Govt Exams Mock Test FREE | Online Quiz Competition

Q1. In a 4-pole lap wounded DC machine,
\((\frac{no. \:of\:poles}{no. \:of\:brushes})\times\:\) no. of parallel paths=?

3

2

1

4

Q2. When the rotor of a 3-phase induction motor is completely blocked, the slip is equal to____________.

0

0.3

0.5

1

Q3. A 30 kVA single-phase transformer has 500 turns on the primary and 50 turns on the secondary winding. The primary is connected to 3000 V, 50 Hz supply. Find the full load primary and secondary currents. Neglect leakage drops and no-load primary current.

100 A and 10 A

1 A and 100 A

10 A and 1 A

10 A and 100 A

Q4. If full load copper loss of a transformer is 500W, the copper loss at half load is given by

100 W

125 W

150 W

200 W

Q5. During a test on 6 kVA transformer it is found that iron losses are 120 W, full load copper losses are 200. The total losses at half full load will be

80 W

160 W

320 W

170 W

Q6. For a step up transformer secondary resistance reffered to primary is

less than secondary resistance

equal to secondary resistance

more than secondary resistance

depends on transformer design

Q7. A 220 V dc motor has an armature resistance of 1 Ω. If the full load armature current is 20 A, then the induced emf is_________.

180V

200 V

220 V

240V

Q8. The number of poles of a synchronous motor is '8'. If the motor is connected to a 50 Hz AC supply, the speed of motor will be,

1500 rpm

1000 rpm

750 rpm

3000 rpm

Q9. Starting torque and maximum torque of 3 phase induction motor varies as_,respectively.

\(\frac{1}{f^3},\: \frac{1}{f^2}\)

\(\frac{1}{f^2},\: \frac{1}{f}\)

\(\frac{1}{f^2},\: \frac{1}{f^3}\)

\(\frac{1}{f},\: \frac{1}{f^2}\)

Q10. A 40 KVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is__________.

0.5

0.623

0.707

0.577

Quiz

Year 2025

February
Week # 2 Quiz 2

Q1. In a 4-pole lap wounded DC machine,
\((\frac{no. \:of\:poles}{no. \:of\:brushes})\times\:\) no. of parallel paths=?

Q2. When the rotor of a 3-phase induction motor is completely blocked, the slip is equal to____________.

Q3. A 30 kVA single-phase transformer has 500 turns on the primary and 50 turns on the secondary winding. The primary is connected to 3000 V, 50 Hz supply. Find the full load primary and secondary currents. Neglect leakage drops and no-load primary current.

Q4. If full load copper loss of a transformer is 500W, the copper loss at half load is given by

Q5. During a test on 6 kVA transformer it is found that iron losses are 120 W, full load copper losses are 200. The total losses at half full load will be

Q6. For a step up transformer secondary resistance reffered to primary is

Q7. A 220 V dc motor has an armature resistance of 1 Ω. If the full load armature current is 20 A, then the induced emf is_________.

Q8. The number of poles of a synchronous motor is '8'. If the motor is connected to a 50 Hz AC supply, the speed of motor will be,

Q9. Starting torque and maximum torque of 3 phase induction motor varies as_,respectively.

Q10. A 40 KVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is__________.

Quiz

Year 2025

February Week # 1 Expire on 28 Feb 2025

February Week # 2 Expire on 07 Mar 2025

February Week # 3 Expire on 14 Mar 2025

February Week # 4 Expire on 21 Mar 2025

February Week # 2 Quiz 2

Q1. In a 4-pole lap wounded DC machine, \((\frac{no. \:of\:poles}{no. \:of\:brushes})\times\:\) no. of parallel paths=?

Q2. When the rotor of a 3-phase induction motor is completely blocked, the slip is equal to____________.

Q3. A 30 kVA single-phase transformer has 500 turns on the primary and 50 turns on the secondary winding. The primary is connected to 3000 V, 50 Hz supply. Find the full load primary and secondary currents. Neglect leakage drops and no-load primary current.

Q4. If full load copper loss of a transformer is 500W, the copper loss at half load is given by

Q5. During a test on 6 kVA transformer it is found that iron losses are 120 W, full load copper losses are 200. The total losses at half full load will be

Q6. For a step up transformer secondary resistance reffered to primary is

Q7. A 220 V dc motor has an armature resistance of 1 Ω. If the full load armature current is 20 A, then the induced emf is_________.

Q8. The number of poles of a synchronous motor is '8'. If the motor is connected to a 50 Hz AC supply, the speed of motor will be,

Q9. Starting torque and maximum torque of 3 phase induction motor varies as_____,____respectively.

Q10. A 40 KVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is__________.

Record & Track Your Performance

February
Week # 2 Quiz 2

Q1. In a 4-pole lap wounded DC machine,
\((\frac{no. \:of\:poles}{no. \:of\:brushes})\times\:\) no. of parallel paths=?

Q9. Starting torque and maximum torque of 3 phase induction motor varies as_,respectively.