205) The value of V in the circuit shown in the given figure is A. 2 V B. 3 V C. 4 V D. 5 V [UPSC IES Elec Engg - I 1998] A B C D 206) In the given figure, the Thevenin equivalent voltage and impedance as seen from the terminals P-Q is given by A. 2 V and 5 O B. 2 V and 7.5 O C. 4 V and 5 O D. 4 V and 7.5 O [GATE 2005] A B C D 207) For the network shown below when I = 0, V = 20 V and when R = 0, I = 10 A. If now R = 3 O what is the value of the current I ? A. 6 A B. 4 A C. 5 A D. 10 A [UPSC IES Elec Engg - I 2006] A B C D 208) For the circuit given in the figure, the Thevenin voltage and resistance as seen at AB are represented by A. 5 V 10 O B. 10 V 10 O C. 5 V 5 O D. 54 V 15 O [GGSIP 2005] A B C D 209) The efficiency for maximum power transfer to the load is A. 100 % B. 75 % C. 25 % D. 50 % A B C D 210) In a balanced Wheatstone bridge, if the position of detector and source are interchanged, the bridge will still remain balanced. This reference can be drawn from A. reciprocity theorem B. compensation theorem C. duality theorem D. equivalence theorem A B C D 211) Which material has the highest electrical conductivity ? A. Silver B. Aluminium C. Iron D. Copper A B C D 212) Resistivity of metals is expressed in terms of A. µ O B. µ O – cm / oC C. µ O – cm D. µ O A B C D 213) Resistivity of copper is of the order of A. 17.2 µ ohm-cm B. 1.72 µ ohm-cm C. 0.172 µ ohm-cm D. 172 µ ohm-cm A B C D 214) Resistivity of copper at absolute zero is A. 3.12 µ ohm-cm B. 1.56 µ ohm-cm C. negligibly small D. 6.62 µ ohm-cm A B C D 215) A copper conductor of one square millimeter can safely carry a current of A. 100A B. 50A C. 25A D. 10A A B C D 216) For carrying an electric current of 75A an aluminum conductor should have a minimum cross-section of A. 25 mm2 B. 10 mm2 C. 15 mm2 D. 20 mm2 A B C D 217) The atomic radius in case of face centered cubic lattice is A. a B. a/2 C. a/3 D. a/4 A B C D 218) Which variety of copper has the best conductivity ? A. Pure annealed copper B. Induction hardened copper C. Hard drawn copper D. Copper containing traces of silicon. A B C D 219) Which variety of copper has the best mechanical strength ? A. Annealed copper B. Hard drawn copper C. Cast copper D. Soft copper A B C D 220) Aluminum ore is known as A. bauxite. B. alum. C. galena. D. hematite. A B C D
Posted on: Sat, 20 Jul 2013 14:39:16 +0000
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