Govt Exams Mock Test FREE | Online Quiz Competition

Q1. The mechanical angle is________electrical angle.

always less

same

greaterthan or equal to

lesser than or equal to

Q2. A three phase alternator having synchronous reactance 0.2 \(\Omega\) is rated as 100 MVA, 11 kV. Calculate the base current and base impedance.

9.09 kA and 1.31 \(\Omega\)

5.25 kA and 1.21 \(\Omega\)

9.09 kA and 1.13 \(\Omega\)

5.25 kA and 1.12 \(\Omega\)

Q3. In a synchronous motor if the back emf generated in the armature at no load is approximately equal to the applied voltage, then

the torque generated is maximum

the excitation is said to be 100%

the excitation is said to be zero percent

the motor is said to be fully loaded.

Q4. If the full-load copper loss of a transformer is 800 W, then the copper loss at half-load is__________.

100 W

200 W

400 W

800 W

Q5. If the transformer is applied rated supply voltage with double frequency, then it's hysteresis losses will be

constant

Increased by double than rated

Reduced to half than rated

Increased by four times than

Q6. What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA?

19

28

37

23

Q7. which of the following will not prevent a self excited generator from building up to its full voltage?

open field

wrong direction of rotation

no residual magnetism

speed to high

Q8. A star connected synchronous generator rated at 500 MVA, 50 kV has a reactance of 0.5 pu. Find the ohmic value of the reactance.

2.5 \(\Omega\)

0.1 \(\Omega\)

1 \(\Omega\)

0.25 \(\Omega\)

Q9. The type of DC generator suitable for battery charging in automobiles is

DC shunt

DC differentially compound

DC cummulative compound

DC series

Q10. A 3\(\phi\)- 4 pole induction motor is supplied from 3-\(\phi\) 50 Hz AC supply. Find the rotor frequency when it runs at 600 RPM.

25 Hz

30 Hz

20 Hz

35 Hz

Quiz

Year 2024

November
Week # 2 Quiz 2

Q1. The mechanical angle is________electrical angle.

Q2. A three phase alternator having synchronous reactance 0.2 \(\Omega\) is rated as 100 MVA, 11 kV. Calculate the base current and base impedance.

Q3. In a synchronous motor if the back emf generated in the armature at no load is approximately equal to the applied voltage, then

Q4. If the full-load copper loss of a transformer is 800 W, then the copper loss at half-load is__________.

Q5. If the transformer is applied rated supply voltage with double frequency, then it's hysteresis losses will be

Q6. What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA?

Q7. which of the following will not prevent a self excited generator from building up to its full voltage?

Q8. A star connected synchronous generator rated at 500 MVA, 50 kV has a reactance of 0.5 pu. Find the ohmic value of the reactance.

Q9. The type of DC generator suitable for battery charging in automobiles is

Q10. A 3\(\phi\)- 4 pole induction motor is supplied from 3-\(\phi\) 50 Hz AC supply. Find the rotor frequency when it runs at 600 RPM.

Quiz

Year 2024

August Week # 4 Expire on 21 Sep 2024

September Week # 1 Expire on 30 Sep 2024

September Week # 2 Expire on 07 Oct 2024

September Week # 3 Expire on 14 Oct 2024

November Week # 2 Quiz 2

Q1. The mechanical angle is________electrical angle.

Q2. A three phase alternator having synchronous reactance 0.2 \(\Omega\) is rated as 100 MVA, 11 kV. Calculate the base current and base impedance.

Q3. In a synchronous motor if the back emf generated in the armature at no load is approximately equal to the applied voltage, then

Q4. If the full-load copper loss of a transformer is 800 W, then the copper loss at half-load is__________.

Q5. If the transformer is applied rated supply voltage with double frequency, then it's hysteresis losses will be

Q6. What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA?

Q7. which of the following will not prevent a self excited generator from building up to its full voltage?

Q8. A star connected synchronous generator rated at 500 MVA, 50 kV has a reactance of 0.5 pu. Find the ohmic value of the reactance.

Q9. The type of DC generator suitable for battery charging in automobiles is

Q10. A 3\(\phi\)- 4 pole induction motor is supplied from 3-\(\phi\) 50 Hz AC supply. Find the rotor frequency when it runs at 600 RPM.

Record & Track Your Performance

November
Week # 2 Quiz 2