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Dc basic
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ A magnetic circuit requires 800 AT to produce a certain quantity
of flux in magnetic circuit. If its excitation coil has 100 turns and
5 ω resistance, the voltage tobe applied in exciting coil is 40 V [other wrong options] [Discuss in forum] 60 V 80 V 8 V |
Q22 ⇒ The emf induced in a coil due to relative motion of a magnet is
independent of coil resistance. [other wrong options] [Discuss in forum] magnet motion. number of coil turns. pole strength of the magnet. |
Q23 ⇒ The inductance of a long solenoid of length 1,000 mm wound
uniformly with 3000 turns on a cylindrical paper tube of 60 mm
diameter is 32 mH [other wrong options] [Discuss in forum] 3.2 µH 3.2 mH 3.2 H |
Q24 ⇒ Two coils are coupled in such a way that the mutual inductance
between them is 16 mH. if the inductances of the coils are 20 mH
and 80 mH respectively, the coefficient of coupling is 0.4 [other wrong options] [Discuss in forum] 0.01 0.1 0.0025 |
Q25 ⇒ Which of the following inductors will have the least eddy current
losses? air-cored. [other wrong options] [Discuss in forum] iron cored. wooden cored laminated iron cored. |
Q26 ⇒ Core of an electromagnet should have both (a) and (b). [other wrong options] [Discuss in forum] low coercivity. high susceptibility. none of these. |
Q27 ⇒ Which of the following is not bilateral element? Constant current source [other wrong options] [Discuss in forum] Resistor. Inductor. Capacitor. |
Q28 ⇒ If the number of branches in a network is 'B', the number of nodes
is 'N' and the number of dependent loops is 'L' then the number
of independent node equations will be N - 1 [other wrong options] [Discuss in forum] N + L - 1 B - 1 B - N |
Q29 ⇒ Ideal current source have infinite internal resistance. [other wrong options] [Discuss in forum] zero internal resistance. low value of voltage. large value of current. |
Q30 ⇒ In nodal analysis, if there are N nodes in the circuit, then how
many equations will be written to solve the network? N - 1. [other wrong options] [Discuss in forum] N + 1. N. N - 2. |
Q31 ⇒ The theorem that enables a number of voltage (or cuiTent) sources
to be combined directly into a single voltage (or current) source is
the____ theorem. Millman's [other wrong options] [Discuss in forum] compensation reciprocity Maxwell's |
Q32 ⇒ The first and last critical frequency of an RC-driving point
impedance function must respectively be a pole and a zero [other wrong options] [Discuss in forum] a zero and a pole a zero and a zero a pole and a pole |
Q33 ⇒ The hot resistance of the filament of a bulb is higher than the cold
resistance because the temperature coefficient of the filament is positive. [other wrong options] [Discuss in forum] negative. infinite. zero. |
Q34 ⇒ For determining the polarity of the voltage drop across a resistor,
it is necessary to know the direction of current flowing through the resistor. [other wrong options] [Discuss in forum] value of resistor. value of current. value of emf in the circuit. |
Q35 ⇒ What causes electromagnetic wave polarization? Transverse nature of electromagnetic wave. [other wrong options] [Discuss in forum] Refraction. Reflection. Longitudinal nature of electromagnetic wave. |
Q36 ⇒ The absorption or evolution of heat energy, if a current is allowed
to flow in a conductor having its different parts at different
temperatures is known ____as effect. Thomson [other wrong options] [Discuss in forum] Seebeck Peltier Joule's |
Q37 ⇒ In gases the flow of current is due to electrons, positive ions and negative ions [other wrong options] [Discuss in forum] electrons only. positive and negative ions. electrons and positive ions |
Q38 ⇒ The draft velocity of electrons is very small in comparison to speed of light. [other wrong options] [Discuss in forum] larger than speed of light. almost equal to speed of light equal to speed of light. |
Q39 ⇒ An electric current is the movement of free electrons predominately in one direction. [other wrong options] [Discuss in forum] random movement of electrons in a conductor pressure difference between two poles. the power that causes drift of electrons. |
Q40 ⇒ The emf of primary cell depends upon the both (b) and (c). [other wrong options] [Discuss in forum] physical dimensions of a cell. nature of electrolyte. nature of electrode. |
Or |