An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 &ohm; and temperature coefficient of resistance is 4.5 10 3/ C , then its ON state filament temperature in C is approximately ___________.

An incandescent lamp is marked 40W, 240V. If resistance at room temper

1.	An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 Ω and temperature coefficient of resistance is 4.5 10^{3/ C} , then its ON state filament temperature in C is approximately ___________.
A.	1171
B.	2471
C.	1417
D.	All of the above
Answer» C. 1417

Discussion

No Comment Found

Related MCQs

A series RLC circuit consisting of R = 10 ohms, XL = 20 ohms and Xc = 20 ohms is connected across an ac supply of 100 V (rms). The magnitude and phase angle (with reference to supply voltage) of the voltage across the inductive coil are respectively
A 3 V dc supply with an internal resistance of 2 &ohm; supplies a passive non-linear resistance characterized by the relation VNL = I2 NL. The power dissipated in the non-linear resistance is
The Thevenin s equivalent of a circuit operating at = 5 rad/s, has Voc = 3.71 15.9 V and Z0 = 2.38 j 0.667 &ohm; . At this frequency, the minimal realization of the Thevenin s impedance will have a
An average-reading digital multimeter reads 10 V when fed with a triangular wave, symmetric about the time-axis. For the same input an rmsreading meter will read
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross-sectional area of 300 mm2. The inductance of the coil corresponding to a magnetizing current of 3A will be (Given that 0 = 4 10 7 H/m)
A capacitor consists of two metal plates each 500 500 mm2 and spaced 6 mm apart. The space between the metal plates is filled with a glass plate of 4 mm thickness and a layer of paper of 2 mm thickness. The relative permittivities of the glass and paper are 8 and 2 respectively. Neglecting the fringing effect, the capacitance will be (Given that 0 = 8.85 10 12 F/m)
Divergence of the vector field V (x, y, z) = (x cos xy + y) i + (y cos xy) j + (sin z2 + x2 + y2) k is
Two point charges Q1 = 10 C and Q2 = 20 C are placed at coordinates (1, 1, 0) and ( 1, 1, 0) respect ively. The total electric flux passing through a plane z = 20 will be
<table><tr><td rowspan="2">Consider the following statements with reference to the equation </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> p</center></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;"> t</td></tr></table> 1. This is a point form of the continuity equation 2. Divergence of current density is equal to the decrease of charge per unit volume per unit at every point 3. This is Max well's divergence equation 4. This represents the conservation of charge Select the correct answer:
An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 &ohm; and temperature coefficient of resistance is 4.5 10 3/ C , then its ON state filament temperature in C is approximately ___________.

An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 Ω and temperature coefficient of resistance is 4.5 10 3/ C , then its ON state filament temperature in C is approximately ___________.

Discussion

No Comment Found

Related MCQs

Reply to Comment

An incandescent lamp is marked 40W, 240V. If resistance at room temperature (26 C) is 120 Ω and temperature coefficient of resistance is 4.5 10^{3/ C} , then its ON state filament temperature in C is approximately ___________.