# Electrical Engineering - RL Circuits - Discussion

### Discussion :: RL Circuits - General Questions (Q.No.1)

1.

A 1.5 k resistor and a coil with a 2.2 k inductive reactance are in series across an 18 V ac source. The power factor is

 [A]. 564 [B]. 0.564 [C]. 6.76 [D]. 55.7

Explanation:

No answer description available for this question.

 Sanjeeb said: (Aug 31, 2011) COSQ=R/Z=1.5/1.5+2.2=0.564

 Manfrizy said: (Mar 11, 2012) R/Z = 0.405 not 0.564 as you put it Sanjeeb

 Karimulla said: (Mar 19, 2012) Generally power factor i.e. cos(angle b/w v,i) always less than one.

 Yousuf said: (Jun 1, 2012) |z|=sqrt(1500^2+2200^2)=2663 Angle=inverse tan(2200\1500)=55.7 Power Factor=Cos(55.7)=0.564

 Ryan said: (Feb 18, 2013) Z = sqrt(1500^2+2200^2) = 2663. pf = R/Z = 1500/2663 = 0.564.

 Amit Kumar Jaiswal said: (Nov 2, 2013) POWER FACTOR = (R/Z). Z = SQRT(1.5^2 +2.2^2). Z = 2.662. P.F. = 1.5/2.662 = .563.

 Shaila Kedar said: (Feb 21, 2014) Power factor is always less than 1.

 Noel Zamora said: (Jun 5, 2014) tan 2.2/1.5 = 1.4667, arc tan 1.4667 = 55.71 deg., Therefore cos 55.71 deg. = 0.564 or pf = 0.564(lagging).

 Hadiro Tafoua said: (Mar 9, 2015) Using all method above we get close intervals of answers. Since it all corresponds to electric quantities.

 Shenoy said: (Jun 27, 2015) Power factor always less than 1 use common sense, so simple.

 Venkatesh said: (Aug 28, 2015) R = 1.5. Xl = 2.2. Z = Root of R square+xl square. Cos = R/Z.

 Pavan said: (Oct 21, 2015) Power factor indicates efficiency of the circuit.

 G1Kumar said: (Jul 22, 2016) z = (r^2 + x^2)^(1/2). Ccos = r/z.

 Vicky said: (Oct 4, 2016) cos(q) can never be greater than 1.

 Saipriya said: (Nov 25, 2016) Describe or view the process of the answer.

 Arpana Singh said: (Jun 15, 2018) R/Z=0.405 not 0.564.

 Siddharth said: (Mar 7, 2019) Power factor = R ÷ Z. So, R = 1.3k ohm = 1.3 * 10^3 =1300 ohm, inductive reactians FL = 2.2k ohm =2.2 * 10^3, = 2200 ohm. &. Z = (?). Z = √(R^2 + FL^2), Z = √(1500^2 + 2200^2), Z= 2663. & Power factor = R ÷ Z, = 1500 ÷ 2663, = 0.5632. So, ans is (0.564).

 Kalyan G said: (May 3, 2020) Z=(r^2+XL^2)^1/2=2663. P.f = cosq = r/z 0.564.