UPPCL-JE Recruitment 2017 Quiz 7

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Question 1

The speed regulation of a synchronous motor is always

• Apositive
• Bzero
• Cnegative
• D100%

Question 2

While staring a synchronous motor, its field winding should be

• Akept open
• Bshort-circuited
• Cconnected to a d.c. source
• Dnone of the above

Question 3

A synchronous condenser (or capacitor) means

• Asynchronous motor operating at full-load
• Bover-excited synchronous motor 
• Cunder-excited synchronous motor
• Dnone of the above

Question 4

The synchronous reactance of an alternator is generally ………….. armature resistance.

• A5 times smaller than
• B5 times greater than
• C10 to 100 times greater than
• D10 times smaller than

Question 5

A 3-phase alternator has 3-slots per pole. The distribution factor of the winding is ……………….. .

• A0.866
• B0.5
• C1
• Dnone of the above

Question 6

A Y-connected alternator is adjusted to its rated line-to-line voltage of 230 V while under its rated load and at 80% lagging power factor. The alternator has a rated voltage of 100% while carrying an 80% lagging power factor load at 100% current. If its no-load voltage is 142.8% of rated voltage, the voltage regulation of the alternator is

• A32.7%
• B13.9%
• C42.8%
• D27.6%

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