Electrical Engineering McQs Part - 2

Electrical Engineering McQs

- which of the following is a dry storage cell?

a. Carbon zinc cell

b. Mercury cell

c. Nickel iron 

d. Nickel cadmium cell

Answer is option d.

- which of the following material is used in solar cells?

a. Silicon

b. Barium

c. Silver 

d. Selenium

Answer is option b.

- A typical output of a solar cell is

a. 0.1 V

b. 0.26 V

c. 1.1 V

d. 2 V

Answer is option b.

- All dry cells when new have about .......V.

a. 1.0 

b. 1.2

c. 1.5

d. 2.0

Answer is option c.

- Dry cell I modification of

a. Deniell cell

b. Leclanche cell

c. Lead acid cell

d. Edison cell

Answer is option b.

-  In India diesel locomotive are manufactured at 

a. Ajmer

b. Varanasi

c. Banglore

d. Jamalpur

Answer is option b.

- Electric locomotives in India are manufactured at

a. Jamalpur

b. Banglore

c. Chittranjan

d. Gorakhpur

Answer is option c.

- Which of the following state capitals is not on broad gauge track?

a. Lucknow

b. Jaipur

c. Bhopal

d. Chandigarh

Answer is option b.

- The speed of a locomotive is controlled by

a. Flywheel

b. Gear box

c. Applying brakes

d. Regulating steam flow to engine

Answer is option d.

- Long distance railways use which of the following

a. 200V D.C.

b. 25 kV single phase A.C .

c. 25 kV two phase A.C.

d. 25 KV three phase.

Answer is option b.

- for consumer the most economical power factor is generally
a. 0.5 lagging
b. 0.5 leading
c. 0.95 lagging
d. 0.95 leading
Answer is option c.

- a load curve indicates
a. Average power used during the period
b. Average energy consumption during the period
c. Either of the above
d. None of these.
Answer is option b.

- Depreciation charges are high in case of
a. Thermal plant
b. Diesel plant
c. Hydroelectric plant
d. Any of these.
Answer is option a.

- ............will offer the least load.
a. Vacuum cleaner
b. Television
c. Hair dryer
d. Electric shaver
Answer is option d.

- Salvage value of the plant is always
a. Positive
b. Negative
c. Zero
d. Any of these.
Answer is option d

- permeance is the reciprocal of
a. Flux density
b. Reluctance
c. Ampere turns
d. Resistance
Answer is option b.

-  The........ Generator has poorest voltage regulation.
a. Shunt
b. Series
c. Compound
d. Over compound.
Answer is option b.

- for both lap and wave winding there are as many commutator bar as the number of
a. Slots
b. Armature conductors
c. Winding elements
d. Poles
Answer is option c.

- DC generator work on the principle of
a. Lenz law
b. Ohms law
c. Faraday laws of electromagnetic induction
d. None
Answer is option c.



- "In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of em.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources".

The above statement is associated with
 (a) Thevenin's theorem (b) Superposition theorem
( c ) superposition theorem ( d ) none of these
Answer is option b.


-  The number of independent equations to solve a network is equal to
(a) the number of chords
 (b) the number of branches
(c) sum of the number of branches and chords
 (d) sum of number of branches, chords and nodes

Answer is option a.



- The superposition theorem requires as many circuits to be solved as there are
(a) sources, nodes and meshes
 (b ) sources
(c ) sources and nodes
 (d) nodes
Answer is option b.



- choose the incorrect statement

(a) A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

(b)A branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.

(c)A branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.

(d) A branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

Answer is option a.


-  In Thevenin's theorems to find Z
 (a) all independent current sources are short circuited and independent voltage sources are open circuited.

( b ) all independent voltage sources are open circuited and all independent current sources are short circuited
 (c) all independent voltage and current sources are short circuited
(d) all independent voltage sources are short circuited and all independent current sources are open circuited

Answer is option d.


- To determine the polarity of the voltage drop across a resistor, it is necessary to know
 (a) value of current through the resistor
(b) direction of current through the resistor
 (c) value of resistor
( d ) EMF in the circuit
Answer is option b.



- A star circuit has element of resistance R/2. The equivalent delta elements will be
(a) R/6
(b)3/2 R
(c) 2R
(d) 4R
Answer is option b.


-  A delta circuit has each element of value R/2. The equivalent elements of star circuit with
(a) R/6
(b) R/3
(c) 2R
( d ) 3R
Answer is option a.


- The circuit parameters may be
(I) active (ii) passive  ( iii) linear ( iv) non linear
Which of  the following is valid for a gas diode?

(a) (i) and (ii)
(b)(i) and (iv)
(c) (ii) and (iv)
Answer is option b.


-  Which of the following is linear and bilateral parameter ?

(a) resistors
(b ) semiconductor
(c) electron tubes
(d ) transistors
Answer is option a.


-  The common voltage across parallel branches with different voltage sources can be determined by the relation

V = V1/R1+V2/R2+V3/R3/ 1/R1+1/R 2+1/R3

The above statement is associated with
 (a) Superposition theorem
( b ) Thevenin theorem
 (c) Norton's theorem
( d ) Millmans theorem
Answer is option d.


-  Kirchhoff'slaw is applicable to
(a) passive networks only
( b ) a.c. Circuits only
 (c) d.c. circuits only
( d ) both b and c
Answer is option d.


-  Kirchhoff's law is not applicable to circuits with (a) lumped parameters
( b ) passive elements
 (c) distributed parameters
( d ) non linear resistance
Answer is option c.


- Kirchhoff's voltage law applies to circuits with
(a) non-linear elements only
(b) linear elements only
 (c) linear, non linear, active and passive elements (d) linear, non-linear, active, passive time varying as wells as time-invariant elements
Answer is option d.



- A network which contains one or more than one source of e.m.f. is known as
(a) linear network (b) passive network
(b) non-linear network (d) active network
Answer is option d.



-  According to Kirchhoff's voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always
 (a) negative
( b ) positive
(c) determined by battery e.m.f.s
(d ) zero
Answer is option d.


 - Kirchhoff's current law is applicable to only
 (a) junction in a network
( b ) closed loop in a network
 (c) electric circuits
( d ) electronic circuit
Answer is option a.


- Kirchhoff's voltage law is related to
(a) junction currents
 (b) battery e.m.fs.
(c) IR drops
 (d) both (b) and (c)
 (e) none of the above
Answer is option d.


- Superposition theorem can be applied only to circuits having
 (a) resistive elements
 (b) passive elements
(c ) non- linear elements
 (d) linear bilateral elements
Answer is option d.


- The concept on which Superposition theorem is based is
 (a) reciprocity
( b ) duality
(c) non-linearity
 (d ) linearity
Answer is option d


- Thevenin resistance is found
(a) by removing voltage sources along with their internal resistances
 (b) by short-circuiting the given two terminals
 (c) between any two 'open' terminals
 (d) between same open terminals as for E
Answer is option d.


- An ideal voltage source should have
 (a) large value of e.m.f.
( b ) small value of e.m.f.
( c ) infinite source resistance
(d ) zero source resistance
Answer is option c.


- A closed path made by several branches of the network is known as
 (a) branch
(b) loop
( c ) circuit
( d ) none
Answer is option b.


- A linear resistor having 0 <R<o is a (a) current controlled resistor
( a )  current controlled resistor
( b ) voltage controlled resistor
( c ) both a and b
( d ) none
Answer is option c.



- With rise in temperature the resistance of pure metals
a. Increases
b. Decreases
c. First increases and then decreases
d. Remains constant
Answer is option a.


- With rise in temperature the resistance of semi conductors
a. Decreases
b. Increases
c. First increase and then decreases
d. Remains constant
Answer is option a.

- Which of the following materials has a negative temperature co - efficient of resistance?
a. Copper
b. Aluminium
c. Carbon
d. Brass
Answer is option c.

- Ohms law is not applicable to
a. Vacuum tubes
b. Carbon resistors
c. High voltage circuits
d. Circuits with low current densities
Answer is option a.

- Varistors are
a. Insulators
b. Non - linear resistors
c. Carbon resistors
d. Resistors with zero temperature coefficient
Answer is option b.

- a relay is basically a
a. Mechanical switch
b. Electronic switch
c. Electromechanical switch
d. Tumbler switch
Answer is option c.

- A circuit that generate square wave is called
a. Oscillator
b. Differentiator
c. Modulator
d. Multi vibrator
Answer is option d.

-  The efficiency of a CVT is generally
a. Less than 60 percentage
b. 100 percentage
c. More than 60 percentage
d. Zero percentage
Answer is option c.


- A device that converts DC power into AC power of required frequency is called
a. Convertor
b. Inverter
c. Selector
d. None
Answer is option b.

- The input impedance of an ideal Op amp is
a. Finite
b. Zero
c. Unity
d. Infinite
Answer is option d.

- laminations of core originally made of
a. Cast iron
b. Carbon
c. Silicon steel
d. Stainless steel
Answer is option c.

- which of the following could be lamina approximately the thickness of laminations of a DC machine.
a. 0.005 mm
b. 0.05 mm
c. 5mm
d. 0.5 mm
Answer is option d.

- the armature of DC generator is laminated to
a. Reduce the bulk
b. Provide the bulk
c. Insulate the core
d. Reduce Eddy current loss
Answer is option d.

- the field coils of DC generator are usually made of
a. Mica
b. Copper
c. Cast iron
d. Carbon
Answer is option b.

- the commutator segments are connected to the armature conductors by means of
a. Copper lugs
b. Resistance wires
c. Insulation pads
d. Brazing
Answer is option a.

- in DC generator the cause of rapid brush wear may be
a. Severe sparking
b. Rough commutator surface
c. Imperfect contact
d. Any of the above
Answer is option d.

- copper brushes in DC machine are used
a. Where low voltage and high current are involved
b. Where high voltage and small currents are involved
c. In both of above cases
d. None of these
Answer is option a.

- the material for commutator brushes is generally
a. Mica
b. Copper
c. Cast iron
d. Carbon
Answer is option d.

- Armature reaction of an unsaturated DC machine is
a. Cross magnetising
b. Demagnetizing
c. Magnetising
d. None of these
Answer is option a.

- Eddy currents are induced in the pole shoes of a DC machine due to
a. Oscillating magnetic field
b. Pulsating magnetic flux
c. Relative rotation between field and armature
d. All of the above
Answer is option c.

- A DC generator has
a. Lap winding
b. Wave winding
c. Duplex winding
d. Any of above
Answer is option a.


- Magnetic field in a DC generator is produced by
a. Electromagnet
b. Permanent magnet
c. Both a and b.
d. None of above
Answer is option a.

- The specific gravity  of electrode is measured by
a. Manometer
b. A mechanical  gauge
c. Hydrometer
d. Psychrometer
Answer is option c.

- Over Charging............
a. Produces excessive gassing
b. Loosens the active material
c. Increases the temperature resulting in buckling of plates
d. All above
Answer is option d.

- ............... Of electrolyte indicates the state of charge of the battery .
a. Colour
b. Mass
c. Viscosity
d. Specific gravity
Answer is option d.

- Dry cell is modification of
a. Deniell cell
b. Leclanche cell
c. Lead acid cell
d. Edison cell
Answer is option b.

- Capacity of a battery is expressed in
a. Ah
b. Vh
c. Wh
d. kWh
Answer is option a.

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