Q.1
What is the formula for the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, δ represents rotor angle, X represents reactance)
  • a) Eb×Vt×sinδ÷X
  • b) Eb×Vt2×sinδ÷X
  • c) Eb2×Vt×sinδ÷X
  • d) Eb×Vt×sinδ÷X2
Q.2
Salient pole machines are more stable than cylindrical rotor machines.
  • a) True
  • b) False
Q.3
The unit of reactive power is VAR.
  • a) True
  • b) False
Q.4
Calculate the power factor during the resonance condition.
  • a) .58
  • b) .42
  • c) .65
  • d) 1
Q.5
Calculate the reactive power in a 5 Ω resistor.
  • a) 7 VAR
  • b) 0 VAR
  • c) 2 VAR
  • d) 1 VAR
Q.6
What is the unit of the apparent or complex power?
  • a) VAR
  • b) VA
  • c) ohm
  • d) Volt
Q.7
Calculate the value of the frequency of the DC supply.
  • a) 0 Hz
  • b) 50 Hz
  • c) 20 Hz
  • d) 10 Hz
Q.8
The slope of the V-I curve is 0°. Calculate the value of resistance. The graph is parallel to the x-axis.
  • a) 1 Ω
  • b) 1.8 Ω
  • c) 0 Ω
  • d) 2.2 Ω
Q.9
Calculate the value of the duty cycle if the system is on for 5 sec and off forsec.
  • a) .333
  • b) .444
  • c) .201
  • d) .642
0 h : 0 m : 1 s