BEE UNIT-1 BITS

               UNIT-1(introduction to electrical engineering)

SECTION-I: Multiple choice questions

1.  Ohm’s law is applicable to _________ [   d     ]                          
(a) Semiconductors (b) Electrolytes (c) Arc Lamps (d) None

2.  Kirchhoff’s laws are valid for __________ circuits. [     d       ]       
(a) Linear (b) Passive time invariant (c) Non Linear (d) both Linear & Non Linear

3. The capacitance of a parallel plate capacitor is not affected by _______ [      b   ]
(a) Area of Plates (b) Thickness of plates
(c) Separation between plates (d) Nature of Dielectric.

4. The relationship between Electrical energy ( E),Voltage( V) and Charge( Q) is [   c ]

1.         E=Q / V B) E=QV2 C) E=Q x V D) E= V / Q2

5. The curve representing Ohm’s law is _________ [     b     ]
(a) Sine function (b) Linear (c) Parabola (d) Hyperbola

6.) Resistance of human body is about _____Ω [ c ]
(a) 10 (b) 100 (c) 1K (d) Zero

7).The ratio of voltage and current in a closed circuit is ________ [ a ]
(a) Remains Constant (b) Varies (c) Increases (d) Falls

8) Identify the passive element among the following [C]

A.           Voltage source B. current source C.inductor D. transistor

9).How much energy is stored by a 0.05μF capacitor with a voltage of 1000V? [ A]

A.0.025J B.0.05J C.5J D. 100J

10).Mesh Analysis is based on ……… [B ]

A.           KCL B.KVL C. Both D. None

11).  The unit of quantity of electricity is [  B]

(A) Ampere (B) Coloumb (C) Ohm (D) Electron Volt

12)  Conductance is the reciprocal of [ c]

(A) Reactance (B) Impedance (C) Resistance (D) capacitance

13)  Constant Voltage source is __________ [c ]

(a) Active & Bilateral (b) Passive & Bilateral

(c) Active & Unilateral (d) Passive & Unilateral

 14).The relationship between voltage & current is same for two opposite directions of current in case of __________ network. [ d]

(a) Active (b) Passive (c) Unilateral (d) Bilateral

 15) An Ideal current source has zero ____ [ a]

(a) Internal Conductance (b) Internal resistance (c) Voltage on No load (d) Ripple.

16). Kirchoff’s Laws are applicable to ________ circuits. [c ]

(a) AC (b) DC (c) AC & DC (d) Passive Networks only

17) The resistance of the conductor depends on the [ d]

A) Cross section area B) Resistivity of the conductor

C) Length D) All the above

18)  One Farad is equal to [c ]

A) 1 ohm B) 1 V/C C) 1 C/V D) None of the above

19)  The unit of inductance is [ a]

A) Henry B) V sec / A C) Both D) Farad

20)  If in a circuit, the voltage is reduced to half and resistance is doubled, the current will be [c ]

a) 4 Times b) double c) quarter d) half

21)  Kirchoff’s law is applicable to [ c]

a) Ac circuits only b) Dc circuits only c) Both d) passive networks only

22)  The construction for the validity under ohm’s law is that: [a ]

A)Temperature should remain constant B)Current should be proportional to voltage

C)Resistance must be wire would type D)All the above

23 .Kirchhoff’s current law is applicable only to [d ]

a) Electric circuits b) electronic circuits

c) Closed loops in a network d) Junctions in network

24.  An electric current is the __________ [b ]

a) Random movement of electrons in a conductor

b) Movement of free electrons predominately in one direction

c) Pressure difference between two poles d) the power that causes drift of electrons

25) The charge Q flowing through a conductor carrying current of I amperes for t seconds is equal to [ a]

(A)It sec. (B)I/t sec. (C)I/t Amp./Sec. (D) None of these

26). The curve representing ohm’s law is [b ]

(A)Sine function (B) linear (C) a parabola (D) a hyperbola

27). the unit of Inductance is __________ [ b]

A) Ohms B) Henry C) Farads D) Watts

28). _____________ law states that the sum of the currents entering into any node is equal to the sum of the currents leaving that node [c ]

A)Kirchoff’s Voltage B) Faradays C) Kirchoff’s Current D) Electromagnetic

29). A linear resistor is one which obeys [c]

(A) Ampere’s Law (B) Lenz’s Law (C) Ohm’s Law (D) Kirchhoff’s Law

30). the specific resistance is measured in [ a]

(A)Ω-m (B) Ω/m (C)Ω/m (D) Ω/m 32

31). Constant voltage source is [ d]

(A) Active and bilateral (B) passive and bilateral

(C) Passive and unilateral (D) active and unilateral

32).  A pure inductor [d ]

a) dissipate energy b)stores energy c) doesn’t dissipate energy d) both b,c

33).  A capacitor C=5 microfarad. Calculate stored energy in it if a d.c voltage of 100v is applied across it [ a]

a)0.025J b) 0.0025 J c) 0.25J d) 2.5 J

SECTION-II: Fill in the blanks

1.     The condition for validity under ohm’s law is that constant temperature

2.     Capacitance is the property of a circuit element to oppose sudden changes in voltage

3.     The best conductor of electricity is silver

4.    . the property of opposing the flow of electrons is called as   RESISTANCE………..

5.    Inductor acts as short circuit to DC

6.    Ideal sources is nothing but sources …without…………… losses

7.   The examples for passive elements are R,L,C

8.   _EMF______________ is the force that causes a current to flow.

9.   Unit of conductance is mho

10. 1 Volt =  1 Joule per Coulomb

11. The algebraic sign of an IR drop primarily depends upon the Direction of flow current

12.The inductor behaves at steady state as Short circuit

13.Kirchhoff’s voltage law states that the algebraic sum of all branch voltages around any closed path in a circuit is always zero at all instants of time.

         14. The unit of capacitance is Farad

14.Capacitance is a measure of the ability of a capacitor to store an electric charge.

15.The energy stored in a capacitor is −

16.The capacitor at steady state behaves like a Open circuit

17.The property of the material by virtue which it opposes any change in the magnitude or direction of electric current passing through the conductor is Inductance

18.The voltage a cross a resistance of ten ohms and 1A current is 10V