• #### 1.  The modern steam turbines are

• impulse turbines
• reaction turbines
• impulse-reaction turbines
• none of the above

• 1 and 2
• 1 or 2
• 1 alone
• 2 alone
• #### 3.  A definite time relay is ___________ the amount of current:

• Dependent on
• Independent of
• #### 4.  Transmission efficiency increases as

• voltage and power factor both increase
• voltage and power factor both decrease
• voltage increases but power factor decreases
• voltage decreases but power factor increases.
• #### 5.  Which of these systems uses the 3 phase 4 wire system?

• Primary distribution
• Secondary distribution
• Primary transmission.
• Secondary transmission.
• #### 6.  Skin effect depends on

• size of the conductor
• frequency of the current
• resistivity of the conductor material
• all of the above.
• #### 7.  The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

• Zs = 0.7 pu, Zm =0.2 pu
• Zs = 0.5 pu, Zm =0.6 pu
• Zs = 0.6 pu, Zm =0.5 pu
• Zs = 0.2 pu, Zm =0.7 pu
• #### 8.  The effective resistance of a conductor will be the same as ohmic resistance when

• current is in true sine wave form
• voltage is low
• power factor is unity
• Current is uniformly distributed in the conductor cross-section.
• #### 9.  The region where the electrons and holes diffused across the junction is called ________

• Depletion Junction
• Depletion region
• Depletion space
• Depletion boundary
• #### 10.  The short circuit current of an alternator when short circuited on three phases will be

• Zero as time goes to infinity
• Maximum when time goes to infinity
• Infinity when time goes to infinity
• Small as time goes to infinity but not zero

• Egypt
• Mongolia
• Iran
• Japan
• #### 12.  The steady state stability of the power system can be improved by

• Increasing the number of parallel lines between the transmission points
• Connecting capacitors in series with the line
• Reducing the excitation of the machines
• Both a and b

• 0 A
• 33.3 A
• 66.6 A
• 100 A
• #### 14.  What are the common assumptions made for the equal area criterion?

• The transmission line and machine resistances are neglected
• Rotor speed of the machine is constant
• Mechanical input remains constant.
• All of these
• #### 15.  Which of the following statement is/are true?Zn

• The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit
• The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit
• both 1 and 2
• nether 1 nor 2

• False
• True

• true
• false
• #### 18.  At what range of speed is the electricity from the wind turbine is generated?

• 100 – 125 mph
• 450 – 650 mph
• 250 – 450 mph
• 30-35 mph
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