Previous Year Papers of ONGC GT Exam

Hi I am interested in having the previous years question paper for the Graduate Trainee recruitment examination in Electrical discipline for ONGC?

the previous years question paper for the Graduate Trainee recruitment examination in Electrical discipline for ONGC is as given below:

ONGC Graduate Trainee Electrical paper

Q.1 The two windings of a transformer is

(A) conductively linked. (B) inductively linked.

(C) not linked at all. (D) electrically linked.

Ans : B

Q.2 A salient pole synchronous motor is running at no load. Its field current is

switched off. The motor will

(A) come to stop.

(B) continue to run at synchronous speed.

(C) continue to run at a speed slightly more than the synchronous speed.

(D) continue to run at a speed slightly less than the synchronous speed.

Ans: B

Q.3 The d.c. series motor should always be started with load because

(A) at no load, it will rotate at dangerously high speed.

(B) it will fail to start.

(C) it will not develop high starting torque.

(D) all are true.

Ans: A

Q.4 The frequency of the rotor current in a 3 phase 50 Hz, 4 pole induction motor

at full load speed is about

(A) 50 Hz. (B) 20 Hz.

C) 2 Hz. (D) Zero.

Ans: C

Q.5 In a stepper motor the angular displacement

(A) can be precisely controlled.

(B) it cannot be readily interfaced with micro computer based controller.

(C) the angular displacement cannot be precisely controlled.

D) it cannot be used for positioning of work tables and tools in NC machines.

Ans: A

Q.6 The power factor of a squirrel cage induction motor is

(A) low at light load only.

(B) low at heavy load only.

(C) low at light and heavy load both.

(D) low at rated load only.

Ans: A

Q.7 The generation voltage is usually

(A) between 11 KV and 33 KV. (B) between 132 KV and 400 KV.

(C) between 400 KV and 700 KV. (D) None of the above.

Ans: A

Q.8 When a synchronous motor is running at synchronous speed, the damper

winding produces

(A) damping torque.

(B) eddy current torque.

(C) torque aiding the developed torque.

(D) no torque.

Ans: D

Q.9 If a transformer primary is energised from a square wave voltage source, its

output voltage will be

(A) A square wave. (B) A sine wave.

(C) A triangular wave. (D) A pulse wave.

Ans: A

Q.10 In a d.c. series motor the electromagnetic torque developed is proportional to

(A) Ia (B) 2Ia .

(C)Ia1 (D)2Ia1

Ans: B

Q.11 In a 3 – phase induction motor running at slip ‘s’ the mechanical power

developed in terms of air gap power Pg is

(A) ( s −1) Pg . (B) (1 -s)Pg .

(C) ( 1− s) Pg . (D) s × Pg .

Ans: C

Q.12 In a 3 – phase induction motor the maximum torque

(A) is proportional to rotor resistance r2 .

(B) does not depend on r2 .

(C) is proportional to r2 .

(D) is proportional to 2r2 .

Ans: B

Q.13 In a d.c. machine, the armature mmf is

(A) stationary w.r.t. armature. (B) rotating w.r.t. field.

(C) stationary w.r.t. field. (D) rotating w.r.t. brushes.

Ans: C

Q.14 In a transformer the voltage regulation will be zero when it operates at

(A) unity p.f. (B) leading p.f.

(C) lagging p.f. (D) zero p.f. leading.

Ans: B

Q.15 The maximum power in cylindrical and salient pole machines is obtained

respectively at load angles(degree) of

(A) 90 ,90 . (B) < 90 ,90 .

(C) 90 ,> 90 . (D) 90 ,< 90 .

Ans: D

Q.16 The primary winding of a 220/6 V, 50 Hz transformer is energised from 110

V, 60 Hz supply. The secondary output voltage will be

(A) 3.6 V. (B) 2.5 V.

(C) 3.0 V. (D) 6.0 V.

Ans: C

Q.17 The emf induced in the primary of a transformer

(A) is in phase with the flux. (B) lags behind the flux by 90 degree.

(C) leads the flux by 90 degree. (D) is in phase opposition to that of flux.

Ans: C

Q.18 The relative speed between the magnetic fields of stator and rotor under

steady state operation is zero for a

(A) dc machine. (B) 3 phase induction machine.

(C) synchronous machine. (D) single phase induction machine.

Ans: all options are correct

Q.19 The current from the stator of an alternator is taken out to the external load

circuit through

(A) slip rings. (B) commutator segments.

(C) solid connections. (D) carbon brushes.

Ans: C

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