hshsvsus
問題一覧
1
For constant transmission eficiency, voltage is increased ntimes, the size of the conductor would be
(a) reduced to (1/n2) times of the original
2
It the shunt admittance of the transmission line is ignored, the torque angle at which maximum power will occur is
pi/2
3
If the torque angle lamdna continuously increases, system will become
unstable
4
If the transmission voltage is increased, the percentage resistance drop will
decrease
5
The power transmission capacity of the transmission line is
proportional to the square of the voltage
6
Threephase short circuit current of an alternator will be
zero
7
The material used for fuse wire must have
low melting point and high specific resistance
8
Third harmonies current flowsfrom the generator terminalsthrough the system and returns by way ofcomparatively lowzero-sequence reactance path t othe neutral terminals will give rise to
overheating of generator and neutral resistors of earthing transformer
9
The effect of electric shock in the human body will depend on
(a) line voltage
(b) line current.
(c) current flowing in the body
(d) none of the above.
c
10
The class C insulation can withstand
(a) 180°C
(b) 150°C
(c) 200°C
(d) 105°C
a
11
The location of the lightning arresters is
(a) near the transformer
(b) away from the transformer
(c) near the circuit breaker
(d) away from the circuit breaker.
a
12
Which of the following distribution systemsgives the greater reliability
(a) radial system
(b) ring system
(c) DC three wire system
(d) open loop system.
b
13
In the transformers
(a) high tension winding is used near the core
(b) high tension winding is used away from the core
(c) low tension winding is used near the core
(d) low tension winding is used away from the core.
a
14
The effect of series capacitor on a transmission line is to improve the
(a) steady state stability
(b) transient stability
(c) (a) and (b) both
(d) none of the above.
a
15
The power intended to be availableeven under emergency condition is called
(a) firm power
(b) hot reserve
(c) cold reserve
(d) spinning reserve.
c
16
Two transmission lines of the surge impedance of 600 ohms each is linked by a cable.What should be the surge impedance of the cable if there were no reflection at the junction?
(a) 300 ohms
(b) 30 ohms
(c) 600 ohms
(d) 60 ohms.
c
17
For 1 KV underground system, it is possible to work upon a length of
(a) 800 miles
(b) 100 miles
(c) 400 miles
(d) 10 miles.
b
18
Series capacitors are used to
(a) improve the line voltage
(b) compensate for line inductive reactance
(c) compensate for line capacitive reactance
(d) none of the above.
b
19
The short circuit in any windings of the transformer is the result of
(a) impulse voltage
(b) insulation failure
(c) mechanical vibrations
(d) loose connection.
a
20
Split-phase relaying responds to faults between turns of a transformer
true
21
Which of the following relays are used for phase fault on long line?
impedance relays
22
Pogi ba si Cresencio
Yes
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問題一覧
1
For constant transmission eficiency, voltage is increased ntimes, the size of the conductor would be
(a) reduced to (1/n2) times of the original
2
It the shunt admittance of the transmission line is ignored, the torque angle at which maximum power will occur is
pi/2
3
If the torque angle lamdna continuously increases, system will become
unstable
4
If the transmission voltage is increased, the percentage resistance drop will
decrease
5
The power transmission capacity of the transmission line is
proportional to the square of the voltage
6
Threephase short circuit current of an alternator will be
zero
7
The material used for fuse wire must have
low melting point and high specific resistance
8
Third harmonies current flowsfrom the generator terminalsthrough the system and returns by way ofcomparatively lowzero-sequence reactance path t othe neutral terminals will give rise to
overheating of generator and neutral resistors of earthing transformer
9
The effect of electric shock in the human body will depend on
(a) line voltage
(b) line current.
(c) current flowing in the body
(d) none of the above.
c
10
The class C insulation can withstand
(a) 180°C
(b) 150°C
(c) 200°C
(d) 105°C
a
11
The location of the lightning arresters is
(a) near the transformer
(b) away from the transformer
(c) near the circuit breaker
(d) away from the circuit breaker.
a
12
Which of the following distribution systemsgives the greater reliability
(a) radial system
(b) ring system
(c) DC three wire system
(d) open loop system.
b
13
In the transformers
(a) high tension winding is used near the core
(b) high tension winding is used away from the core
(c) low tension winding is used near the core
(d) low tension winding is used away from the core.
a
14
The effect of series capacitor on a transmission line is to improve the
(a) steady state stability
(b) transient stability
(c) (a) and (b) both
(d) none of the above.
a
15
The power intended to be availableeven under emergency condition is called
(a) firm power
(b) hot reserve
(c) cold reserve
(d) spinning reserve.
c
16
Two transmission lines of the surge impedance of 600 ohms each is linked by a cable.What should be the surge impedance of the cable if there were no reflection at the junction?
(a) 300 ohms
(b) 30 ohms
(c) 600 ohms
(d) 60 ohms.
c
17
For 1 KV underground system, it is possible to work upon a length of
(a) 800 miles
(b) 100 miles
(c) 400 miles
(d) 10 miles.
b
18
Series capacitors are used to
(a) improve the line voltage
(b) compensate for line inductive reactance
(c) compensate for line capacitive reactance
(d) none of the above.
b
19
The short circuit in any windings of the transformer is the result of
(a) impulse voltage
(b) insulation failure
(c) mechanical vibrations
(d) loose connection.
a
20
Split-phase relaying responds to faults between turns of a transformer
true
21
Which of the following relays are used for phase fault on long line?
impedance relays
22
Pogi ba si Cresencio
Yes