs at x = -2 D. local minimum occurs at x = 0
Description : When does the growth rate of a population following the logistic model equal zero ? The logistic model is given as dN/dt = rN(1-N/K):
Last Answer : When does the growth rate of a population following the logistic model equal zero ? The logistic ... when death rate is greater than birth rate.
Description : The order of reaction is the number of moles whose concentrations determine the rate of a reaction at a given temperature Give the integrated equation for first order reaction. K = (2.303 / t) * log (a ... a' is the initial concentration of reactants x' is the amount reacted in time t seconds
Last Answer : What is Threshold energy ?
Description : Rate of reaction can be expressed as –dc/dt where dc is small decreasing concentration in time dt seconds, (-) sign indicates that the concentration decreases with time. For every 10 degrees rise of temperature, the rate of reaction is generally. Doubled
Last Answer : Which equation gives the relation between specific rate (k) and Temperature ?
Description : The basic filtration equation is given as dt/dV = (µ/A ∆P). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of ... produced? Neglect filter medium resistance, Rm; assume incompressible cake. (A) 10 (B) 20 (C) 25 (D) 30
Last Answer : (B) 20
Description : The logistic population growth is expressed by the equation (a) dt / dN = Nr K N K − (b) dN / dt = rN K N K − (c) dN / dt = rN (d) dN / dt = rN N K N −
Last Answer : (b) dN / dt = rN K N K −
Description : When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1–N/K) (a) when N/K equals zero (b) when death rate is greater than birth rate (c) when N/K is exactly one (d) when N nears the carrying capacity of the habitat.
Last Answer : (a) when N/K equals zero
Description : According to D' Alembert's principle, m (d 2 x/ dt 2 ) + c (dx/dt) + Kx =0 is the differential equation for damped free vibrations having single degree of freedom. What will be the solution to this differential equation if the system is ... Φ) C x = (A - Bt) e - ωt D x = X e - ξωt (cos ω d t + Φ)
Last Answer : A x = (A + Bt) e – ωt
Description : The equation of motion for a vibrating system with viscous damping is d 2 x/dt 2 + c/m X dx/dt + s/m X x = 0 If the roots of this equation are real, then the system will be A. over damped B. under damped C. critically damped D. none of the mentioned
Last Answer : A. over damped
Description : According to D' Alembert's principle, m (d 2 x/ dt 2 ) + c (dx/dt) + Kx =0 is the differential equation for damped free vibrations having single degree of freedom. What will be the solution to this differential equation if the system is ... ) C. x = (A - Bt) e - ωt D. x = X e - ξωt (cos ω d t + Φ
Last Answer : A. x = (A + Bt) e – ωt
Description : The equation m(d 2 x/ dt 2 ) + c (dx/dt) + Kx = F 0 sin ωt is a second order differential equation. The solution of this linear equation is given as A. complementary function B. particular function C. sum of complementary and particular function D. difference of complementary and particular function
Last Answer : C. sum of complementary and particular function
Description : According to D' Alembert's principle, m (d 2 x/ dt 2 ) + c (dx/dt) + Kx =0 is the A differential equation for damped free vibrations having single degree of freedom. What will be the solution to this differential equation if the system is ... (C)x = (A - Bt) e - ωt ( D )x = X e - ξωt (cos ω d t + Φ
Last Answer : ( A ) x = (A + Bt) e – ωt
Description : According to D' Alembert's principle, m (d 2 x/ dt 2 ) + c (dx/dt) + Kx =0 is the differential equati damped free vibrations having single degree of freedom. What will be the solution to this differ equation if the system is critically ... c. x = (A - Bt) e - ωt d. x = X e - ξωt (cos ω d t + Φ)
Last Answer : a. x = (A + Bt) e – ωt
Description : The equation of motion for a vibrating system with viscous damping is d 2 x/dt 2 + c/m X dx/dt + k/m X x = 0 If the roots of this equation are real, then the system will be a) over damped b) under damped c) critically damped d) none of the mentioned Ans:a
Last Answer : a) over damped
Description : The gradient of the magnetic vector potential can be expressed as a) –με dV/dt b) +με dE/dt c) –με dA/dt d) +με dB/dt
Last Answer : a) –με dV/dt
Description : When electric potential is null, then the electric field intensity will be a) 0 b) 1 c) dA/dt d) –dA/dt
Last Answer : d) –dA/dt
Description : When the Maxwell equation is expressed in frequency domain, then which substitution is possible? a) d/dt = w/j b) d/dt = j/w c) d/dt = jw
Last Answer : c) d/dt = jw
Description : In metals which of the following equation will hold good? a) Curl(H) = J b) Curl(J) = dD/dt c) Curl(H) = D d) Curl(J) = dB/dt
Last Answer : a) Curl(H) = J
Description : Find the Maxwell equation derived from Faraday’s law. a) Div(H) = J b) Div(D) = I c) Curl(E) = -dB/dt d) Curl(B) = -dH/dt
Last Answer : c) Curl(E) = -dB/dt
Description : A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume ... 2V (C) d(VCA )/dt = -FCA - kCA 2V (D) d(VCA )/dt = FCAF - kCA 2V
Last Answer : (D) d(VCA )/dt = FCAF - kCA 2V
Description : The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt (A) At the inlet (B) At the outlet (C) In the reactor (D) Averaged over the inlet and outlet
Last Answer : (B) At the outlet
Description : The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of ∫∞ 0 E.dt is (A) 0 (B) 1 (C) ∞ (D) √2π
Last Answer : (B) 1
Description : The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by (A) dXA /dt = k1 (1 - XA ) 2 (1 + 2XA ) (B) dXA /dt = k1 (1 - XA ... 5XA ) (C) dXA /dt = k1 (1 - XA ) (D) dXA /dt = k1 (1 - XA )/(1 + XA )
Last Answer : (C) dXA /dt = k1 (1 - XA
Description : For a constant pressure reversible process, the enthalpy change (ΔH) of the system is (A) Cv.dT (B) Cp.dT (C) ∫ Cp.dT (D) ∫ Cv.dT
Last Answer : (C) ∫ Cp.dT
Description : In an irreversible process (A) Tds = dE - dW = 0 (B) dE - dW - Tds = 0 (C) Tds - dE + dW < 0 (D) Tds - dT + dW < 0
Last Answer : (C) Tds - dE + dW < 0
Description : If Cv is the coefficient of consolidation, is the time and is drainage path of one dimensional consolidation of soil, the time factor Tv, is given by (A) Tv = d²/Cv t (B) Tv = t²/d²Cv (C) Tv = Cv3 /d²t (D) Tv = Cv t/dt
Last Answer : Answer: Option D
Description : Gibbs-Helmholtz equation is (A) ∆F = ∆H + T [∂(∆F)/∂T]P (B) ΔF = ΔH - TΔT (C) d(E - TS) T, V < 0 (D) dP/dT = ∆Hvap/T.∆Vvap
Last Answer : (A) ∆F = ∆H + T [∂(∆F)/∂T]P
Description : Pick out the Clausius-Clapeyron equation from the following: (A) dP/dT = ∆H/T∆V (B) ln P = - (∆H/RT) + constant (C) ∆F = ∆H + T [∂(∆F)/∂T]P (D) None of these
Last Answer : B) ln P = - (∆H/RT) + constant
Description : Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor? (A) d ln p/dt = Hvap/RT2 (B) d ln p/dt = RT2/Hvap (C) dp/dt = RT2/Hvap (D) dp/dt = Hvap/RT2
Last Answer : (A) d ln p/dt = Hvap/RT2
Description : If Sb, is the average bond stress on a bar of diameter subjected to maximum stress , the length of the embedment is given by (A) l = dt/Sb (B) l = dt/2Sb (C) l = dt/3Sb (D) l = dt/4S
Last Answer : Answer: Option D Answer: Option D
Description : Calculate the recoverable waste heat (Q, in kCal/hour) from flue gases using the followingparameters: V (flow rate of the substance) 2000 m3/hr r (density of the flue gas): 0.9 kg/m3 Cp (specific heat ... (temperature difference): 120 oC h (recovery factor): 50% a. 21600 b. 43200 c. 25600 d. 34000
Last Answer : 21600
Description : What horse power is required to isothermally compress 800 ft^3 of Air per minute from 14.7 psia to 120 psia? A. 28 hp B.108 hp C.256 hp D.13900 hp Formula: W= p1V1 ln (p1/p2) Power = dW / dt
Last Answer : 108 hp
Description : A DT signal x(n) is defined as
Last Answer : x(n)= {2,3,4,5,6} � x(-n)={6,5,4,3, 2} � x(-n+4)={6,5,4,3,2} �
Description : Which of the following is not backward compatible with Cdma2000? a) Cdma2000 1xRTT b) Cdma2000 3xRTT c) Cdma2000 1xEV-DO d) Cdma2000 1xEV-DT
Last Answer : c) Cdma2000 1xEV-DO
Description : What are the two options provided by Cdma2000 1xEV? a) Cdma2000 1xRTT. Cdma2000 3xRTT b) Cdma2000 1xEV-DO, Cdma2000 1xEV-DV c) Cdma2000 1xEV-DT, Cdma2000 1xEV-DO d) Cdma2000 1xRTT, Cdma2000 1xEV-DV
Last Answer : b) Cdma2000 1xEV-DO, Cdma2000 1xEV-DV
Description : What is the use of SCR?
Last Answer : SCR are use in lamp dimming, power regulators, motor control, rectifications of high power AC, control of welding machines and also use as switch these are some uses of silicon controlled rectifier.
Description : How do you convert Flash files to .SCR files on a Mac?
Last Answer : answer:I don't know it it's even possible to do it. And I don't think there's any software that would meet your specifications; Mac software to convert Flash to .scr. .SCR files are ... 's a pretty good program for Windows called InstantStorm that's free and would do the conversion pretty easily.
Description : Are there any other keyboard shortcuts to take screen shots other than Prt Scr.
Last Answer : You can always download a screenshot utility. Most of those are either click-based or have assignable key commands.