HPCL/IOCL/BPCL Engineering Assistant Sample Paper – For Electrical Engineering

1. State the range of generation voltage.
(a) Between 400 KV and 700 KV
(b) Between 11 KV and 33 KV
(c) Between 132 KV and 400 KV
(d) None of the above

2. Choose which of the following option falls true for hysteresis motor.
(a) Needs Dc excitation
(b) Is not a self ? starting motor
(c) Is a constant speed motor
(d) Cannot be run in reverse speed

3. Which heating method is independent of supply frequency?
(a) Dielectric heating
(b) Electric arc heating
(c) Induction heating
(d) Electric resistance heating

4. What is the maximum torque in a 3 phase induction motor?
(a) Does not depend on rotor resistance
(b) Is proportional to rotor resistance
(c) None of the above

5. What is the power factor of a squirrel cage induction motor?
(a) Low at heavy load only
(b) Low at light load only
(c) Low at light and heavy load only
(d) Low at rated load only

6. Choose the correct option for identifying the two windings of a transformer?
(a) Not linked at all
(b) Conductively linked
(c) Electrically linked
(d) Inductively linked

7. Fill in the blanks
In a stepper motor the angular displacement ___
(a) It cannot be used for positioning of work tables and tools in NC machine
(b) Can be precisely controlled
(c) It cannot be readily interfaced with micro – computer based controller
(d) The angular displacement cannot be precisely controlled

8. The purpose of inducing emf in the primary of a transformer _________
(a) Leads the flux by 90 degree
(b) Lags behind the flux by 90 degree
(c) Is in phase with the flux
(d) Is in phase opposition to that of flux

9. Which motor will you choose which can operate in both lagging as well as leading power factors?
(a) Synchronous motor
(b) Squirrel cage motor
(c) DC shunt motor
(d) Wound rotor induction motor

10. What will be the voltage regulation of a full load and 0.80 power factor lagging load transformer when a two winding single phase transformer has a voltage regulation of 4.5% at full load and unity power factor?
(a) 4.5% or more
(b) Less that 4.5%
(c) 4.5%
(d) More than 4.5 %