wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

electrical engg 2

Total questions: 75

Worksheet time: 51mins

Name
Class
Date
1.

The Function of a Conservator in a Transformer is ??

a)

To project against internal fault.

b)

To reduce core loss and copper loss

c)

To take care of the expansion and contraction of transformer oil due to the variation of temperature of surroundings.

d)

To cool the transformer oil.

2.

Buchholz's relay gives warning and protection against

a)

Electrical fault inside the transformer itself

b)

Electrical fault outside the transformer in outgoing feeder

c)

For both outside and inside faults.

d)

Non of the above

3.

What is the function of the fins or radiator fins in the transformer

a)

For Cooling transformer

b)

For lighting protection

c)

For earthing protection

d)

For over voltage protection

4.

Which of the following does not change in a Transformer ??

a)

Current

b)

Voltage

c)

Frequency

d)

All of these

5.

A transformer core is laminated to

a)

Reduce hysteresis loss

b)

Reduce eddy current losses

c)

Reduce copper losses

d)

All of these.

6.

The Chemical used in Breather is

a)

Asbestos Fiber.

b)

Silica Sand.

c)

Sodium Chloride.

d)

Silica Gel

7.

A transformer Oil must be Free from ?

a)

Water

b)

Sludge

c)

Moisture

d)

Ordor

8.

If dc voltage is applied to the primary of a transformer it may:

a)

Work

b)

Burn the winding

c)

Give lower voltage on the secondary side

d)

Give higher voltage on the secondary side

9.

Transformer ratings are usually expressed in terms of :

a)

Voltage

b)

KVA

c)

kWh

d)

KW

10.

A common method of cooling a power transformer is ..............

a)

natural air cooling

b)

air blast cooling

c)

oil cooling

d)

any of the above

11.

Tick all of the following that apply to delta connection:

a)

VL = Vp

b)

VL = 3\sqrt{3} x Vp

c)

IL = Ip

d)

IL = 3\sqrt{3} x Ip

12.

Tick all that apply for a star connection of 3 phase transformers.

a)

VL = Vp

b)

VL = 3\sqrt{3} x Vp

c)

IL = Ip

d)

IL = 3\sqrt{3} x Ip

13.

In which configuration do we use Vp = VL3\frac{VL}{\sqrt{3}}  to find the phase voltage?

a)

star

b)

delta

14.

HOW WILL YOU REDUCE CORE LOSS IN THE TRANSFORMER?

a)

By using silicon steel

b)

By reducing the size of winding

c)

By increasing the size of the winding

15.

WHICH IS VARIABLE LOSS IN THE TRANSFORMER?

a)

CORE LOSS

b)

COPPER LOSS

c)

STARY LOSS

16.

HOW WILL YOU REDUCE THE HYSTERESIS LOSS?

a)

By increasing the size of the winding

b)

By reducing the size of the winding

c)

By using thin silicon steel

17.

CORE LOSS IS A COMBINATION OF ------- AND ------ LOSSES OF TRANSFORMER.

a)

EDDY CURRENT LOSS

b)

HYSTERESIS LOSS

c)

COPPER LOSS

d)

DIELECTRIC LOSS

18.

DIFFERENCE BETWEEN INPUT POWER TO OUTPUT POWER IS KNOWN AS ---------------

a)

GAIN

b)

LOSS

c)

CORE LOSS

d)

COPPER LOSS

19.

The transformer which is more feasible to use in the distribution ends should be ___________

a)

star-delta

b)

delta-star

c)

scott

d)

delta-delta

20.

Which coil has the maximum flux in it?

a)

A

b)

B

c)

C

d)

All are equal

21.

Magnetic flux is measured in

a)

teslas

b)

coulombs

c)

webers

d)

farads

22.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
23.

If you break a bar magnet in half, each half...

a)

contains one magnetic pole.

b)

becomes a bar magnet with two poles.

c)

becomes unmagnetized.

d)

is only temporarily magnetized.

24.

Example for dia-magnetic materials

a)

(a) super conductors

b)

(b) alkali metals

c)

(c) transition metals

d)

(d) Ferrites

25.

If a transformer reduces voltage, it is called a....................... transformer.

a)

step left

b)

step right

c)

step up

d)

step down

26.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

27.

Which of the following does not change in a transformer?

a)

Voltage

b)

Current

c)

Power

d)

Frequency

28.

This picture is an example of a ________________.

a)

Motor

b)

Generator

c)

Step-up transformer

d)

Step-down transformer

29.

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

a)

480V

b)

30V

c)

20V

d)

450V

30.

Transformer works on which of the following principle

a)

Lenz’s Law

b)

Ampere's Law

c)

Faraday's Law of Electromagenetic Induction

d)

Fleming's Law

31.

What is the meaning of transformer?

a)

Optimus Prime

b)

A device that transfers electrical energy from one circuit to another

c)

Autobots

d)

Megatron

32.

If a transformer increases voltage, it is called a ......... transformer.

a)

step right

b)

step left

c)

step up

d)

step down

33.

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

a)

primary

b)

secondary

c)

tertiary

34.

Electrical symbol of a TRANSFORMER

a)
b)
c)
35.
Electromagnetic induction is change in ___________________. 
a)
surface area
b)
magnetic poles
c)
magnetic flux
36.
Voltage can be induced in a wire by
a)
a. moving the wire near a magnet.
b)
b. moving a magnet near the wire.
c)
c. changing the current in a nearby wire.
d)
d. all of these
37.

Which activity will produce the highest current?

a)

Move the magnet bar into the coil while the coil remains stationery

b)

Move the coil into the magnet bar while the magnet remains stationery

c)

Move the coil and magnet towards each other

d)

Move the coil and magnet away from each other

38.

Which action will increase the deflection of the galvanometer pointer?

a)

The magnetic pole is reversed

b)

The number of turns of coils is increased

c)

The coil is made from insulated wire

d)

The magnet is slowly pushed into the coil

39.
The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?
a)
Flip the magnet around so the North pole is facing out
b)
Move the magnet back and forth
c)
Take the magnet out
d)
Add more coils around the paper cylinder
40.

The production of electric current by a changing magnetic field is called ____________________________________.

a)

induced current

b)

electromotive force

c)

electromagnetic induction

d)

internal resistance

41.

Faraday’s Law states that the magnitude of the induced e.m.f. is _________________ to the rate of change of magnetic flux linkage with the solenoid.

a)

equal

b)

inversely proportional

c)

directly proportional

42.
If you wrap more coils around an electromagnet, it will become...
a)
brighter
b)
stronger
c)
weaker
d)
invisible
43.
What is the device seen here?
a)
generator
b)
electric motor
c)
electromagnet
d)
magnet
44.

What type of current is used?

a)

Direct

b)

Alternating

45.

An (a)   is a type of magnet in which the magnetic field is produced by an electric current

46.

Non Magnetic Material is ____________________

a)

Cobalt

b)

Nickel

c)

Iron

d)

Aluminum

47.

If you cut a bar magnet in half, it forms ______ poles

a)

2 poles

b)

4 poles

c)

8 poles

d)

6 poles

48.

The North end of the freely suspended magnet points towards?

a)

Geographical West

b)

Geographical East

c)

Geographical North

d)

Geographical South

49.

Like poles _____________each other, while unlike poles_______ each other.

(a)  

50.

(a)   magnets retain their properties only for a short period of time.

51.

The area around a magnet is called the .....

a)

attraction zone

b)

work area

c)

magnetic field

d)

hot zone

52.
Are the magnetic field lines in the picture correct?
a)
Yes, because they point from north to south.
b)
No, because they point from north to south (they're supposed to go the other way).
c)
Yes, because the North pole is on the left in all pictures.
d)
No, because the North pole is on the left in all pictures (it's supposed to be on the right).
53.

The earth is like a magnet because:

a)

It has a magnetic field due to its core

b)

it has a magnetic field do to its crust

c)

There is a magnetic pole in the earth's core

d)

Gravity generates a magnetic field

54.

You can increase the strength of an electromagnet by:

a)

Decreasing the battery charge

b)

Decreasing the amount of loops in the solenoid

c)

Winding the coils more closely

d)

Winding the coils more loosely

55.

DC MOTOR CONVERTS ------- ENERGY INTO ----------ENERGY

a)

MECHANICAL, ELECTRICAL

b)

ELECTRICAL, MECHANICAL

c)

KINETIC, POTENTIAL

56.

WHICH DEVICE IS CONSTRUCTION-WISE THE SAME AS DC MOTOR?

a)

DC GENERATOR

b)

TRANSFORMER

c)

INDUCTOR

57.

AS PER FLEMING'S LEFT-HAND RULE THUMB FINGER SHOWS THE

a)

DIRECTION OF MAGNETIC FIELD

b)

DIRECTION OF CURRENT

c)

DIRECTION OF FORCE

58.

AS PER FLEMING'S LEFT-HAND RULE INDEX FINGER SHOWS THE

a)

DIRECTION OF FORCE

b)

DIRECTION OF MAGNETIC FIELD

c)

DIRECTION OF CURRENT

59.

AS PER FLEMING'S LEFT-HAND RULE MIDDLE FINGER SHOWS THE---------

a)

DIRECTION OF FORCE

b)

DIRECTION OF MAGNETIC FIELD

c)

DIRECTION OF CURRENT

60.

WHAT IS TORQUE?

a)

TWISTING FORCE

b)

KINETIC FORCE

c)

MAGNETIC FORCE

61.

GENERATOR CONVERTS ------ ENERGY INTO ----- ENERGY

a)

MECHANICAL, ELECTRICAL

b)

ELECTRICAL, MECHANICAL

c)

POTENTIAL,KINETIC

62.

The part of an electric motor that doesn't spin is called the...

a)

armature

b)

commutator

c)

stator

d)

bearings

63.

In the image shown, the dark grey shapes are called:

a)

Brushes

b)

Armatures

c)

Commutators

d)

Windings

64.

Operating principle of DC motor formula.

a)

F=V/R

b)

F=VR

c)

F=IV

d)

F=BiL

65.

The rotor is the name of the part that is

a)

the rotating coil inside the stator's field

b)

the stationary magnets around the rotating coil

c)

the spring loaded parts that contact the commutator

d)

the split ring that carries electricity to the coil

66.

The brushes in an electric motor

a)

the split rings that rotate in a motor

b)

the coil that create the electromagnetic field

c)

Are spring loaded connectors that carry electricity to the rotor by brushing against the commutator as it rotates

d)

the magnets surrounding the rotor

67.

The AC motor consists of two main parts:

a)

the rotor and the stator.

b)

fan blades and wiring cover

c)

cylinder and piston

d)

center differential and cardan shaft

68.

The difference between the synchronous speed and actual motor (Rotor) speed is called ………..?

a)

A- Skew angle.

b)

A- Phase Shifting.

c)

A- Slip.

d)

A- Speed switch.

69.

The centrifugal switch connects with ………...

a)

Run windings.

b)

Start windings.

c)

Both start and run windings.

d)

Capacitor unit.

70.

WHAT IS BACK EMF?

a)

THE VOLTAGE OPPOSES THE SUPPLY VOLTAGE

b)

THE VOLTAGE DOES NOT OPPOSE THE SUPPLY VOLTAGE

c)

SUPPLY VOLTAGE

71.

BACK EMF OF DC MOTOR IS----------

a)

Eb = PΦNZ / 60A

b)

EB = PΦN / 60AZ

c)

EB = PΦZ / 120AN

72.

Speed of d.c. shunt motors are controlled by

a)

a. Flux control method

b)

b. Rheostatic control method

c)

c. Voltage control method

d)

d. All of these

73.

How does a Stepper Motor move ?

a)

A. Electrical Pulse

b)

B. Continuous Applied Voltage

c)

C. Alternates from A and B

74.

Two of the following are the general types of DC generators. (Check two)

a)

Asynchronous

b)

Self Excited

c)

Separately Excited

d)

Synchronous

e)

Differential Compound

75.

It is the component of the generator that has the voltage (EMF) induced into it.

a)

commutator

b)

armature

c)

prime mover

d)

rotor

Similar Resources on Wayground

Crystal Clear Tax Test

71 questions

Crystal Clear Tax Test

quiz

Worksheet

•

Professional Development

A320 SYSTEMS TEST

79 questions

A320 SYSTEMS TEST

quiz

Worksheet

•

University - Professi...

Yoga and PE

70 questions

Yoga and PE

quiz

Worksheet

•

Professional Development

G&D Summative 1

75 questions

G&D Summative 1

quiz

Worksheet

•

University - Professi...

All about EDUREFORM-Quiz for Rashmi

75 questions

All about EDUREFORM-Quiz for Rashmi

quiz

Worksheet

•

Professional Development

Odoo 15 Cert - Accounting + Invoicing (2)

71 questions

Odoo 15 Cert - Accounting + Invoicing (2)

quiz

Worksheet

•

Professional Development

Aftersales

70 questions

Aftersales

quiz

Worksheet

•

Professional Development