Free Printable End semester Practical exam 19EE3002

Worksheets

End semester Practical exam 19EE3002

Total questions: 15

Worksheet time: 8mins

Name

Class

Date

A D.C. series motor is that which

has its field winding consisting of thick wire and less turns

has a poor torque

can be started easily without load

has almost constant speed

A three point starter is considered suitable for

shunt motors

shunt as well as compound motors

shunt, compound and series motors

all D.C. motors

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

Frame

Shaft

Commutator

Stator

D.C. shunt motors are used for driving

trains

cranes

hoists

machine tools

For a D.C. shunt motor if the excitation is changed

torque will remain constant

torque will change but power will remain constant

torque and power both will change

torque, power and speed, all will change

For starting a D.C. motor a starter is required because

it limits the speed of the motor

it limits the starting current to a safe value

it starts the motor

none of the above

If a D.C. motor is connected across the AC supply it will

run at normal speed

not run

run at lower speed

burn due to heat produced in the field winding by .eddy currents

If the field of a D.C. shunt motor gets opened while motor is running

the speed of motor will be reduced %

the armature current will reduce

the motor will attain dangerously high speed 1

the motor will continue to nuvat constant speed

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

step left

step right

step up

step down

10.

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

A.C current produces changing magnetic field.

D.C current produces changing magnetic field.

D.C current is weak

A.C current is powerful

11.

Transformer works on which of the following principle

Lenz’s Law

Ampere's Law

Faraday's Law of Electromagenetic Induction

Fleming's Law

12.

In order for electromagnetic induction to occur, there must be relative............between a magnetic field and a conductor.

race

Motion

field

voltage

13.

For a transformer, core losses are not equivalent to

iron loss

sum of eddy current losses and hysteresis losses

losses in series parameters

losses in shunt parameters

14.

In transformer which quantity do not remain same after transformer action at another winding end.

magnetizing flux

current

kVA

frequency

15.

Which one is not correct for auto transformer

It has better voltage regulation in resistance and reactance of the single winding is less

It has lower efficiency than two winding transformer.

Used only for slight variation of the output voltage from input voltage

It is also used as a voltage regulator

100 %

End semester Practical exam 19EE3002

Total questions: 15

Worksheet time: 8mins

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