Q1:- when is the mechanical power developed by a DC motor maximum
1. Back EMF is equal to applied voltage
2. Back EMF is equal to zero
3. Back EMF is equal to the half of applied voltage
4. None of the above
Q3:- the bridge method in transformer will
1. Check Transformer winding
2. Check windings voltages
3. Find ratio of induced voltage
4. Result in short circuit loss
ANSWER:-3
ANSWER:-2
1. Back EMF is equal to applied voltage
2. Back EMF is equal to zero
3. Back EMF is equal to the half of applied voltage
4. None of the above
ANSWER:-3
Q2:- internal characteristic of a DC generator is plotted between the
1. Field current and voltage generated no load
2. Armature current and voltage generated no load
3. Armature current and voltage generated after armature reaction
4. Field current and voltage generated on load
ANSWER:-3
Q3:- the bridge method in transformer will
1. Check Transformer winding
2. Check windings voltages
3. Find ratio of induced voltage
4. Result in short circuit loss
ANSWER:-3
Q4:- what is the effect of the field failure of salient pole synchronous motor connected with infinite bus
1. Reduce motor torque and speed
2. Not charged motor torque and speed
3. Stop the motor
4. Reduce not at work but motor will continue to run at synchronous speed
1. Reduce motor torque and speed
2. Not charged motor torque and speed
3. Stop the motor
4. Reduce not at work but motor will continue to run at synchronous speed
ANSWER:-4
Q5:- Wanger's earthing device is used in AC Bridge for
1. Shielding the bridge element
2. Eliminating the dtray electrostatic field effect
3. Eliminating the effect of earth capacitance
4. Eliminating the effect of the inter component capacitance
1. Shielding the bridge element
2. Eliminating the dtray electrostatic field effect
3. Eliminating the effect of earth capacitance
4. Eliminating the effect of the inter component capacitance
ANSWER:-2
No comments:
Post a Comment