Govt Exams Mock Test FREE | Online Quiz Competition

Q1. A 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The frequency of the rotor current is

\(3H_z\)

\(2.5H_z\)

\(1H_z\)

\(2H_z\)

Q2. Bearings of DC motor may be heated up due to

incorrect voltage

poor ventilation

loose coupling

lack of or dirty lubricant

Q3. The saving in copper achieved by converting a two winding, transformer into an Auto transformer is primarily decided by,

Load on the secondary

Cross section area of the core

Transformation ratio

Material of the core

Q4. Material used for construction of transformer core is usually

wood

copper

aluminium

silicon steel

Q5. The number of sliprings on a squirrel cage induction motor is usually

two

one

four

none

Q6. Distribution transformers have good all day efficiency due to

low copper loss

low iron loss

low copper and iron loss

none of these

Q7. Hunting in a synchronous motor takes place when the

Friction in the bearings is more

Air gap is less

Load is variable

Load is constant

Q8. Three phase alternators are invariably star connected because

higher terminal voltage is obtained

less turns of wire are required

small conductors can be used

magnetic losses are minimum

Q9. An alternator is said to be over excited when it is operating at

Lagging power factor

Unity power factor

Leading power factor

Any of the these

Q10. The starting torque in case of a centrifugal pump is generally

less than the running torque

same as the running torque

slightly more than the running torque

double the running torque

Quiz

Year 2025

February
Week # 2 Quiz 3

Q1. A 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The frequency of the rotor current is

Q2. Bearings of DC motor may be heated up due to

Q3. The saving in copper achieved by converting a two winding, transformer into an Auto transformer is primarily decided by,

Q4. Material used for construction of transformer core is usually

Q5. The number of sliprings on a squirrel cage induction motor is usually

Q6. Distribution transformers have good all day efficiency due to

Q7. Hunting in a synchronous motor takes place when the

Q8. Three phase alternators are invariably star connected because

Q9. An alternator is said to be over excited when it is operating at

Q10. The starting torque in case of a centrifugal pump is generally

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 3

Q1. A 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The frequency of the rotor current is

Q2. Bearings of DC motor may be heated up due to

Q3. The saving in copper achieved by converting a two winding, transformer into an Auto transformer is primarily decided by,

Q4. Material used for construction of transformer core is usually

Q5. The number of sliprings on a squirrel cage induction motor is usually

Q6. Distribution transformers have good all day efficiency due to

Q7. Hunting in a synchronous motor takes place when the

Q8. Three phase alternators are invariably star connected because

Q9. An alternator is said to be over excited when it is operating at

Q10. The starting torque in case of a centrifugal pump is generally

Record & Track Your Performance

February
Week # 2 Quiz 3