Rotor Cu Losses MCQ Quiz in தமிழ் - Objective Question with Answer for Rotor Cu Losses - இலவச PDF ஐப் பதிவிறக்கவும்
Last updated on Mar 19, 2025
Latest Rotor Cu Losses MCQ Objective Questions
Top Rotor Cu Losses MCQ Objective Questions
Rotor Cu Losses Question 1:
A 4-pole, 50 Hz, 3 phase induction motor, delivers a shaft torque of 200 N-m at full load and running at 900 rpm. The mechanical losses account for 500 W. Then the rotor copper losses will be _______ (in KW)
Answer (Detailed Solution Below) 12.5 - 13.5
Rotor Cu Losses Question 1 Detailed Solution
P = 4, f = 50 Hz, T = 200 N-m, N = 900 rpm
Motor output power = ω × T
Rotor output = motor output + mechanical losses = 18.85 + 0.5 = 19.35 kW
Rotor Cu losses = 32.25 - 19.35 = 12.9 kW
Rotor Cu Losses Question 2:
The rotor of a 220V, 60Hz, 4 pole induction motor has power input of 80kW in observed that rotor emf makes 90 cycle per minute. Calculate the rotor copper loss in kW
Answer (Detailed Solution Below) 2
Rotor Cu Losses Question 2 Detailed Solution
Rotor Cu Losses Question 3:
A 1200 V, 6 pole, 50 Hz, 3 phase star connected induction motor has stator to rotor turns ratio of 3. At stand still its rotor impedance is (0.4 + j8) Ω /phase. What is the gross output of motor at the speed of 960 rpm in kw?
Answer (Detailed Solution Below) 9.3 - 9.5
Rotor Cu Losses Question 3 Detailed Solution
stator phase voltage
Standstill rotor emf,
Synchronous speed of motor
slip
Rotor impedance in running conditions,
Total cu loses
= 390.6 W
Now,
= 9375.84 w
= 9.37584 kw
Rotor Cu Losses Question 4:
The typical fan-out of standard TTL is
Answer (Detailed Solution Below) 10
Rotor Cu Losses Question 4 Detailed Solution
The typical fan out of TTL logic family is 10. The CMOS logic gate has the highest fan out of all the logic families.
Rotor Cu Losses Question 5:
An induction motor works with an efficiency of 92% when delivering an output of 46 kW. In these conditions, the stator cu loss is half and rotor cu loss is equal to the mechanical losses respectively. Also, the mechanical losses are one-fourth of the no-load losses. What is the value of slip in these conditions?
Answer (Detailed Solution Below)
1.532%
Rotor Cu Losses Question 5 Detailed Solution
Motor input,
Total losses
Losses are:- Stator iron loss (Si), stator copper loss (Scu), Rotor Cu loss (Rcu) and Rotor mechanical loss (Rm).
No load loss = Si + Rm = 4 Rm
Total losses = Si + Rm + SCu + RCu
Now,
Rotor input = gross output + mechanical losses + rotor cu loss
= 47.4545 kW
Slip,
=0.01532 or 1.532%