Diploma electrical engineers Recruitment Exam question papers with answers pdf
Question No #1. The torque developed by a 3-phase induction motor least depends on
(a) rotor current(b) rotor power factor
(c) rotor e.m.f.
(d) shaft diameter
Ans: d
Question No #2. In a star-delta starter of an induction motor
(a) resistance is inserted in the stator
(b) reduced voltage is applied to the stator
(c) resistance is inserted in the rotor
(d) applied voltage per1 stator phase is 57.7% of the line voltage
Ans: d
Question No #3. The torque of an induction motor is
(a) directly proportional to slip
(b) inversely proportional to slip
(c) proportional to the square of the slip
(a) resistance is inserted in the stator
(b) reduced voltage is applied to the stator
(c) resistance is inserted in the rotor
(d) applied voltage per1 stator phase is 57.7% of the line voltage
Ans: d
Question No #3. The torque of an induction motor is
(a) directly proportional to slip
(b) inversely proportional to slip
(c) proportional to the square of the slip
(d) none of the above
Ans: a
Ans: a
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(a) the power factor will be low
(b) windage losses will be more
(c) bearing friction will reduce
(d) copper loss will reduce In an induction motor
Ans: a
Question No #5. Insertion of reactance in the rotor circuit
(a) reduces starting torque as well as maximum torque
(b) increases starting torque as well as maximum torque
(c) increases starting torque but maxi-mum torque remains unchanged
(d) increases starting torque but maxi-mum torque decreases
(a) reduces starting torque as well as maximum torque
(b) increases starting torque as well as maximum torque
(c) increases starting torque but maxi-mum torque remains unchanged
(d) increases starting torque but maxi-mum torque decreases
Ans: a
Question No #6. Insertion of resistance in the rotcir of an induction motor to develop a given torque
(a) decreases the rotor current
(b) increases the rotor current
(c) rotor current becomes zero
(d) rotor current rernains same
Ans: d
Question No #7. In a capacitor start and run motors the function of the running capacitor in series with
the auxiliary winding is to
(a) improve power factor
(b) increase overload capacity
(c) reduce fluctuations in torque
(d) to improve torque
Ans: a
Question No #8. In a capacitor start motor, the phase displacement between starting and running
winding can be nearly
(a) 10°
(b) 30°
(c) 60°
(d) 90°
Ans: d
the auxiliary winding is to
(a) improve power factor
(b) increase overload capacity
(c) reduce fluctuations in torque
(d) to improve torque
Ans: a
Question No #8. In a capacitor start motor, the phase displacement between starting and running
winding can be nearly
(a) 10°
(b) 30°
(c) 60°
(d) 90°
Ans: d
Question No #9. Current velocity through a copper conductor is
(a) the same as propagation velocity of electric energy
(b) independent of current strength
(c) of the order of a few ^.s/m
(d) nearly 3 x 108 m/s
Ans: c
Question No #10. You have to replace 1500 Q resistor in radio. You
have no 1500 Q resistor but have several 1000 Q ones
which you would connect
(a) two in parallel
(b) two in parallel and one in series
(c) three in parallel
(d) three in series
Ans: b
(a) the same as propagation velocity of electric energy
(b) independent of current strength
(c) of the order of a few ^.s/m
(d) nearly 3 x 108 m/s
Ans: c
Question No #10. You have to replace 1500 Q resistor in radio. You
have no 1500 Q resistor but have several 1000 Q ones
which you would connect
(a) two in parallel
(b) two in parallel and one in series
(c) three in parallel
(d) three in series
Ans: b
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