98 + Mcqs in Basic Electronics Engineering Page 1 McqOptions

1.	If the armature current of dc series motor has become twice then the torque will become
A.	Twice of the former
B.	Four times of the former
C.	One fourth of the former
D.	Remains same
Answer» C. One fourth of the former

Discussion

2.	For application in electric locomotives or for traction purposes, the most suitable motor is
A.	Dc series motor
B.	Differentially compounded motor
C.	Cumulatively compounded motor
D.	None of these
Answer» B. Differentially compounded motor

Discussion

3.	In order to bring the pointer to rest within a short time,
A.	Gravity control is required
B.	Damping control is required
C.	Spring control is required
D.	All of these
Answer» C. Spring control is required

Discussion

4.	Among the following damping method, the most effective and efficient damping is
A.	Air friction damping
B.	Fluid friction damping
C.	Eddy current damping
D.	None of these
Answer» D. None of these

Discussion

5.	The moving system of induction type single - phase energy meter consists of
A.	One pointer and two control spring
B.	One pointer and one control spring
C.	Two pointer and two control spring
D.	No pointer and no control spring
Answer» E.

Discussion

6.	The braking torque of induction type single - phase energy meter is
A.	Directly proportional to the flux
B.	Inversely proportional to the flux
C.	Directly proportional to the square of the flux
D.	Inversely proportional to the square of the flux
Answer» D. Inversely proportional to the square of the flux

Discussion

7.	The power curve for a purely resistive circuit is zero only when
A.	Current is zero
B.	Voltage is zero
C.	Both current and voltage is zero
D.	None of these
Answer» D. None of these

Discussion

8.	The power absorbed by a pure inductive circuit and pure capacitive circuit is
A.	Zero and non zero
B.	Non zero and zero
C.	Non zero and non zero
D.	Zero and zero
Answer» E.

Discussion

9.	The net power in a series R-C circuit is
A.	Zero
B.	Positive
C.	Negative
D.	None of these
Answer» C. Negative

Discussion

10.	For solving parallel ac circuit, the method used is
A.	Vector method
B.	Admittance method
C.	Symbolic or j - method
D.	All of these
Answer» E.

Discussion

11.	For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with
A.	Mixture of copper and nickel
B.	Mixture of chloride and sodium
C.	Mixture of chloride and sodium
D.	Mixture of salt and coal
Answer» E.

Discussion

12.	The fusing current of a fuse depends on its
A.	Material and its length
B.	Length and its diameter
C.	Material and diameter
D.	Material, length and diameter
Answer» E.

Discussion

13.	The wrong statement among the following is
A.	A fuse can be fitted in an outlet socket
B.	A fuse should not get overheated
C.	The current rating of fuse should not exceed the rating of the smallest cable protected
D.	Fuse having rating less than 3 A can be used in radio
Answer» B. A fuse should not get overheated

Discussion

14.	In HRC fuses, the space within the body surrounding the element is usually filled with
A.	Silver
B.	Zinc
C.	Quartz
D.	Copper
Answer» D. Copper

Discussion

15.	For extinguishing arc in an high voltage fuses, the element can be immersed in
A.	Oil
B.	Carbon tetrachloride
C.	Carbon tetrafloride
D.	Only (a) and (b)
Answer» E.

Discussion

16.	In delta connected system, the potential difference between line outers is
A.	Equal to the phase voltage
B.	Greater than the phase voltage
C.	Less than the phase voltage
D.	None of these
Answer» B. Greater than the phase voltage

Discussion

17.	By using two wattmeter method, power can be measured in
A.	3 - phase, 2 - wire system
B.	3 - phase, 3 - wire system
C.	3 - phase, 4 - wire system
D.	All of these
Answer» C. 3 - phase, 4 - wire system

Discussion

18.	The two wattmeter method is applicable for
A.	Only star connected system
B.	Only delta connected system
C.	Both star connected and delta connected system
D.	None of these
Answer» D. None of these

Discussion

19.	In a balanced 3-phase system, if one of the two wattmeter’s reading is negative then the
A.	Reading should be taken as it is
B.	Reading should be taken after reversing the pressure coil
C.	Reading should be taken after reversing the current coil
D.	All of these
Answer» C. Reading should be taken after reversing the current coil

Discussion

20.	From full load to no load, the change of terminal voltage is more in case of
A.	Lagging power factor
B.	Leading power factor
C.	Unity power factor
D.	Both lagging and leading power factor compared to unity power factor
Answer» E.

Discussion

21.	The synchronous generator is also called an
A.	AC generator
B.	Alternator
C.	DC generator
D.	Only (a) and (b)
Answer» E.

Discussion

22.	In India, the synchronous generator generates
A.	11 kilo - volts
B.	33 kV
C.	66 kV
D.	Either (a) or (b)
Answer» E.

Discussion

23.	The non salient pole type synchronous generator is driven by
A.	Hydraulic turbines
B.	Diesel engines
C.	Steam engines
D.	All of these
Answer» D. All of these

Discussion

24.	The number of cycles of the induced emf per second is equal to
A.	No. of cycles per revolutions x no. of revolutions per second
B.	No. of cycles per second x no. of revolutions per second
C.	No. of cycles per revolutions x no. of revolutions per hour
D.	No. of cycles per revolutions / no. of revolutions per second
Answer» B. No. of cycles per second x no. of revolutions per second

Discussion

25.	Copper losses occurs due to ohmic resistance in
A.	Primary winding
B.	Secondary winding
C.	Both primary and secondary winding
D.	None of these
Answer» D. None of these

Discussion

26.	Efficiency of a transformer is maximum at
A.	Leading power factor
B.	Lagging power factor
C.	Unity power factor
D.	None of these
Answer» D. None of these

Discussion

27.	If the transformer is loaded then the secondary terminal voltage falls for and rises for
A.	Lagging power factor, leading power factor
B.	Lagging power factor, unity power factor
C.	Unity power factor, lagging power factor
D.	Leading power factor, lagging power factor
Answer» B. Lagging power factor, unity power factor

Discussion

28.	Copper losses is proportional to
A.	kVA
B.	square of kVA
C.	cube of kVA
D.	none of these
Answer» C. cube of kVA

Discussion

29.	The efficiency of the transformer will be maximum when
A.	Iron losses is equal to the twice of the copper losses
B.	Copper losses is equal to the twice of the iron losses
C.	Iron losses is equal to the copper losses
D.	All of these
Answer» B. Copper losses is equal to the twice of the iron losses

Discussion

30.	The frequency of the induced emf in an induction motor is
A.	Greater than the supply frequency
B.	Lesser than the supply frequency
C.	Same as the supply frequency
D.	None of these
Answer» D. None of these

Discussion

31.	In an induction motor, rotor speed is always
A.	Less than the stator speed
B.	More than the stator speed
C.	Equal to the stator speed
D.	None of these
Answer» B. More than the stator speed

Discussion

32.	Slip of an induction motor increases with
A.	increase in current and decrease in torque
B.	increase in current and torque
C.	decrease in current and torque
D.	decrease in current and increase in torque
Answer» C. decrease in current and torque

Discussion

33.	The frequency of rotor current in an induction motor is
A.	slip times the frequency of stator current
B.	slip times the frequency of supply
C.	One by slip times the frequency of stator current
D.	One by slip times the frequency of supply
Answer» C. One by slip times the frequency of stator current

Discussion

34.	Slip ring induction motor has
A.	Low starting torque
B.	Medium starting torque
C.	High starting torque
D.	None of these
Answer» D. None of these

Discussion

35.	Buzzer in principle is a bell
A.	with hammer
B.	with gong
C.	with both hammer and gong
D.	without hammer and gong
Answer» D. without hammer and gong

Discussion

36.	In telegraphic machine, the machine parts that sends the message and the machine parts that receives the message are
A.	Morse key, Morse key
B.	Morse key, Morse sounder
C.	Morse sounder, Morse key
D.	Morse sounder, Morse sounder
Answer» C. Morse sounder, Morse key

Discussion

37.	Electric heaters is made up of
A.	Chromed iron
B.	Brass
C.	Steel
D.	Both (a) and (b)
Answer» E.

Discussion

38.	Heating element of electric iron box is an alloy of
A.	Copper and nickel
B.	Nickel and cobalt
C.	Iron and magnesium
D.	Nickel and chromium
Answer» E.

Discussion

39.	In leclanche cell, anode is packed in a porous pot containing
A.	manganese dioxide
B.	charcoal powder
C.	sulphur dioxide
D.	only (a) and (b)
Answer» E.

Discussion

40.	The emf of the dry cell is about
A.	0 V
B.	0.5 V
C.	1 V
D.	1.5 V
Answer» E.

Discussion

41.	In lead acid accumulators, the container is filled with distilled water and concentrated sulphuric acid in the ratio of
A.	1 : 2
B.	2 : 1
C.	3 : 1
D.	1 : 3
Answer» D. 1 : 3

Discussion

42.	The positive plates of nickel iron cell is made up of
A.	Nickel hydroxide
B.	Lead peroxide
C.	Ferrous hydroxide
D.	Potassium hydroxide
Answer» B. Lead peroxide

Discussion

43.	Lithium cells operates ranging from
A.	-25 ° C to 25 ° C
B.	-50 ° C to 25 ° C
C.	-50 ° C to 75 ° C
D.	-75 ° C to 75 ° C
Answer» D. -75 ° C to 75 ° C

Discussion

44.	3 - point starter is used to start the
A.	Series motor
B.	Shunt motor
C.	Compound motor
D.	Only (b) and (c)
Answer» E.

Discussion

45.	The overload release protects the motor against
A.	Over voltage
B.	Over current
C.	Over load
D.	All of these
Answer» D. All of these

Discussion

46.	In four - point starter, the no volt release is connected across the
A.	Supply line through a protective resistance
B.	In series with field circuit through a protective resistance
C.	Either (a) or (b)
D.	None of these
Answer» B. In series with field circuit through a protective resistance

Discussion

47.	In DOL fuses are provided to protect against
A.	Short circuit protection
B.	Over voltage
C.	Over current
D.	Over load
Answer» B. Over voltage

Discussion

48.	If induction motor is direct switched-on then it will develop
A.	1.5 times their full load torque
B.	1.5 to 2.5 times their full load torque
C.	2.5 times their full load torque
D.	1.5 to 5 times their full load torque
Answer» C. 2.5 times their full load torque

Discussion

49.	Impurities are generally added in the pure semiconductor to
A.	increase the number of electrons
B.	increase the number of holes
C.	increase their conductivity
D.	all of these
Answer» D. all of these

Discussion

50.	In N - type semiconductor, the impurities added to a semiconductor are
A.	Trivalent
B.	Pentavalent
C.	Monovalent
D.	Tetravalent
Answer» C. Monovalent

Discussion

Explore topic-wise MCQs in ENGINEERING SERVICES EXAMINATION (ESE).

&nbsp;&nbsp;If&nbsp;the&nbsp;armature&nbsp;current&nbsp;of&nbsp;dc&nbsp;series&nbsp;motor&nbsp;has&nbsp;become&nbsp;twice&nbsp;then&nbsp;the&nbsp;torque&nbsp;will&nbsp;become

&nbsp;For&nbsp;application&nbsp;in&nbsp;electric&nbsp;locomotives&nbsp;or&nbsp;for&nbsp;traction&nbsp;purposes,&nbsp;the&nbsp;most&nbsp;suitable&nbsp;motor&nbsp;is&nbsp;

&nbsp;In&nbsp;order&nbsp;to&nbsp;bring&nbsp;the&nbsp;pointer&nbsp;to&nbsp;rest&nbsp;within&nbsp;a&nbsp;short&nbsp;time,&nbsp;

Among&nbsp;the&nbsp;following&nbsp;damping&nbsp;method,&nbsp;the&nbsp;most&nbsp;effective&nbsp;and&nbsp;efficient&nbsp;damping&nbsp;is&nbsp;

&nbsp;The&nbsp;moving&nbsp;system&nbsp;of&nbsp;induction&nbsp;type&nbsp;single&nbsp;-&nbsp;phase&nbsp;energy&nbsp;meter&nbsp;consists&nbsp;of&nbsp;

The&nbsp;braking&nbsp;torque&nbsp;of&nbsp;induction&nbsp;type&nbsp;single&nbsp;-&nbsp;phase&nbsp;energy&nbsp;meter&nbsp;is

The&nbsp;power&nbsp;curve&nbsp;for&nbsp;a&nbsp;purely&nbsp;resistive&nbsp;circuit&nbsp;is&nbsp;zero&nbsp;only&nbsp;when&nbsp;

The&nbsp;power&nbsp;absorbed&nbsp;by&nbsp;a&nbsp;pure&nbsp;inductive&nbsp;circuit&nbsp;and&nbsp;pure&nbsp;capacitive&nbsp;circuit&nbsp;is&nbsp;

The&nbsp;net&nbsp;power&nbsp;in&nbsp;a&nbsp;series&nbsp;R-C&nbsp;circuit&nbsp;is&nbsp;

&nbsp;For&nbsp;solving&nbsp;parallel&nbsp;ac&nbsp;circuit,&nbsp;the&nbsp;method&nbsp;used&nbsp;is&nbsp;

For&nbsp;improving&nbsp;the&nbsp;soil&nbsp;condition&nbsp;and&nbsp;efficiency&nbsp;of&nbsp;earthing&nbsp;system,&nbsp;the&nbsp;pit&nbsp;area&nbsp;around&nbsp;the&nbsp;G.I.&nbsp;pipe&nbsp;is&nbsp;filled&nbsp;with&nbsp;

&nbsp;The&nbsp;fusing&nbsp;current&nbsp;of&nbsp;a&nbsp;fuse&nbsp;depends&nbsp;on&nbsp;its&nbsp;

&nbsp;The&nbsp;wrong&nbsp;statement&nbsp;among&nbsp;the&nbsp;following&nbsp;is&nbsp;

&nbsp;In&nbsp;HRC&nbsp;fuses,&nbsp;the&nbsp;space&nbsp;within&nbsp;the&nbsp;body&nbsp;surrounding&nbsp;the&nbsp;element&nbsp;is&nbsp;usually&nbsp;filled&nbsp;with

For&nbsp;extinguishing&nbsp;arc&nbsp;in&nbsp;an&nbsp;high&nbsp;voltage&nbsp;fuses,&nbsp;the&nbsp;element&nbsp;can&nbsp;be&nbsp;immersed&nbsp;in&nbsp;

In&nbsp;delta&nbsp;connected&nbsp;system,&nbsp;the&nbsp;potential&nbsp;difference&nbsp;between&nbsp;line&nbsp;outers&nbsp;is&nbsp;

By&nbsp;using&nbsp;two&nbsp;wattmeter&nbsp;method,&nbsp;power&nbsp;can&nbsp;be&nbsp;measured&nbsp;in&nbsp;

The&nbsp;two&nbsp;wattmeter&nbsp;method&nbsp;is&nbsp;applicable&nbsp;for&nbsp;

&nbsp;In&nbsp;a&nbsp;balanced&nbsp;3-phase&nbsp;system,&nbsp;if&nbsp;one&nbsp;of&nbsp;the&nbsp;two&nbsp;wattmeter&rsquo;s&nbsp;reading&nbsp;is&nbsp;negative&nbsp;then&nbsp;the&nbsp;

From&nbsp;full&nbsp;load&nbsp;to&nbsp;no&nbsp;load,&nbsp;the&nbsp;change&nbsp;of&nbsp;terminal&nbsp;voltage&nbsp;is&nbsp;more&nbsp;in&nbsp;case&nbsp;of&nbsp;

The&nbsp;synchronous&nbsp;generator&nbsp;is&nbsp;also&nbsp;called&nbsp;an

&nbsp;In&nbsp;India,&nbsp;the&nbsp;synchronous&nbsp;generator&nbsp;generates&nbsp;

&nbsp;&nbsp;The&nbsp;non&nbsp;salient&nbsp;pole&nbsp;type&nbsp;synchronous&nbsp;generator&nbsp;is&nbsp;driven&nbsp;by&nbsp;

The&nbsp;number&nbsp;of&nbsp;cycles&nbsp;of&nbsp;the&nbsp;induced&nbsp;emf&nbsp;per&nbsp;second&nbsp;is&nbsp;equal&nbsp;to&nbsp;

Copper&nbsp;losses&nbsp;occurs&nbsp;due&nbsp;to&nbsp;ohmic&nbsp;resistance&nbsp;in&nbsp;

Efficiency&nbsp;of&nbsp;a&nbsp;transformer&nbsp;is&nbsp;maximum&nbsp;at

&nbsp;If&nbsp;the&nbsp;transformer&nbsp;is&nbsp;loaded&nbsp;then&nbsp;the&nbsp;secondary&nbsp;terminal&nbsp;voltage&nbsp;falls&nbsp;for&nbsp;and&nbsp;rises&nbsp;for&nbsp;

&nbsp;Copper&nbsp;losses&nbsp;is&nbsp;proportional&nbsp;to&nbsp;

The&nbsp;efficiency&nbsp;of&nbsp;the&nbsp;transformer&nbsp;will&nbsp;be&nbsp;maximum&nbsp;when&nbsp;

&nbsp;The&nbsp;frequency&nbsp;of&nbsp;the&nbsp;induced&nbsp;emf&nbsp;in&nbsp;an&nbsp;induction&nbsp;motor&nbsp;is

&nbsp;In&nbsp;an&nbsp;induction&nbsp;motor,&nbsp;rotor&nbsp;speed&nbsp;is&nbsp;always&nbsp;

&nbsp;Slip&nbsp;of&nbsp;an&nbsp;induction&nbsp;motor&nbsp;increases&nbsp;with&nbsp;

&nbsp;The&nbsp;frequency&nbsp;of&nbsp;rotor&nbsp;current&nbsp;in&nbsp;an&nbsp;induction&nbsp;motor&nbsp;is&nbsp;

&nbsp;Slip&nbsp;ring&nbsp;induction&nbsp;motor&nbsp;has&nbsp;

&nbsp;Buzzer&nbsp;in&nbsp;principle&nbsp;is&nbsp;a&nbsp;bell&nbsp;

In&nbsp;telegraphic&nbsp;machine,&nbsp;the&nbsp;machine&nbsp;parts&nbsp;that&nbsp;sends&nbsp;the&nbsp;message&nbsp;and&nbsp;the&nbsp;machine&nbsp;parts&nbsp;that&nbsp;receives&nbsp;the&nbsp;message&nbsp;are&nbsp;

&nbsp;&nbsp;Electric&nbsp;heaters&nbsp;is&nbsp;made&nbsp;up&nbsp;of&nbsp;

&nbsp;Heating&nbsp;element&nbsp;of&nbsp;electric&nbsp;iron&nbsp;box&nbsp;is&nbsp;an&nbsp;alloy&nbsp;of&nbsp;

&nbsp;In&nbsp;leclanche&nbsp;cell,&nbsp;anode&nbsp;is&nbsp;packed&nbsp;in&nbsp;a&nbsp;porous&nbsp;pot&nbsp;containing&nbsp;

The&nbsp;emf&nbsp;of&nbsp;the&nbsp;dry&nbsp;cell&nbsp;is&nbsp;about&nbsp;

&nbsp;In&nbsp;lead&nbsp;acid&nbsp;accumulators,&nbsp;the&nbsp;container&nbsp;is&nbsp;filled&nbsp;with&nbsp;distilled&nbsp;water&nbsp;and&nbsp;concentrated&nbsp;sulphuric&nbsp;acid&nbsp;in&nbsp;the&nbsp;ratio&nbsp;of&nbsp;

The&nbsp;positive&nbsp;plates&nbsp;of&nbsp;nickel&nbsp;iron&nbsp;cell&nbsp;is&nbsp;made&nbsp;up&nbsp;of&nbsp;

&nbsp;Lithium&nbsp;cells&nbsp;operates&nbsp;ranging&nbsp;from&nbsp;

&nbsp;&nbsp;3&nbsp;-&nbsp;point&nbsp;starter&nbsp;is&nbsp;used&nbsp;to&nbsp;start&nbsp;the&nbsp;

The&nbsp;overload&nbsp;release&nbsp;protects&nbsp;the&nbsp;motor&nbsp;against&nbsp;

&nbsp;In&nbsp;four&nbsp;-&nbsp;point&nbsp;starter,&nbsp;the&nbsp;no&nbsp;volt&nbsp;release&nbsp;is&nbsp;connected&nbsp;across&nbsp;the

&nbsp;In&nbsp;DOL&nbsp;fuses&nbsp;are&nbsp;provided&nbsp;to&nbsp;protect&nbsp;against&nbsp;

&nbsp;If&nbsp;induction&nbsp;motor&nbsp;is&nbsp;direct&nbsp;switched-on&nbsp;then&nbsp;it&nbsp;will&nbsp;develop&nbsp;

Impurities&nbsp;are&nbsp;generally&nbsp;added&nbsp;in&nbsp;the&nbsp;pure&nbsp;semiconductor&nbsp;to&nbsp;

In&nbsp;N&nbsp;-&nbsp;type&nbsp;semiconductor,&nbsp;the&nbsp;impurities&nbsp;added&nbsp;to&nbsp;a&nbsp;semiconductor&nbsp;are&nbsp;

If the armature current of dc series motor has become twice then the torque will become

For application in electric locomotives or for traction purposes, the most suitable motor is

In order to bring the pointer to rest within a short time,

Among the following damping method, the most effective and efficient damping is

The moving system of induction type single - phase energy meter consists of

The braking torque of induction type single - phase energy meter is

The power curve for a purely resistive circuit is zero only when

The power absorbed by a pure inductive circuit and pure capacitive circuit is

The net power in a series R-C circuit is

For solving parallel ac circuit, the method used is

For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with

The fusing current of a fuse depends on its

The wrong statement among the following is

In HRC fuses, the space within the body surrounding the element is usually filled with

For extinguishing arc in an high voltage fuses, the element can be immersed in

In delta connected system, the potential difference between line outers is

By using two wattmeter method, power can be measured in

The two wattmeter method is applicable for

In a balanced 3-phase system, if one of the two wattmeter’s reading is negative then the

From full load to no load, the change of terminal voltage is more in case of

The synchronous generator is also called an

In India, the synchronous generator generates

The non salient pole type synchronous generator is driven by

The number of cycles of the induced emf per second is equal to

Copper losses occurs due to ohmic resistance in

Efficiency of a transformer is maximum at

If the transformer is loaded then the secondary terminal voltage falls for and rises for

Copper losses is proportional to

The efficiency of the transformer will be maximum when

The frequency of the induced emf in an induction motor is

In an induction motor, rotor speed is always

Slip of an induction motor increases with

The frequency of rotor current in an induction motor is

Slip ring induction motor has

Buzzer in principle is a bell

In telegraphic machine, the machine parts that sends the message and the machine parts that receives the message are

Electric heaters is made up of

Heating element of electric iron box is an alloy of

In leclanche cell, anode is packed in a porous pot containing

The emf of the dry cell is about

In lead acid accumulators, the container is filled with distilled water and concentrated sulphuric acid in the ratio of

The positive plates of nickel iron cell is made up of

Lithium cells operates ranging from

3 - point starter is used to start the

The overload release protects the motor against

In four - point starter, the no volt release is connected across the

In DOL fuses are provided to protect against

If induction motor is direct switched-on then it will develop

Impurities are generally added in the pure semiconductor to

In N - type semiconductor, the impurities added to a semiconductor are