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Code : 12555 Question Booklet No.
533366
Max. Marks: 100 Question Paper Code: iB
Q.P. BOOKLET (ELL)
Hall Ticket No. OMR Answer Sheet No.
Name of the Candidate
Date of Examination
Signature of the Candidate
Signature of the Invigilator
Read the following instructions carefully before answering the questions.
The Question Paper Booklet consist of 20 pages including Cover Sheet.
This Booklet consist of 100 multiple choice objective lype questions to be answered in 120
minutes. Each Question carries one mark. There are no negative marks for wrong answers,
Verify your Question Paper Booklet carefully for the pages and questions. If any discrepancy
is found, ask the Invigilator to replace it with the new one.
Fill in the required particulars on the Question Paper Booklet with Blue / Black pen only.
Before answering the questions on the OMR Answer Sheet, read the instructions printed on
the OMR sheet carefully.
‘Answer all the questions on the OMR Answer Sheet using only HB Pencil.
Calculators, Pagers. Mobile Phones, etc... are not allowed inlo the Examination Hall.
Rough work is to be done in the space provided for the purpose In the Question Paper
Booklet only.
Handle OMR Answer Sheet carefully and do not fold or tamper with it.
No part of the Question Paper Booklet should bo detached under any circumstances.
‘The Question Paper Booklet and OMR Answer Sheet shauld be handed over to the Invigllator
before leaving the Examination Hall. ROUGH WORK QUESTIONS B
1 Tfan induction machine is run at above synchronous speed, it
A) Actsasa synchronous motor
B) Actsasan induction generator
C) Acts as an induction motor
D) Would get damaged
2. Thelow voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz
supply. In order to keep the magnetization current at the same level as thal for normal 50 Hz supply,
at 25 Hz the supply voltage should be
A)230V B)1ISV ©) 460V D)65V
3. Asingle-phase transformer has a tums ratio of 1:2 and is connected to a purely resistive load as
shown in the figure. The magnetizing current drawn is 1A, and the secondary current is 1A. Ifcore
losses and leakage reactances are neglected, the primary current is
ed
A)L4IA B)2A ©)2.24A D)3A
4. A separately excited d.c. machine is coupled to a SO Hz, three-phase, 4-pole induction machine as
shown in the figure. The demachineis energized first and themachines rotate at 1600 rpm. Subsequently
theinduction machine is also connected to a 50 Hz, three phase source, the phase sequence being,
consistent with the direction of rotation, In steady state
TOIOSOEE
Induction Machine 50 Hz
DC Machine 4 pole, 50 Hz Balanced three
phase supply
A) Both machines act as generators
B) DC machine acts as generator and induction machine acts as motor
C) DC machine acts as a motor and the induction machine acts as a generator
D) Both machines act as motors
