Fundamentals of Electrical Engineering Mid - II, November - 2014

1.Compensation theorem is applicable to
  • Linear networks only
  • Non linear networks only
  • Linear and non linear networks
  • Bilateral networks
Answer: C
2.Thevenins resistance is found
  • By short circuiting the given two terminals
  • Between any two open terminals
  • By replacing voltage sources with their internal resistance
  • Between same short circuited terminals as for Vth
Answer: C
3.The field coils of DC Generator are usually made up of
  • Mica
  • Copper
  • Cast iron
  • Carbon
Answer: B
4.For a p-pole lap wound armature of a dc machine the no of parallel paths are
  • 2
  • 2P
  • P
  • P/2
Answer: C
5.The back emf of DC motor
  • Opposes the applied voltage
  • Has no effect on applied voltage
  • None of the above
  • A step up transformer increases
Answer: A
6.Favours the applied voltage
  • Voltage
  • Current
  • Power
  • Power factor
Answer: A
7.Iron losses of a transformer are measured by
  • Low power factor wattmeter
  • Untiy power factor wattmeter
  • Any type of wattmeter
  • High power factor wattmeter
Answer: A
8.Which of the following is most economical method for starting 1-Ømotor
  • capacitor start method
  • Split phase method
  • Induction start method
  • Resistance start method
Answer: A
9.Which of the folowing is an unexcited single phase synchronous motor?
  • A.C. series motor
  • Universal motor
  • Reluctance motor
  • Repulsion motor
Answer: B
10.The speed of a DC series motor at no load is
  • Zero
  • Infinity
  • High speed
  • Low speed
Answer: B
11.In AC networks, the maximum power is transferred when _________________
Answer: Complex conjugate of source impedance is equal to the load
12.The nature of current flowing in the armature of a DC generator is ______________
Answer: Alternating
13.The material used for commutator brushes are _____________
Answer: Carbon
14.Speed of a DC shunt motor can be controlled by ________________
Answer: Varying the flux
15.In lap winding the no of brushes are _________________
Answer: 2
16.If full load copper loss of a transformer is 1600W,its copper loss at half full load will be ____________
Answer: 400
17.The voltage regulation of a transformer is zero for _____________load
Answer: Capacitive
18._________________________motor is used in ceiling fans
Answer: Capacitor start
19.The speed of a synchronous motor connected to 50 Hz supply is 1000 rpm. The number of poles must be ___________________
Answer: 6
20.The advantage of repulsion motor over other single phase motors is ____________________
Answer: High efficiency