1. . Speed of d.c. shunt motors are controlled by
(A) Flux control method
(B) All of these
(C) Voltage control method
(D) Rheostatic control method
2. . With the increase in temperature, the speed of series and shunt motor will
(A) Decrease, decrease
(B) Decrease, increase
(C) Increase, increase
(D) Increase, decrease
3. . Which method is suitable for the speed control, below and above the normal rated speed of d.c. shunt motor?
(A) Voltage control method
(B) Rheostatic control method
(C) Flux control method
(D) All of these
4. . The PWM control of DC motor varies _________
(A) parabolically with speed
(B) inversely with speed
(C) linearly with speed
(D) exponentially with speed
5. . Small DC motors have best speed control by _________
(A) armature voltage control
(B) field resistance control
(C) any of the methods
(D) none of the mentioned
6. . The frame of an induction motor is usually made of
(A) Cast iron
(B) Silicon steel
(C) Aluminum
(D) Bronze
7. . In a three phase, delta connection ——-
(A) Line voltage is equal to phase voltage
(B) Line current is equal to phase current
(C) None of the above
(D) Line voltage and line current is zero
8. . In a three phase AC circuit, power is measured using a Wattmeter.
(A) False
(B) True
9. . The speed of a which type of DC motor is practically constant
(A) Shunt DC Motor
(B) Differentially compounded DC Motor
(C) Cumulatively compounded DC Motor
(D) Series DC Motor
10. . The speed of DC motor is:
(A) Inversely proportional to applied voltage
(B) Directly proportional to flux per pole
(C) Inversely proportional to flux per pole
(D) None of these