1.
1 . 1. At starting , the current through the starting winding of single phase induction motor
A ) lags V by 90 degree
B ) leads V by 90 degree
C ) is nearly in phase with V
D ) leads V by 75 degree
correct answer C ) is nearly in phase with V
ssc je 2014
correct answer C ) is nearly in phase with V
ssc je 2014
2 . If the excitation of an alternator operating in parallel with other alternator is increased above the normal value of excitation its
A )power factor becomes more lagging
B ) power factor becomes more leading
C ) output current decreases
D ) output KW decreases
correct answer A )power factor becomes more lagging
correct answer A )power factor becomes more lagging
ssc je 2014
3 . In an alternator , the effect of armature reaction is minimum at power factor of
A ) 0.5 lagging
B ) 0.866 lagging
C ) 0.866 leading
D ) unity
correct answer D ) unity
correct answer D ) unity
ssc je 2014
4 . Turbo alternators have rotors of
A )small diameter and long axial length
B ) large diameter and long axial length
C )large diameter and small axial length
D ) small diameter and small axial length
correct answer A )small diameter and long axial length
ssc je 2014
5 .Which of the following equipments is used to limit short – circuit current level in a substation ?
A ) isolator
B ) lighting switch
C ) coupling capacitor
D ) series reactorcorrect answer D ) series reactor
ssc je 2014
6 . Power distribution by cable is generally adopted for line length
A ) less than 10 Km
B ) above 10 Km
C ) less than 50 Km
D ) above 50 Km
coeerct answer A ) less than 10 Km
ssc je 2014
coeerct answer A ) less than 10 Km
ssc je 2014
7 . The leakage resistance of a 50 Km long cable is 1 Megaohms. For a 100 Km long cable it will be
A ) 0.5 Megaohms
B ) 2 Megaohms
C )0.66 Megaohms
D ) none of these
correct answer A ) 0.5 Megaohms
ssc je 2014
correct answer A ) 0.5 Megaohms
ssc je 2014
8. If voltage is increased by ‘ n ‘ times , the size of the conductor would
A ) increase by n times
B ) reduce by 1/n
C ) increase by n2
D ) reduce by 1/n2
correct answer D ) reduce by 1/n2
ssc je 2014
correct answer D ) reduce by 1/n2
ssc je 2014
9. The maximum demand of a consumer is 2 Kw and his daily energy consumption is 24 units . his load factor is ……………. % .
A ) 24
B ) 41.6
C ) 50
D ) 80
correct answer C ) 50
ssc je 2014
correct answer C ) 50
ssc je 2014
10 . A synchronous motor can be used as synchronous condenser when it is
A ) over excited
B ) over loaded
C ) under excited
D )under loaded
correct answer A ) over excited
ssc je 2014
correct answer A )small diameter and long axial length
ssc je 2014
correct answer D ) series reactor
ssc je 2014
correct answer A ) over excited
ssc je 2014
1 . 1. At starting , the current through the starting winding of single phase induction motor
A ) lags V by 90 degree
B ) leads V by 90 degree
C ) is nearly in phase with V
D ) leads V by 75 degree
correct answer C ) is nearly in phase with V
ssc je 2014
correct answer C ) is nearly in phase with V
ssc je 2014
2 . If the excitation of an alternator operating in parallel with other alternator is increased above the normal value of excitation its
A )power factor becomes more lagging
B ) power factor becomes more leading
C ) output current decreases
D ) output KW decreases
correct answer A )power factor becomes more lagging
correct answer A )power factor becomes more lagging
ssc je 2014
3 . In an alternator , the effect of armature reaction is minimum at power factor of
A ) 0.5 lagging
B ) 0.866 lagging
C ) 0.866 leading
D ) unity
correct answer D ) unity
correct answer D ) unity
ssc je 2014
4 . Turbo alternators have rotors of
A )small diameter and long axial length
B ) large diameter and long axial length
C )large diameter and small axial length
D ) small diameter and small axial length
correct answer A )small diameter and long axial length
ssc je 2014
5 .Which of the following equipments is used to limit short – circuit current level in a substation ?
A ) isolator
B ) lighting switch
C ) coupling capacitor
D ) series reactorcorrect answer D ) series reactor
ssc je 2014
6 . Power distribution by cable is generally adopted for line length
A ) less than 10 Km
B ) above 10 Km
C ) less than 50 Km
D ) above 50 Km
coeerct answer A ) less than 10 Km
ssc je 2014
coeerct answer A ) less than 10 Km
ssc je 2014
7 . The leakage resistance of a 50 Km long cable is 1 Megaohms. For a 100 Km long cable it will be
A ) 0.5 Megaohms
B ) 2 Megaohms
C )0.66 Megaohms
D ) none of these
correct answer A ) 0.5 Megaohms
ssc je 2014
correct answer A ) 0.5 Megaohms
ssc je 2014
8. If voltage is increased by ‘ n ‘ times , the size of the conductor would
A ) increase by n times
B ) reduce by 1/n
C ) increase by n2
D ) reduce by 1/n2
correct answer D ) reduce by 1/n2
ssc je 2014
correct answer D ) reduce by 1/n2
ssc je 2014
9. The maximum demand of a consumer is 2 Kw and his daily energy consumption is 24 units . his load factor is ……………. % .
A ) 24
B ) 41.6
C ) 50
D ) 80
correct answer C ) 50
ssc je 2014
correct answer C ) 50
ssc je 2014
10 . A synchronous motor can be used as synchronous condenser when it is
A ) over excited
B ) over loaded
C ) under excited
D )under loaded
correct answer A ) over excited
ssc je 2014
correct answer A ) over excited
ssc je 2014
11 .The material to be used in the manufacture of a standard resistor should be of
A ) low resistivity
B ) high resistivity and low temperature coefficient
C ) high temperature coefficient
D ) low resistivity and high temperature coefficient
2. 12 . In a 3-phase induction motor crawling happen at
A ) any speed
B ) no load speed
C ) odd multiples of fundamental
D ) even multiples of fundamental
3. 1 3 .A 4 pole , 3- phase induction motor run at 1440 rpm on a 50 Hz supply. Find the slip speed
A ) 2940 rpm
B ) 1500 rpm
C ) 1440 rpm
D ) 60 rpm
4. 1 4. .Low voltage windings are placed nearer to the core in the case of concentric windings because
A )it reduces hysteresis loss
B ) it reduces eddy current loss
C ) it reduces insulation requirement
D ) it reduces leakage fluxes
5. 1 5.If k is the phase to phase voltage ratio , then the line to line voltage ratio in a 3 -phase star-delta transformer is
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