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19EE2151 CT U5 REVISION

Total questions: 25

Worksheet time: 13mins

Name
Class
Date
1.
A polyphase system is generated by______
a)
Having two or more generator windings separated by equal electrical angle.
b)
Having generator windings at equal distances
c)
Having generator windings not equal distances
d)
None of the options are correct
2.

In a three phase AC circuit, the sum of all three generated voltages is _______

a)

Infinite (∞)

b)

Zero (0)

c)

One (1)

d)

All the options are correct

3.

For a star connected three phase AC circuit is

a)

Phase voltage is equal to line voltage and phase current is three times the line current

b)

Phase voltage is square root three times line voltage and phase current is equal to line current

c)

Phase voltage is equal to line voltage and line current is equal to phase current

d)

None of the options are correct

4.
In a three phase circuit, delta connection is
a)
Line voltage is equal to phase voltage
b)
Line voltage and line current is zero
c)
Line voltage and line current are Equal
d)
None of the options are correct
5.

In a balanced three-phase system-delta load, if we assume the line voltage is VRY = V∠0⁰ as a reference phasor. Then the source voltage VYB is?

a)

V∠180⁰

b)

V∠120⁰

c)

V∠-180⁰

d)

V∠-120⁰

6.

In a balanced three-phase system-delta load, if we assume the line voltage is VRY = V∠0⁰ as a reference phasor. Then the source voltage VBR is?

a)

V∠-180⁰

b)

V∠240⁰

c)

V∠-240⁰

d)

None of the options are correct

7.

In a delta-connected load, the relation between line voltage and the phase voltage is?

a)

line voltage > phase voltage

b)

line voltage = phase voltage

c)

line voltage < phase voltage

d)

All the options are correct

8.
In a balanced three-phase load, each phase has
a)
An equal amount of power
b)
Unequal amount of power
c)
Two-thirds of total power
d)
None of the options are correct
9.

In a three-phase system, the voltages are separated by

a)

45°

b)

120°

c)

180°

d)

All the options are correct

10.
In a three-phase system, where the three voltage sources are, connected to feed a three-phase load, the phase sequence is important for rotating machinery, because the:
a)
direction of rotation will be affected
b)
power factor will be leading instead of lagging
c)
Magnitude of current flow will increase
d)
None of the options are correct
11.

One method of forming a three-phase system is to connect the three similar ends of the windings together at one point. This type of connection is

a)

parallel connection

b)

Seriesl connection

c)

Delta Connection

d)

Star connection

12.
If P is the power of a star connected system then what will be power of an equivalent delta connected system?
a)
P
b)
3P
c)
P/3
d)
All the options are correct
13.

Which of the followings is/are active element?

a)

Voltage Source

b)

Current Source

c)

Both Voltage Source and Current Source are correct

d)

None of the options are correct

14.

For symmetrical wave form average value of one full cycle is

a)

1

b)

1.11

c)

2.22

d)

0

15.

The alternative names for active power is/are

a)

True Power

b)

Average Power

c)

Real Power

d)

All the options are correct

16.

In series R, L series circuit power factor can be determined as

a)

RZ

b)

R/Z

c)

Z/R

d)

None of the options are correct

17.

What is apparent power in AC operation?

a)

Product of voltage and current

b)

Product of rms voltage and rms current

c)

Product of voltage and current at no load.

d)

All the options are correct

18.

What is the real power in AC operation?

a)

VIcosφ

b)

Apparant power × cosφ

c)

Both VIcosφ and Apparant power × cosφ are correct

d)

All the options are correct

19.
Four bulbs of 40 W each are connected in series with a battery across them, which of the following statement is true?
a)
The current through each bulb is same
b)
The voltage across each bulb is not same
c)
The power dissipation in each bulb is not same
d)
None of the options are correct
20.

What is the reactive power in AC operation?

a)

Real power × sinθ

b)

Apparent power × sinθ.

c)

Real power × cosθ

d)

Apparent power × cosθ

21.

Power factor can be defined as

a)

cosine of angle between voltage and current

b)

ratio of resistance versus impedance

c)

ratio of active power to apparent power

d)

All the options are correct

22.
Efficiency of electrical machines should be calculated by
a)
Output / Input
b)
Input / Output
c)
Losses
d)
Temperature
23.

In a delta network each element has value R. The value of each element in equivalent star network will be

a)

R / 6

b)

R / 4

c)

R / 2

d)

R / 3

24.

A 3 – φ delta connected symmetrical load consumes P Watts of power from a balanced supply. If the same load is connected in star to the same supply then what is the power consumption?

a)

P/3

b)

3P

c)

√3P.

d)

P

25.

Power in a Three Phase Circuit is

a)

P = 3 VPh IPh CosФ

b)

P = √3 VL IL CosФ

c)

Both P = 3 VPh IPh CosФ and P = √3 VL IL CosФ are correct

d)

None of the options are correct

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